Question

是否有更好的方式编写以下查询，以最大程度地减少WHERE语句中的代码重复？

SELECT  TA.*
FROM TA
JOIN TB on TA.id = TB.id
JOIN TC on TB.id =TC.id
JOIN TD on TC.id = TD.id
JOIN TE on TD.id = TE.id
WHERE
    TC.Name NOT IN (‘John’,’William’,’Jacob’,’Henry’,’David’)
AND TD.Name NOT IN (‘John’,’William’,’Jacob’,’Henry’,’David’)
AND TE.Name NOT IN (‘John’,’William’,’Jacob’,’Henry’,’David’)

-注意：过滤器始终相同：NOT IN（“约翰”，“威廉”，“雅各布”，“亨利”，“大卫”）

Answer 1

将exists与table value constructor结合使用，您可以执行以下操作：

SELECT  TA.*
FROM TA
JOIN TB on TA.id = TB.id
JOIN TC on TB.id =TC.id
JOIN TD on TC.id = TD.id
JOIN TE on TD.id = TE.id
WHERE NOT EXISTS (
    SELECT 1
    FROM (VALUES('John'),('William'),('Jacob'),('Henry'),('David')) V(name)
    WHERE Name IN(TC.Name, TD.Name, TE.Name)
)

使用不止一列的NOT IN进行过滤

1 个答案: