Fab*_*cio 1 mysql sql query-optimization
(你可以在这里理解更好的阅读)
我想知道是否有可能优化此查询:
SELECT id_type, value FROM Action, Action_set WHERE id_action = id_action_p1 AND id_action_set = 1
UNION ALL
SELECT id_type, value FROM Action, Action_set WHERE id_action = id_action_p2 AND id_action_set = 1
UNION ALL
SELECT id_type, value FROM Action, Action_set WHERE id_action = id_action_p3 AND id_action_set = 1
UNION ALL
SELECT id_type, value FROM Action, Action_set WHERE id_action = id_action_p4 AND id_action_set = 1
UNION ALL
SELECT id_type, value FROM Action, Action_set WHERE id_action = id_action_p5 AND id_action_set = 1
UNION ALL
SELECT id_type, value FROM Action, Action_set WHERE id_action = id_action_p6 AND id_action_set = 1
UNION ALL
SELECT id_type, value FROM Action, Action_set WHERE id_action = id_action_p7 AND id_action_set = 1
UNION ALL
SELECT id_type, value FROM Action, Action_set WHERE id_action = id_action_p8 AND id_action_set = 1
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尝试:
SELECT id_type, value
FROM Action, Action_set
WHERE id_action IN (id_action_p1,id_action_p2,id_action_p3,id_action_p4,id_action_p5,id_action_p6,id_action_p7,id_action_p8)
AND id_action_set = 1
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如果有多行尝试:
SELECT id_type, value
FROM Action, Action_set
WHERE (id_action = id_action_p1
OR id_action = id_action_p2
OR id_action = id_action_p3
OR id_action = id_action_p4
OR id_action = id_action_p5
OR id_action = id_action_p6
OR id_action = id_action_p7
OR id_action = id_action_p8)
AND id_action_set = 1
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