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VLOOKUP with True

When we apply the Vlookup function, it is obvious that we always look for the exact match. When we get the #N/A, we also assume that the value we are looking for is unavailable in the lookup table. But we have yet to try using Vlookup with a TRUE value match. We can use two criteria in Vlookup functions, which are TRUE and FALSE. FALSE gives us the exact match, whereas TRUE gives us the approximate match for the value if not in the lookup range. Vlookup True is used when we don’t get an exact match, but with the help of TRUE, we can get an approximate match or near value to the value which we are looking for.

Excel functions, formula, charts, formatting creating excel dashboard & others

How to Use Vlookup True?

To understand the use of Vlookup True, first, we need to understand the syntax of Vlookup. Below we have the syntax of Vlookup;

Lookup_Value = Cell value whose value we need to find.

Table_Array = Range or table from where we need to find the value of lookup_value.

Col_Index_Num = sequence number of the column from which we want to get the value.

Range_Lookup = 0 (or FALSE) for the exact match and 1 (or TRUE) for the approximate match.

We will be seeing the use of TRUE and FALSE range_lookup value and will see how Vlookup True works in the below examples.

Examples of VLOOKUP True

Lets us discuss the examples of VLOOKUP names.

You can download this VLOOKUP True Excel Template here – VLOOKUP True Excel Template

Example #1

In this example, we will see the simple way to apply Vlookup True. For this, we have a list of alphabets, as shown below. As we can see, the alphabets are in proper sequence. And in separate cells, we will be looking up the values from the list and see the output.

In cell C2, we will put any of the alphabets we want to look up from Column A. Let’s consider it D.

In cell D2, insert the vlookup function and select the lookup value and range as needed.

To get the exact match, we can select FALSE range lookup or 0 for the exact match as shown below.

Once we enter, we can see that cell D2 will have the exact match value from the selected range.

Now, if we delete the Lookup Cell value D from the list available in column A, then Vlookup will not be able to look up anything and will return #N/A.

Once we exit the syntax, we will get the value nearer to the lookup cell value D in cell D2.

As we can see, the obtained value at cell D2 is C. This is because Vlookup TRUE gives the near about value if the exact match is unavailable. Here for the D, it returned the approximate match as C because C is the only near value before D.

Example #2

In this example, we will see how Vlookup True works with a larger data set. Below is a table where the names of the different persons, ages, and physique types are mentioned from Columns A to C. And there is another small table in column E: F where we will map the value from table 1.

As we can see, we have age and physique types for each person. Now, let’s find out the physique type of any age, say 26. Insert the vlookup at cell F2 as shown below.

Select the lookup cell E2 and the Lookup range from B2 to C8, as shown below.

Now, if we randomly change the age from 26 to 53 in cell E2 and again apply the lookup using TRUE range lookup criteria and see what we will get? As of now, when we change the cell E2 value from 26 to 53, we got #N/A, as there is no value in column C available for age 53.

Now we will apply the Vlookup function using TRUE.

Once we press enter or get exited from the Vlookup syntax, our physique type in cell F2 is GENERAL, as shown below.

The reason for getting General in cell F2 is the TRUE range lookup in vlookup syntax. As we did not have the age as 53, so Vlookup True returned us the value as General because, before 53, we got general physique in cell B4.

If we again change the value, let’s say 31. Then we will get a value closer to 31 per the table. Here we have 30 in cell B2.

Pros of VLOOKUP True

It helps us get the approximate match if we do not have the exact value for the lookup cell.

It is as simple as Vlookup False.

Using this function is far better than using different IF condition functions.

Things to Remember

It gives an approximate match.

We can also use 1 in place of TRUE in the VLOOKUP syntax.

For the numerical value, It looks up the value less than the value available in the lookup cell.

Vlookup False gives the exact match, and if the match value is not available, then we will be getting #N/A

#N/A means the lookup cell’s value is not found in the entire lookup range.

The lookup range could be a table or column, but the value we will get from the column only.

Recommended Articles

This has been a guide to VLOOKUP True. Here we discuss How to Use VLOOKUP True, practical examples, and a downloadable Excel template. You can also go through our other suggested articles –

You're reading How To Use Vlookup True With Examples

## How To Use Scrapy Formrequest With Examples?

Introduction to Scrapy FormRequest

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What is Scrapy FormRequest?

Traditional scraping techniques will get a long way, but we will run across the problem of Login pages sooner or later. We may wish to scrape data, but we won’t be able to do so unless we have an account logged in.

Scrapy, by default, visits the website while “not logged in.” Fortunately, Scrapy includes the FormRequest tool, which allows us to automate login into any website if we have the necessary information.

Each site has its own set of fields, which must be found by the login procedure and watching the data flow.

How to Use Scrapy FormRequest?

A successful login is very important to developing an automated login. We can implement automated login by using scrapy FormRequest.

Web scrapping is complicated, and there is no one-size-fits-all approach that will work on all websites. Each Spider must be customized to interact with a single website. However, as explained below, the general notion and concept usually remain the same. The below steps show how to log in with FormRequestare as follows.

Examine the site’s log-in page. Recreate the login process and list the “Form Data” fields and values. In particular, keep a look out for hidden fields.

Using our Spider, go to the site’s login page.

Create parsing functions and add the Scrapy FormRequest with the form data we collected before.

Make sure our key fields (for form data) correspond to the website’s key fields. After all, variation is to be expected.

Include a quick check to ensure that we have entered our credentials correctly. Look for differences between the “before login” and “after login” pages. This modification will make it easier to tell if we have logged in correctly.

After completing the preceding steps successfully, we can now include the parsing function for data we wish to scrape from the website. In addition, regular Scrapy techniques such as rules and so on are now available.

The below step shows how to use scrapy FormRequest as follows.

1. In this step, we install the scrapy using the pip command. In the below example, we have already installed a scrapy package in our system, so it will show that the requirement is already satisfied, then we do not need to do anything.

pip install scrapy

2. After installing the scrapy in this step, we log into the scrapy shell by using the scrapy shell command, or we can also write code into the visual studio.

scrapy shell

3. After logging into the python shell, duplicate the “Form Data” arguments. If one of the details changes, inspect the page for the changing feature in the source code and extract it into a variable. Then use return FormRequest to include the login information and the name of the callback function that will identify what we want to do scrape from the page we will be routed to after signing in.

Code:

def parse (self, response): py_tok = response.xpath ('//*[@name="py_token"]/@value').extract_first () return FormRequest.from_response (response, formdata = { 'py_token' = py_tok, 'password' = 'scrapy', 'username' = 'scrapy'}, Callback = self.scrape_pages)

Scrapy FormRequest is a dictionary that stores arbitrary request metadata. Its content will be submitted as keyword arguments to the Request callback. It’s empty for new Requests.

The dict is shallow copied and can also be accessed from the response in our spider. Cb_kwargs is a variable.

This dict can be seen in the request’s errback as a failure. chúng tôi kwargs in the event of a request failure.

Scrapy FormRequest Examples

Except for any members whose values have been changed by the keyword arguments. By default, shallow copies are made of the chúng tôi kwargs and chúng tôi attributes.

The HTTP method, URL, headers, cookies, and body are all filled up. This is because it precedes the values of the same arguments in the cURL command.

The below example shows that examples of scrapy formrequest are as follows. In the below example, we will be splitting the function into two parts. The first one, parse, is executed automatically on the start URL we defined. Make the start URL or request point to the site’s login page.

We obtain the value of the CSRF token in the parse function and feed it along with the login and password we used before into the FormRequest function.

Example #1

The below example shows a simple code of scrapy formrequest as follows.

Code:

class ScrapySpider (CrawlSpider): py_name = 'scrapy' def parse (self, response): py_token = response.xpath ('//*[@name="py_token"]/@value').extract_first() print (py_token) yield FormRequest.from_response(response, formdata={'py_token': py_token, 'username':'scrapy', 'password': 'scrapy'}, callback=self.parse_after_login) def parse_after_login (self, response): print (response.xpath('.//div[@class = "col-md-4"]/p/a/text()'))

It’s worth noting that the FormRequest is tied to a function called parse after login. After a successful login, this function is in charge of handling all subsequent activities.

In this new function, we’ve introduced a single line that checks whether or not the login was successful. According to our observations, the website says “login” in a certain part. However, it will also say “log out” if we are logged in.

