Question

与其他表格我有像

这样的表格

rowsid     source_row   same_as_row 

row1       1                18    

row2       3                 18

row3       18                1

row4       18                3

我只想删除第3行和第4行：

row3       18                1

row4       18                3

哪个查询！删除查询第3行和第4行.help

Answer 1

DELETE FROM table 
GROUP BY sourcerow
HAVING COUNT(*) > 1

它应该这样做，假设您只在sourcerow列

中查找重复值

Answer 2

编辑：让我失望（之前的答案已删除）

由于双嵌套有效，这就是我这样做的方式（尽管从逻辑的角度来看，它的一部分是高度冗余的）

DELETE
  yourTable
FROM
  yourTable
INNER JOIN
  (SELECT * FROM (SELECT same_as_row FROM yourTable GROUP BY same_as_row)) as lookup
    ON lookup.same_as_row = yourTable.source_row
WHERE
    source_row > same_as_row

Answer 3

select 
    rowsid, source_row, same_as_row
from tablename t1
where not exists 
(
    select * from tablename t2
    where t2.source_row = t1.same_as_row and t2.same_as_row = t1.source_row and t1.rowsid > t2.rowsid)
)

Answer 4

DELETE FROM table GROUP BY rowsid，source_row，same_as_row 有计数（*）＆gt; 1

如何删除不同列的双重条目

4 个答案: