Question

我正在尝试使用以下代码删除重复项：

delete [TABLE] f
where id not in (select min(id) 
                 from [TABLE] s
                 where f.companyid = s.companyid
                 and f.value = s.value)

但是，它给出了以下错误消息：

Msg 102，Level 15，State 1，Line 1
'f'附近的语法不正确。

语法有什么问题？

Answer 1

在SQL Server中，我喜欢使用CTE和row_number()来实现此目的：

with todelete as (
      select t.*,
             row_number() over (partition by companyid, value order by id) as seqnum
      from t
     )
delete todelete
    where seqnum > 1;

但你的语法问题是它应该开始：

delete f from [TABLE] f
    where . . .

换句话说，表别名在FROM子句中定义。

Answer 2

delete  from  [TABLE] f
where id not in (select min(id) from [TABLE] s
where f.companyid = s.companyid
and f.value = s.value)

Answer 3

DELETE FROM [TABLE] f 
WHERE id NOT IN ( SELECT MIN(id) FROM [TABLE] s
                  where f.companyid = s.companyid and f.value = s.value)

Answer 4

从f中删除id不在（从f中选择min（id），其中f.companyid = s.companyid和f.value = s.value）;

尝试。

Answer 5

它给出错误，因为表的别名使用错误。要使用删除语句对表进行别名，您可以使用;

delete f from [TABLE] as f
where id not in (
    select min(id) from [TABLE] s
    where f.companyid = s.companyid
    and f.value = s.value
)

删除重复项时语法错误

5 个答案: