如果以以下方式写到NOT询问,两者之间有何区别。
SELECT iBatchID,COUNT(*) FROM #temp WHERE NOT iBatchID IN (1) GROUP BY iBatchID
SELECT iBatchID,COUNT(*) FROM #temp WHERE iBatchID NOT IN (1) GROUP BY iBatchID
如果使用<代码>,两者之间有何区别。 WHERE NOT iBatchID IN (1) and WHERE iBatchID NOT IN (1) ?
没有任何区别。 他们将得出同样的询问结果。
我认为,执行计划应当相同,但找到这一计划的最佳办法是抓住每个问题的实际执行计划。
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