[英]How to get the top 1 row from second table while joining two tables : SQL Server 2014
您可以使用cross apply
。 条件还不清楚,但是想法是:
select t1.*, t2.images
from table1 t1 cross apply
(select top (1) t2.*
from t2
where t2.? = t1.id
) t2;
我推测相关条件应使用t2.h_id
或t2.id
那是你在找什么
WITH T1 AS
(
SELECT 1 ID,
'Anto' Name,
'Manager' Position
UNION
SELECT 2,
'Nick',
'CEO'
)
, T2 AS
(
SELECT 1 ID,
1 H_ID,
'URL1' Images
UNION
SELECT 2,
1,
'URL2'
UNION
SELECT 3,
1,
'URL3'
)
SELECT *
FROM T1 CROSS JOIN (SELECT TOP 1 Images FROM T2 ORDER BY ID) TT
要么
SELECT TOP 1
T1.*,
T2.Images
FROM T1 INNER JOIN T2
ON T1.ID = T2.H_ID
ORDER BY T2.ID;
试试这个
SELECT *
FROM T1, T2
WHERE T1.ID = T2.H_ID
AND NOT EXISTS(
SELECT *
FROM T2 as T2BIS -- just an alias table
WHERE T2BIS.H_ID = T1.ID -- usual join
AND T2.ID > T2BIS.ID --change operator to take the last instead of the first
)
这是一个通用的解决方案,当您在条件和EXISTS / NOT EXISTS子句(仅两个相同空间之间的分隔)定义条件时调整子查询时,可以在许多情况下使用。
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