小编Max*_*cob的帖子

我有两个表 ( SJob& SJobDependent)，我需要为存储过程中的某些逻辑加入它们。它们都有一列 ( job)以一对多关系连接它们- 一条SJob记录对应零个或多个SJobDependent记录。

这是我的 SQL 查询：

-- Return any records that are active and have no unsatisfied dependencies.
SELECT * FROM SJob
LEFT JOIN SJobDependent
    ON SJob.job = SJobDependent.job
    AND SJobDependent.satisfied = 0
WHERE SJobDependent.jobDependentID IS NULL
AND SJob.state = 'active'

这是SQL Server Studio的实际执行计划：

由于代码的编写方式：

-- Return any records that are active and have no unsatisfied dependencies.
SELECT * FROM SJob
LEFT JOIN SJobDependent
    ON …