Question

我有以下简单查询：

SELECT
  Company.Company_Name,
  Company_Team.Team_Role_Recid
FROM
  Company
  INNER JOIN
  Company_Team ON Company_Team.Company_RecID = Company.Company_RecID

Team_Role_Recid的值可以是：

1, 2, 3 or NULL

或组合。可以有1和2，或2和3，或只有2，或根本没有，等等。你明白了。

我希望始终列出每个Company_Name结果，但只显示Team_Role_Recid（如果它是1），否则将其替换为'None Assigned'。

我在where子句中尝试了各种方法，甚至尝试了一个子查询，在select语句中使用CASE WHEN进行“无分配”更改但没有运气。

干杯

[编辑]

我可能没有尽可能清楚。我将添加此内容以尝试使其更清晰。

如果是1，我需要列出公司和Team_Role_Recid。如果Team_Role_Recid不是1，则需要说'None Assigned'。

CompanyName      TeamRecID

Company A        1
Company B        None Assigned
Company C        None Assigned
Company D        1
Company E        1
Company F        None Assigned

公司的Team_Role_Recid记录可以是2，或者只是3，或者数据库中的1和2或1和3等，但我想按上面的方式显示它。

希望有所帮助。

Answer 1

使用LEFT JOIN代替，COALESCE代替NULL值：

SELECT a.Company_Name,
       COALESCE(b.Team_Role_Recid, 'None Assigned') RecID
FROM   Company a
           LEFT JOIN Company_Team b
               ON b.Company_RecID = a.Company_RecID 
-- WHERE  b.Team_Role_Recid = 1

Answer 2

试试这个

SELECT a.Company_Name,CASE WHEN isnull(b.Team_Role_Recid,0) = 1 then b.Team_Role_Recid else 'None Assigned' end
FROM   Company a
       LEFT JOIN Company_Team b
       ON b.Company_RecID = a.Company_RecID

Answer 3

你在找这个吗？

Declare @Company table(Company_Name Varchar(50),Company_RecID int)
Insert Into @Company 
Select'Company1', 1 Union All Select 'Company2', 2 Union All 
Select 'Company3',3 Union All Select 'Company4',4

Declare @Company_Team table(Company_RecID int,Team_Role_Recid Varchar(10) null)
Insert Into @Company_Team 
Select 1,1 Union All 
Select 1,2 Union All Select 1,3 Union All Select 2, Null Union All
Select 3,1 Union All Select 4,2 Union All Select 4,3


;with cte as(
SELECT
  c.Company_Name,
  ct.Team_Role_Recid,
  status = CASE WHEN ct.Team_Role_Recid = 1 then '1' else 'None Assigned' end
FROM  @Company c
LEFT JOIN  @Company_Team ct ON ct.Company_RecID = c.Company_RecID )

Select distinct Company_Name,Team_Role_Recid from (
SELECT Company_Name,Team_Role_Recid FROM cte WHERE Company_Name NOT IN (SELECT Company_Name FROM cte WHERE status='None Assigned')
Union All
SELECT Company_Name,'None Assigned' FROM cte WHERE status='None Assigned')x

结果

Company_Name Team_Role_Recid

Company1    None Assigned
Company2    None Assigned
Company3    1
Company4    None Assigned

仅从多个结果和组合中选择特定结果

3 个答案:

结果