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DATALENGTH function [System]

Returns the length, in bytes, of the underlying storage for the result of an expression.

DATALENGTH( expression )

expression    expression is usually a column name. If expression is a string constant, you must enclose it in quotes.

The return values of the DATALENGTH function are as follows:

• SQL/2003    Vendor extension.

The following statement returns the value 27, the longest string in the CompanyName column.

SELECT MAX( DATALENGTH( CompanyName ) )
FROM Customers;

The following statement returns the value 22, the length of the string '8sdofinsv8s7a7s7gehe4h':

SELECT DATALENGTH( '8sdofinsv8s7a7s7gehe4h' );