Using the IN or BETWEEN operator and index
values on an ENUM column fails:
CREATE TABLE test (c enum ('one', 'two'));
INSERT INTO test VALUES (1), (2);
SELECT * FROM test WHERE c='one' OR c='two';
-- works, returns both rows
SELECT * FROM test WHERE c=1 OR c=2;
-- works, returns both rows
SELECT * FROM test WHERE c IN ('one', 'two');
-- works, returns the two rows
SELECT * FROM test WHERE c IN (1, 2);
-- fails, 0 rows returned
SELECT * from test WHERE c BETWEEN 'one' AND 'two';
-- works, returns the two rows
SELECT * from test WHERE c BETWEEN 1 AND 2;
-- fails, 0 rows returned
MyISAM tables on v. 3.23.45.
/ Carsten
--
Carsten H. Pedersen
keeper and maintainer of the bitbybit.dk MySQL FAQ
http://www.bitbybit.dk/mysqlfaq
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