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A small explanation regarding comparison of ENUM and SET values

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unknown 2002-09-04 21:25:53 +03:00
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Docs/manual.texi
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@ -33868,6 +33868,11 @@ Returns the minimum or maximum value of @code{expr}. @code{MIN()} and
@code{MAX()} may take a string argument; in such cases they return the @code{MAX()} may take a string argument; in such cases they return the
minimum or maximum string value. @xref{MySQL indexes}. minimum or maximum string value. @xref{MySQL indexes}.
There is one inconsistency in MySQL in handling @code[ENUM] and @code[SET]
types when it comes to @code{MIN()}, @code{MAX()} and other aggregating
functions. MySQL will compare values based on string values of the columns,
instead of it's relative position. This will be fixed in future.
@example @example
mysql> SELECT student_name, MIN(test_score), MAX(test_score) mysql> SELECT student_name, MIN(test_score), MAX(test_score)
-> FROM student -> FROM student