Example #2

Code:

def parse (self, response): py_form = { } return [FormRequest(py_url = py_url, method = "POST", formdata = py_form, callback = self.parse_form)]

Example #3

In the below example, we are using formrequest with chúng tôi URL. In addition, we have used email ID and password to validate the request.

Code:

def start_requests (self): print 'scrapy login' py_headers = self.make_header (response), formdata = { "email": "[email protected]", "password": "scrapy", }, callback = self.parse_page )]

Conclusion

Each site has its own set of fields, which must be found by the login procedure and watching the data flow. Scrapy formrequest crawls online sites using Request and Response objects. Request objects are typically generated in the spiders and passed through the system until they reach the downloader.

Recommended Articles

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## Vlookup In Excel (Formula, Examples)

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Introduction to VLOOKUP Function in Excel

VLOOKUP in Excel is used to lookup the value with a reference cell and fetch the value from the selected lookup table array and is quite useful and one of the most widely used excel functions We can use a table or single column to lookup the value. And all the lookup can be done in a vertical zone or with columns only.

The vlookup function uses of the arguments:-

There are four arguments in vlookup function which is below mention:

Lookup value (required argument) – it is the value that we want to look up for in the column of a table. Where you want or get the value from another table.

Table array (required argument) – it is the data array that is to be searched. The vlookup function searches in the left-most column of this array. We can say that this is a matching table.

Column index number (required argument) – an integer, specifying the column number of the supplied table array, that you want to return a value from. If you only using it for data matching then you can put 1 but if you want to get a value from another column behave on matching the lookup value then you need to put the column no from matching column no.

Range lookup (optional argument) – it defines what this function should return in the event that it does not find an exact match to the lookup value. The argument can be set to true or false, which means:

True – approximate match, that is, if an exact match is not found, use the closest match below the lookup value.

False – exact match, that is, if an exact match not found then it will return an error.

We can also use 0 for false and 1 for true matching.

Steps for Using VLOOKUP Function

We get a new function window showing in the below mention pictures.

Then we have to enter the details as shown in the picture.

Put the lookup value where you want to match from one table to another table value.

You need to put the table array which is another table value.

Put the col index number for another table vertical value which is a need.

Rage lookup false for exact match and true for an approximate match.

You can also use 0 for an exact match and 1 for an approximate match.

Shortcut for using the Formula

Explanation for VLOOKUP Function:

We can also use one sheet to another sheet and one workbook to another workbook also

How to Use VLOOKUP in Excel?

Vlookup function is very simple and easy to use. Let us understand the working of vlookup. Below mention are the details using the formulas.

You can download this VLOOKUP Function Template here – VLOOKUP Function Template

Example #1 – Exact Match

To search for an exact match, you put false in the last argument.

As above mention in table b there is all information of the employee like department, employee id, address mobile no, etc. You can suppose as array table or master table data. And you have another table where required only contact no of the employee. So as the employee name is a unique column then the employee name a lookup value in a table where you want to get a result.

Master data table b as above showing is a table array, and in master data, you can see that mobile no column is on the 5 number column index. Then we need to put the 0 for exact matching or 1 for false matching.

You can see the result here:

Formula: – “=vlookup(a21,a1:e12,5,0)”

We can see that in a table all values are matching the exact value.

Example #2 – Approximate Match

As above showing in the picture in the H column, there is employee age mention and column I employee name. You can take this as an array or master table. Now I want to put the age value in k2 then we get the employee name which is approximate age as given in k2 age value as showing below mention pictures.

So lets we check the formula now.

“=vlookup(k2,h2:i12,2,true)”

Then we can get the approximate matching value.

As you see, the formula returns Mr. Puneet Sharma whose age is 43, while we also have Mr. Manish patial that age 48 but 43 is much closer to 44 than 48. So, why does it return Mr. Puneet? Because vlookup with approximate match retrieves the closest value that is less than the lookup value.

Things to Remember

The vlookup function returns result in any data type such as a string, numeric, date, etc.

If you specify false for the approximate match parameter and no exact match is found, then the vlookup function will return #n/a.

If you specify true for the approximate match parameter and no exact match is found, then the next smaller value is returned.

If the index number is greater than the number of columns in the table, the vlookup function will return #ref!

Recommended Articles

This has been a guide to VLOOKUP Function. Here we discuss the VLOOKUP Formula and how to use the VLOOKUP function along with an excel example and downloadable excel templates. You may also look at these useful functions in excel-

## How To Use Excel Vba Sleep Function With Examples?

VBA Sleep Function

The sleep function in VBA is a Windows function. It is similar to the wait function in VBA. It is used to slow down or pause or we can say halt the running of a specific code by some specified time. Sleep function needs to be called in VBA while declaring it in the code. How we do that is what we will learn in today’s topic.

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As explained above, VBA Sleep is a Windows function and is present in the kernel database of Windows. The method of declaring and calling sleep functions in VBA differs for both 32-bit and 64-bit operating systems. It is a Windows API function.

The syntax to use the VBA Sleep function is as follows:

Sleep (Time in Mili Seconds)

So if we need to slow down or halt the code for 1 sec, we need to write the code as:

Sleep 1000

1000 is the mili seconds equal to 1 second and will slow down the code for 1 sec. If we want to slow down the code for 5 seconds, the code will be:

Sleep 5000

The declaration for sleep function is as follows:

#If VBA7 Then ' Excel 2010 or later Public Declare PtrSafe Sub Sleep Lib "kernel32" (ByVal Milliseconds As LongPtr) #Else ' Excel 2007 or earlier Public Declare Sub Sleep Lib "kernel32" (ByVal Milliseconds As Long) #End If

Note: Before using the sleep function, there is one thing we need to keep in mind. We need to use this function in modules, not in the objects of Excel. To use VBA to ensure that the developer’s tab is turned on from the files tab in the options section.

How to Use Excel VBA Sleep Function?

We will learn how to use a VBA Sleep function with a few examples in Excel.

You can download this VBA Sleep Excel Template here – VBA Sleep Excel Template

VBA Sleep Function – Example #1

What we are going to do in this example is we will pop up a message to the user that the macro will stop for five seconds. And exactly after five seconds, we want a second message to pop up which says macro resumed.

Follow the below steps to use Sleep Function in Excel VBA:

Step 3: Use the declaration statement to use the sleep function. As I am using Windows 64-bit operating system, I will use the declaration statement for the same.

Code:

Public Declare PtrSafe Sub

Sleep

Lib

"kernel32" (

ByVal

dwMilliseconds

As LongPtr

)

Step 4: Now declare the sub-function to start writing the code.

Code:

Public Declare PtrSafe Sub

Sleep

Lib

"kernel32" (

ByVal

dwMilliseconds

As LongPtr

)

Sub

Sample()

End Sub

Step 5: Use the Mgsbox function to display the message that the macro will be paused for five seconds.

Code:

Public Declare PtrSafe Sub

Sleep

Lib

"kernel32" (

ByVal

dwMilliseconds

As LongPtr

)

Sub

Sample() MsgBox "MAcro going to be paused for five seconds"

End Sub

Step 6: Use the Sleep function to pause the macro for five seconds.

Code:

Public Declare PtrSafe Sub

Sleep

Lib

"kernel32" (

ByVal

dwMilliseconds

As LongPtr

)

Sub

Sample() MsgBox "MAcro going to be paused for five seconds" Sleep 5000

End Sub

Step 7: Now, use the msgbox function to display the message that the macro has been resumed.

Code:

Public Declare PtrSafe Sub

Sleep

Lib

"kernel32" (

ByVal

dwMilliseconds

As LongPtr

)

Sub

Sample() MsgBox "MAcro going to be paused for five seconds" Sleep 5000 MsgBox "Macro has been resumed"

End Sub

Step 8: Run the code from the run button provided or press F5 to see the result. We see the first message is displayed.

There was a pause for five seconds between both messages.

VBA Sleep Function – Example #2

Now what we are going to do in another example is that I have four variables A, B, C, and D. First, I want to add the value of A and B and display it, and after 5 seconds, I want to display the value of the addition of A, B, C, and D.

Follow the below steps to use Sleep Function in Excel VBA:

Step 3: Now, use the declaration statement to use the sleep function. As I am using Windows 64-bit operating system, I will use the declaration statement for the same.

Code:

Public Declare PtrSafe Sub

Sleep

Lib

"kernel32" (

ByVal

dwMilliseconds

As LongPtr

)

Step 4: Now declare the sub-function to start writing the code.

Code:

Public Declare PtrSafe Sub

Sleep

Lib

"kernel32" (

ByVal

dwMilliseconds

As LongPtr

)

Sub

Sample1()

End Sub

Step 5: Declare six variables A, B, C, D, X, and Y to store values.

Public Declare PtrSafe Sub

Sleep

Lib

"kernel32" (

ByVal

dwMilliseconds

As LongPtr

)

Sub

Sample1()

Dim

A, B, C, D, X, Y

As Integer

End Sub

Step 6: Give Random Values to A, B, C, and D.

Code:

Public Declare PtrSafe Sub

Sleep

Lib

"kernel32" (

ByVal

dwMilliseconds

As LongPtr

)

Sub

Sample1()

Dim

A, B, C, D, X, Y

As Integer

A = 10 B = 15 C = 20 D = 25

End Sub

Step 7: Store the value of A + B in X.

Code:

Public Declare PtrSafe Sub

Sleep

Lib

"kernel32" (

ByVal

dwMilliseconds

As LongPtr

)

Sub

Sample1()

Dim

A, B, C, D, X, Y

As Integer

A = 10 B = 15 C = 20 D = 25 X = A + B

End Sub

Step 8: Display the value of X.

Code:

Public Declare PtrSafe Sub

Sleep

Lib

"kernel32" (

ByVal

dwMilliseconds

As LongPtr

)

Sub

Sample1()

Dim

A, B, C, D, X, Y

As Integer

A = 10 B = 15 C = 20 D = 25 X = A + B MsgBox X

End Sub

Step 9: Now, use the sleep function to pause for five seconds.

Code:

Public Declare PtrSafe Sub

Sleep

Lib

"kernel32" (

ByVal

dwMilliseconds

As LongPtr

)

Sub

Sample1()

Dim

A, B, C, D, X, Y

As Integer

A = 10 B = 15 C = 20 D = 25 X = A + B MsgBox X Sleep 5000

End Sub

Step 10: Now, in variable Y, store the value of X +C + D and display it.

Code:

Public Declare PtrSafe Sub

Sleep

Lib

"kernel32" (

ByVal

dwMilliseconds

As LongPtr

)

Sub

Sample1()

Dim

A, B, C, D, X, Y

As Integer

A = 10 B = 15 C = 20 D = 25 X = A + B MsgBox X Sleep 5000 Y = X + C + D MsgBox Y

End Sub

Step 11: Run the above code from the provided run button or by pressing the F5 key to see the result. We see the first message is displayed as.

Step 12: Press OK and the macro waits for five seconds and displays the next result.

VBA Sleep Function – Example #3

In this example, we want to rename two worksheets, sheet 1 and sheet 2, as Anand and Aran, respectively. But the time duration between both should be five seconds. We want the macro to pause after renaming sheet 1 and then rename sheet 2. Currently, both sheets are named as follows:

Follow the below steps to use Sleep Function in Excel VBA:

Step 3: Now, use the declaration statement to use the sleep function. As I am using the Windows 64-bit operating system, I will use the declaration statement for the same.

Code:

Public Declare PtrSafe Sub

Sleep

Lib

"kernel32" (

ByVal

dwMilliseconds

As LongPtr

)

Step 4: Now declare the sub-function to start writing the code.

Code:

Public Declare PtrSafe Sub

Sleep

Lib

"kernel32" (

ByVal

dwMilliseconds

As LongPtr

)

Sub

Sample2()

End Sub

Step 5: Activate worksheet 1 and rename it by the following code:

Code:

Public Declare PtrSafe Sub

Sleep

Lib

"kernel32" (

ByVal

dwMilliseconds

As LongPtr

)

Sub

Sample2() Worksheets("Sheet1").Activate Worksheets("Sheet1").Name = "Anand" MsgBox "Sheet 1 renamed"

End Sub

Step 6: Use the sleep function to use delay for five seconds.

Code:

Public Declare PtrSafe Sub

Sleep

Lib

"kernel32" (

ByVal

dwMilliseconds

As LongPtr

)

Sub

Sample2() Worksheets("Sheet1").Activate Worksheets("Sheet1").Name = "Anand" MsgBox "Sheet 1 renamed" Sleep 5000

End Sub

Step 7: Now rename sheet 2 with the following code.

