如何优化以下查询

Question

DELETE FROM CommissPlanF
WHERE CommissPlanID = (SELECT dbo.CommissPlan.CommissPlanID
                       WHERE dbo.CommissPlan.CP_CommissPlan = 'test')

Answer 1

您可以将两个表连接在一起，而不是使用子查询：

DELETE CommissPlanF
FROM CommissPlanF f
INNER JOIN dbo.CommissPlan c ON c.CommissPlanID = f.CommissPlanID
                            AND c.CP_CommissPlan = 'test'

Answer 2

您可以在此处使用INNER JOIN（假设是SQL Server）。

DELETE cpf
FROM dbo.CommissPlanF cpf
INNER JOIN dbo.CommissPlan cp ON cp.CommissPlanID = cpf.CommissPlanID
WHERE cp.CP_CommissPlan = 'test'