SQL REPLICATE function repeats a string value a specified number of times.


REPLICATE (inputstring, integer)

inputstring is the string of a character string or binary data type. It can be either a character or binary data.

integer is an any integer value, including bigint. If it is negative then NULL value is returned.

Lets look at an example of REPLICATE() function in SQL.

Using Replicate function with string

The following example uses REPLICATE() function and repeats a given string for five time .

DECLARE @inputsrtring VARCHAR(100)='welcome to sqlskull.com ! '

SELECT REPLICATE(@inputsrtring,5) AS String_After_Replicate

Using Replicate function with character

The following example replicates a character for five time .

DECLARE @inputChar VARCHAR(5)= 'S'

SELECT REPLICATE(@inputChar,5) AS After_Replicate

Using a Replicate function for Generating a hint pattern (overriding a string characters with any specific character)

You can override a string character with any specific character using replicate() function.

Usually, you may have come across with a hint pattern most of the time during a password recovery OTP or any security page on bank websites wherein users are asked to choose either phone number or mail id for receiving an OTP while few of characters of phone number or mail id are hidden on page, especially characters are replaced with a  ‘*’ ,  which may be something like “Your OTP for password recovery is sent on this mail xyz*****@gmail.com”.

Obviously, it is done for security reasons,  just to give a quickly hint to user that you have to check that specific mail id or phone number on which OTP is being sent without showing a complete mail Id or phone number details on screen.

Following statement uses replicate function which adds five * in place of last five characters of phone number.

SELECT  PhoneNumber ,
SUBSTRING (PhoneNumber ,1,(LEN(PhoneNumber)-5 ) ) + REPLICATE('*',5) 
AS PhoneNumber_AfterReplicate  
FROM [Person].[PersonPhone]


As you can see, Last five characters are replicated with ‘*’,  It gives a hint that password is being sent on that phone number without displaying complete phone number .

Here we have used substring function and len function to get the substring from a string after excluding last five character of its length .

Also Read..














SQL Basics TutorialSQL Advance TutorialSSRSInterview Q & A
SQL Create tableSQL Server Stored ProcedureCreate a New SSRS Project List Of SQL Server basics to Advance Level Interview Q & A
SQL ALTER TABLESQL Server MergeCreate a Shared Data Source in SSRSSQL Server Question & Answer Quiz
SQL DropSQL Server PivotCreate a SSRS Tabular Report / Detail Report
..... More.... More....More
Power BI TutorialAzure TutorialPython TutorialSQL Server Tips & Tricks
Download and Install Power BI DesktopCreate an Azure storage accountLearn Python & ML Step by stepEnable Dark theme in SQL Server Management studio
Connect Power BI to SQL ServerUpload files to Azure storage containerSQL Server Template Explorer
Create Report ToolTip Pages in Power BICreate Azure SQL Database ServerDisplaying line numbers in Query Editor Window

 32 total views,  1 views today

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.