Code:

Public Declare PtrSafe Sub

Sleep

Lib

"kernel32" (

ByVal

dwMilliseconds

As LongPtr

)

Sub

Sample2() Worksheets("Sheet1").Activate Worksheets("Sheet1").Name = "Anand" MsgBox "Sheet 1 renamed" Sleep 5000 Worksheets("Sheet2").Activate Worksheets("Sheet2").Name = "Aran" MsgBox "Sheet 2 renamed"

End Sub

Step 8: Now run the code and see the first message displayed.

Also, we can check that sheet 1 is renamed.

Step 9: Press ok and wait five seconds for the next message and second sheet to be renamed.

The second sheet is also renamed.

Things to Remember

VBA Sleep is a window function, so to use it, we need to use declaration statements.

There are different declaration statements for different types of operating systems.

Simply using VBA Sleep freezes the macro for the time duration provided.

The time parameter given to the VBA sleep function is in milliseconds.

Recommended Articles

This is a guide to VBA Sleep Function. Here we discuss using Excel VBA Sleep Function, practical examples, and a downloadable Excel template. You can also go through our other suggested articles –

## How To Write, Build, And Use Vlookup Function In Excel

The VLOOKUP function in Microsoft Excel literally means vertical lookup. It’s a search function for querying values in the cell of a column. This function searches for the data relative to the entries in the first column from the left.

A vertical data search is most vital when dealing with tables with numerous columns and rows. Instead of scrolling through and analyzing hundreds of cells, Excel’s VLOOKUP function helps you find the data you’re looking for by looking up the values from top to bottom.

Create, build & use Excel’s VLOOKUP function

In our example, we’ll work with a VLOOKUP function that searches for information about seven employees’ salaries. This section shows you how to use the VLOOKUP function in the following ways:

Write the Excel VLOOKUP function.

Build a VLOOKUP function in Excel.

Without further ado, let’s get to it. In the first method, we’ll create the function manually. Next, we’ll use it from Excel’s inbuilt Functions Arguments wizard.

1] Write the Excel VLOOKUP function

Launch Microsoft Excel and make a column for the values that act as unique identifiers. We’ll call this the reference column.

Add some more columns to the right-hand side of the first one you created in the first step and insert values for the cells in these columns.

=VLOOKUP()

On entering the above formula, Excel suggests the VLOOKUP syntax:

=VLOOKUP(vlookup_value,table_array,col_index_num,range_lookup) Arguments or parameters

Here are what the above arguments define in the syntax:

lookup_value: the cell with the product identifier from the reference column.

table_array: the data range from with to search. It must contain the reference column and the column containing the value you’re looking up. In most cases, you can use the entire worksheet. You can drag your mouse over the values of the table to select a data range.

col_index_num: the number of the column from which to look up a value. You put this in from left to right.

range_lookup: TRUE for an approximate match, FALSE for an exact match. The value is TRUE by default, but you generally use FALSE.

With this information, we’ll now replace the parameters in the parenthesis with the information we wish to look up. For example, to return Wayne Creed‘s salary, enter the following formula:

=VLOOKUP(C14,B5:E11,6,FALSE)

On navigating away from the cell with the VLOOKUP formula, it returns the value for which you queried. If you get a #N/A error, read this Microsoft guide to learn how to correct it.

2] Build a VLOOKUP function in Excel

The first part showed you how to create a VLOOKUP function manually. If you thought the above method was easy, wait till you read this. Here, you’ll learn how to build a VLOOKUP function quickly using the user-friendly Functions Arguments wizard.

Open Microsoft Excel first, and create a reference column that will contain unique identifiers.

Next, create some more columns on the right-hand side of the reference column. Here, we’ll insert the relevant values for the items on the reference column.

Select an empty cell and type in a value from the reference cell. This is the value whose properties we’ll lookup.

Select the Lookup & Reference tool from the Functions Library and choose VLOOKUP from the dropdown menu. This opens the Functions Arguments wizard.

Fill in the Lookup_value, Table_array, Col_index_num, and Range_lookup fields in the Functions Arguments wizard specified in the first method.

