How to refactor this MySQL code?
Posted
by Jader Dias
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Published on 2010-04-20T19:33:26Z
Indexed on
2010/04/20
19:43 UTC
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Filed under:
mysql
|refactoring
SELECT *
(
SELECT *
FROM `table1`
WHERE `id` NOT IN (
SELECT `id` FROM `table2`
WHERE `col4` = 5
)
group by `col2` having sum(`col3`) > 0
UNION
SELECT *
FROM `table1`
WHERE `id` NOT IN (
SELECT `id` FROM `table2`
WHERE `col4` = 5
)
group by `col2` having sum(`col3`) = 0
) t1;
For readability and performance reasons, I think this code could be refactored. But how?
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