Question

我对删除LQ有一些麻烦。页: 1 服务器在以下条款中具有多个参数:从<条码>中删除行文(表_02)(目录见表1)。在这方面的任何帮助将受到高度赞赏。

感谢。

DELETE FROM table_02
        WHERE (col_1,col_2,col_3,col_4)
        IN (            
            SELECT col_1,col_2,col_3,col_4 
                    FROM table_01
                    GROUP BY
                    col_1,col_2,col_3,col_4
                    HAVING SUM(CASE WHEN col_1<6 THEN col_2*-1 ELSE col_2 END)=0
           )

Answer 1

You can rewrite IN as an EXISTS

DELETE 
FROM table_02
WHERE  EXISTS(SELECT *
              FROM   table_01
              WHERE  table_02.col_1 = table_01.col_1
                     AND table_02.col_2 = table_01.col_2
                     AND table_02.col_3 = table_01.col_3
                     AND table_02.col_4 = table_01.col_4
              HAVING SUM(CASE
                           WHEN col_1 < 6 THEN col_2 * -1
                           ELSE col_2
                         END) = 0)

Answer 2

Delete a  
from table1 a 
Inner Join table2 b 
on  a.col = b.col 
WHERE ...

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