Hit the OK button when you’re done, and the VLOOKUP function will return the results from the arguments you entered.

This guide will help you if the Excel formula fails to update automatically.

Both methods will successfully query the data you need in reference to the first column. The Formulas Argument wizard makes it easy to input the variables to make the VLOOKUP function work.

However, the VLOOKUP function also works on the web version of Excel. You also get to use the Functions Argument wizard or create the VLOOKUP function manually on the web version.

Let us take a look at the HLOOKUP function in Excel now.

## How To Dump Mysql Server With Examples?

Introduction to MySQL Dump

In case the system’s database is corrupted, crashed, or lost, we should be able to restore the data in the database. For this reason, MySQL provides us with a facility to dump the database using mysqldump utility. You can use this utility only if you have access to your database, you have been assigned the select privilege on the tables of that database, and the database is currently running. The utility creates a logical backup and generates a flat file containing SQL statements. Later on, you can execute these SQL statements to restore the database to the same state it was in when the backup file was created. This utility supports both single and multiple database backups. Additionally, the mysqldump utility has the capability to export the data in XML, CSV, or any other delimited text format.

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We must dump our database frequently to have the updated backup of the database available to us. Whenever the backup is restored the database will be back to the state when that dump file was being created using mysqldump.

Pre-requisites

There are certain privileges on the tables, views, triggers, and transactions that we should have to use the mysqldump utility. It depends on the content that we are backing up. If we are backing up the database that contains tables then you should have select privilege, for views it is necessary to have SHOW VIEW privilege, for triggers TRIGGER privilege and if we use –the single-transaction option while dumping the database then the LOCK TABLES privilege should be there with us.

Similarly, while reloading or restoring the dumped data, we must possess the privilege such as CREATE, INSERT, and ALTER privileges that might be present in your dumped flat file that will be executed. The ALTER statements may be present in the dumped file sometimes when stored programs are dumped for encoded character preservations. To execute this ALTER command and modify the database collation, the user must have the ALTER privilege assigned to them.

Syntax of MySQL Dump

Dumping one or more of the selected tables:

Dumping one or more of the selected databases:

Dumping Complete MySql Server

Syntax of dumping complete mysql server are:

Many options we can use to specify the behavior or values of some of the objects like -u for the username using which we will login -p to mention the password and other options related to defining the behavior of dumping. There are many different types of options that can be specified. We categorize them into the following types: –

Connection Options

Option-File Options

DDL Options

Debug Options

Help Options

Internationalization Options

Replication Options

Format Options

Filtering Options

Performance Options

Transactional Options

To see a complete list of the options that are available and can be used, we can execute the following command –

mysqldump -u root p –help

that gives the following output displaying all the options and usage of the same:

as the list is too big, you can export it tho the file and then open the file to view the options and search for options that can be used in your context and use case. You can export the output to a file by executing the following command:

Output:

And the temp file when opened on an editor looks like the following:

Examples of MySQL Dump

Let us consider one example, we will firstly query on my database server to display all databases –

show databases;

Output:

Now, we will use educba database and check the tables present in it.

use educba; show tables;

Let us now see all the records present in the developers table.

select * from developers;

Output:

Now, let us export the educba database using the mysqldump command –

Output:

Note that we will have to exit from the MySQL command shell and then execute the above command. After, a file named chúng tôi file will be created on the same path. After opening the file, we will see that it contains all the commands of SQL that will recreate the educba database in case if we restore this file to a certain database. Here’s how that file will look like:

This is the dumped flat-file that was created after performing a dump of the ‘educba’ database. The file consists of commands to create the database, create a table, and insert queries to populate the table with records.

Restoring the Database

Let us now drop the database educba using the following command –

DROP DATABASE educba;

Output:

And now confirm the available databases by using the command –

show databases;

Output:

We can see that the educba database does not exist in our database server of MySQL. Now, we will restore the educba database from the backup file chúng tôi that we created by dumping the educba database previously.

You can restore the database using the following command:

sudo mysql -u root -p < backupOfEducba.sql

Output:

Let us check the contents of the backup_educba database

show database; use educba; MySQL select * from developers;

Output:

Upon restoration, it becomes evident that the database named ‘educba’ is reestablished, and it encompasses identical content as that of the ‘developer’ table, including all the records within.

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