Question

我正在调整存储过程。存储过程正在执行SELECT并且具有大约50个WHERE条件。 SQL类似于下面的内容。如果有更好的方法来检查这些条件，你能告诉我吗

SELECT * FROM table A 
JOIN table B
ON A.ID = B.ID
WHERE
  (
            (
            A.name = 'abc'
            and B.AID not in ( 111, 222) 

            )
        or

        (A.name = 'def'
        and B.AID not in ( 222,1113,111,654,199,43,243,643,754244,2434) 
        )
        or

        (
        A.name = 'etd'
        and B.AID not in ( 111,345,54,34,454) 

        )
        or

        (
        A.name = 'ent'
        and B.AID not in ( 111,188,199,1647,128006) 
        )
        or

        (
        A.name = 'yyy'
        and B.AID not in (111,188,1113,1647) 
        )
        or

        (
        A.name = 'uuu'
        and B.AID not in (111,188,1113,1647) 
        )
        or

        (
        A.name = 'jyf'
        and B.AID not in (111,188,1647,344,45444,645) 
        )
        or

        (
        A.name = 'tut'
        and B.AID not in (111,222,1113,1647) 
        )

）

Answer 1

创建一个表来映射名称和ID：

Name    AID
------  ------
abc     111
abc     222
def     222
def     1113

..etc

使用LEFT联接排除匹配项：

SELECT * FROM table A 
JOIN table B 
  ON A.ID = B.ID
LEFT JOIN Exclusions e
  ON A.name = e.name
     and B.AID = e.AID
WHERE e.name IS NULL   -- not in exclusion table

或NOT EXISTS：

    SELECT * FROM table A 
    JOIN table B 
      ON A.ID = B.ID
    WHERE NOT EXISTS(
        SELECT null FROM Exclusions e
        WHERE A.name = e.name
         and B.AID = e.AID
        )

多个WHERE条件WITH NOT IN

1 个答案: