DATALENGTH() Function in SQL Server

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