DIFFERENCE function [String]

Returns the difference in the SOUNDEX values between the two string expressions.

Syntax

DIFFERENCE ( string-expression-1, string-expression-2  )

Parameters

string-expression-1 The first SOUNDEX argument.
string-expression-2 The second SOUNDEX argument.

Remarks

The DIFFERENCE function compares the SOUNDEX values of two strings and evaluates the similarity between them, returning a value from 0 through 4, where 4 is the best match.

This function always returns some value. The result is NULL only if one of the arguments are NULL.

Standards and compatibility

SQL/2003 Vendor extension.

Example

The following statement returns the value 3.

SELECT DIFFERENCE( 'test', 'chest' );