REPLACE(x,y,z) is a string function that replaces the character string y in the character string x with the character string z. All character strings are string specifications. Only expressions that produce an alphanumeric value are permitted as string specifications.
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Result of the REPLACE(x,y,z) function |
REPLACE(x,y) |
The character string y in x is deleted |
x is a NULL value |
NULL Value |
y is NULL value |
x remains unchanged |
z is NULL value |
The character string y in x is deleted |
SQL Tutorial, Changing Character Strings
See also: