SOUNDEX(x) is a
string function that converts a character string x to a format that is generated by the SOUNDEX algorithm.This representation can be used if the user does not know the exact spelling of the search term.
Result of the SOUNDEX(x) function | |
SOUNDEX(x) |
The SOUNDEX algorithm is used. The result is a value with the data type CHAR(4). |
x is NULL value |
NULL value |
The
Since inversions cannot be used here, it is advisable for performance reasons to define an additional table column x1 with the data type CHAR(4), in which the result of SOUNDEX(x) is then inserted.
The requests should then refer to x1:
Instead of