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DATALENGTH() Function in SQL Server

Last Updated : 03 Dec, 2020
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DATALENGTH() : This function returns the length of an expression and expression length will be in bytes. Syntax :
DATALENGTH( expression )  
  • Parameter - This method accepts a single-parameter as mentioned above and described below as follows.
  • Expression - It is an expression of the data type to return the length for. If expression is NULL, it returns NULL.
Returns : It returns the number of bytes used to represent an expression. Example-1 : Return the length of an expression.
SELECT DATALENGTH('Geeksforgeeks');
Output :
13
Example-2 : Check DATALENGTH() Function count trailing spaces or not.
SELECT DATALENGTH('GFG   ');
Output :
6
Example-3 : Check DATALENGTH() Function count leading spaces or not.
SELECT DATALENGTH('    GFG');
Output :
7
Example-4 : DATALENGTH() Function return NULL, if the expression is NULL.
SELECT DATALENGTH(NULL);
Output :
NULL

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