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DIFFERENCE function [String]

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

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

string-expression-1    The first SOUNDEX argument.

string-expression-2    The second SOUNDEX argument.

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.

• SOUNDEX function [String]
• UltraLite String functions

• SQL/2003    Vendor extension.

The following statement returns the value 3.

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