Question

我有这个查询...我需要将其更改为TSQL支持的语句...我相信我需要更改为不存在的位置...但我还需要3个删除语句（每个表删除一次）？）

DELETE DISTINCTROW TABLE1.*, TABLE2.column1, TABLE3.column2
FROM (
  TABLE1 LEFT JOIN TABLE2 ON (TABLE1.column3 = TABLE2.column3)
    AND (TABLE1.column1 = TABLE2.column1)
  )
LEFT JOIN TABLE3 ON (TABLE1.column3 = TABLE3.column3)
  AND (TABLE1.column1 = TABLE3.column2)
WHERE (
    ((TABLE2.column1) IS NULL)
    AND ((TABLE3.column2) IS NULL)
    );

Answer 1

如果我正确理解了这个问题，你可以通过使用select获取每个表的键值来实现。然后使用3个删除语句

DECLARE @RecIds AS TABLE (sTableName VARCHAR(100), recidTableXRecord INT)

INSERT INTO @RecIds (recidTable1 , recidTableXRecord)
SELECT 'Table1', <Unique Record Id for table 1>
FROM  .... ( ) AS TableRecords1

INSERT INTO @RecIds (recidTable2 , recidTableXRecord)
SELECT 'Table2', <Unique Record Id for table 1>
FROM  .... ( ) AS TableRecords1

INSERT INTO @RecIds (recidTable3 , recidTableXRecord)
SELECT 'Table3', <Unique Record Id for table 1>
FROM  .... ( ) AS TableRecords1

...然后删除

DELETE FROM TABLE1 WHERE recidTable1 IN (SELECT recidTableXRecord FROM @RecIds WHERE sTableName ='TABLE1')

DELETE FROM TABLE2 WHERE recidTable1 IN (SELECT recidTableXRecord FROM @RecIds WHERE sTableName ='TABLE2')

DELETE FROM TABLE3 WHERE recidTable1 IN (SELECT recidTableXRecord FROM @RecIds WHERE sTableName ='TABLE3')

......可能有更好的方法，但这会起作用并且易于维护。建议把所有事情都放在交易中。

将Access delete distinctrow（多表删除）转换为SQL

1 个答案: