提高性能SQL

在同一个内部查询运行多次的情况下，如何定制以下SQL以提高性能？在此先感谢提高性能SQL

DELETE FROM interactionrel 
WHERE (from_interact_id IN(SELECT interaction_id 
          FROM interaction 
          WHERE instance_pk = ?)) 
     OR (to_interact_id IN(SELECT interaction_id 
           FROM interaction 
           WHERE instance_pk = ?))

来源

2013-03-15 user1582625

该声明是无效的语法（'这里（从.. '），并请正确格式化。 – 2013-03-15 11:10:58

它是SQL Server的 – DevelopmentIsMyPassion 2013-03-15 11:11:25

语法是正确的只有我会正确格式化。 DELETE FROM INTERACTIONREL WHERE （FROM_INTERACT_ID IN （SELECT INTERACTION_ID FROM互动的情况INSTANCE_PK =？）） OR （TO_INTERACT_ID IN （SELECT INTERACTION_ID FROM互动的情况INSTANCE_PK =？）） – user1582625 2013-03-15 11:14:15

DELETE il 
FROM interactionrel il, 
     interaction 
WHERE (interaction.interaction_id = il.from_interact_id 
      OR interaction.interaction_id = il.to_interact_id) 
     AND interaction.instance_pk = ?

来源

2013-03-15 11:18:33

感谢相同，但它不工作。我正在使用IBM DB2。 SQLCODE = -104，SQLSTATE = 42601，SQLERRMC = JOIN; – user1582625 2013-03-15 11:34:25

你可以试试这个 - 虽然你将需要针对优化运行此：

DELETE FROM interactionrel a 
WHERE EXISTS (SELECT * 
       FROM interaction b 
       WHERE b.instance_pl = ? 
        AND (b.interaction_id = a.from_interact_id 
         OR b.interaction_id = a.to_interact_id))

来源

2013-03-15 21:14:51

它的工作。谢谢.. – user1582625 2013-03-19 10:32:31

提高性能SQL

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