DATALENGTH Function in SQL Server: A Practical Guide

DATALENGTH Function in SQL Server is easier to understand when the core ideas are paired with practical examples. The sections below explain the topic clearly, highlight useful steps, and point out details that can prevent common errors.

The article will explore and show you how to use the DATALENGTH function in SQL Server to display the number of bytes used to represent an expression.

Describe

The DATALENGTH function in SQL Server returns the length of an expression, in bytes.

Syntax

To use the DATALENGTH function in SQL Server, we use the following syntax:

 DATALENGTH(bieu_thuc)

 SELECT DATALENGTH('TipsMake.com'); 
 Result: 15 
 
 SELECT DATALENGTH(' TipsMake.com '); 
 Result: 17 
 
 SELECT DATALENGTH(1234); 
 Result: 4 
 
 SELECT DATALENGTH('20-02-2019'); 
 Result: 10 
 
 SELECT DATALENGTH(' '); 
 Result: 1 
 
 SELECT DATALENGTH(''); 
 Result: 0 
 
 SELECT DATALENGTH(NULL); 
 Result: NULL

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FAQ

What should you know about describe?

The DATALENGTH function in SQL Server returns the length of an expression, in bytes.

What should you know about syntax?