Question

我有一个存储客户端的表，然后将这些客户端分组在一个被视为该组“头部”的客户端下。因此，如果客户出现在“群组”列中，即使他们可能不属于他们自己的“群组”，也会被视为“头”。该表可能如下所示：

+--------+-------+------+
| Client | Group | Head |
+--------+-------+------+
| ABC    | ABC   | Yes  |
| DEF    | ABC   | No   |
| GHI    | GHI   | Yes  |
| JKL    | MNO   | Yes  |
| MNO    | PQR   | Yes  |
| PQR    | MNO   | No   |
| STU    | STU   | Yes  |
+--------+-------+------+

在这里我们可以看到客户端JKL和PQR的'Head'记录不正确。我需要的是一个列表，其中只有“Head”列不正确且应该是什么的客户（Yes / 1或No / 0）。这样做的最佳方法是什么？

Answer 1

使用SQL select语句WHERE和double equal sign ==

select * from tableName where Head=="No";

您可以将记录更新为您喜欢的内容 ;

UPDATE tableName
SET Head = 0
WHERE Head="No";

希望这有帮助。

Answer 2

declare @t table(Client varchar(50), [Group]  varchar(50), Head  varchar(50))

insert into @t values( 'ABC','ABC','Yes'),
('DEF','ABC','No'),
('GHI','GHI','Yes'),
('JKL','MNO','Yes'),
('MNO','PQR','Yes'),
('PQR','MNO','No'),
('STU','STU','Yes')

select * from @t t1 
where t1.client not in (select distinct [Group] from @t t3 where t3.Head = 'Yes' and t3.Client = t3.[group]) 
--and Head = 'Yes' --please uncomment this line and check the result, if any issue to desire your result, tell me

Answer 3

Declare @a Table (Client Varchar(10),[Group] Varchar(10),Head Varchar(3))

Insert into @a Values ('ABC','ABC','YES') 
Insert into @a Values ('DEF','ABC','No')
Insert into @a Values ('GHI','GHI','YES')
Insert into @a Values ('JKL','MNO','YES')
Insert into @a Values ('MNO','PQR','YES')
Insert into @a Values ('PQR','MNO','No')
Insert into @a Values ('STU','STU','YES')

-- uncomment here to get only wrong ones
--Select * from (

Select a.*, Coalesce(h.RealHead,'No') as RealHead 
       , CASE WHEN Coalesce(h.RealHead,'No')<>a.Head then 'ERROR' else 'OK' end as Info
FROM @a a
LEFT JOIN (Select Distinct [Group], 'YES' as RealHead from @a) h 
ON h.[GROUP]=a.Client -- Join real Heads with clients

-- uncomment here to get only wrong ones
--) s where Info='ERROR'

根据其他列值更新列

3 个答案: