Question

我想从products表中选择行。产品基于season。

每个产品row/entity都包含一个名为id_season

的列

和seasons表看起来像

id | season_name | active | created | modified

季节名称是2016,2017,2018年...

我想选择2016年和2017年具有相同code

的所有产品

我有一个简单的选择，如

SELECT *
FROM products P
INNER JOIN seasons S ON S.id = P.id_season
WHERE S.active = 1
AND S.season_name IN ( YEAR(GETDATE()), YEAR(GETDATE()) + 1  )

但不知道如何改进它，以匹配不同季节的产品代码。

Answer 1

尝试使用以下代码..

;WITH cte_1
AS
(SELECT *,COUNT(p.code) OVER(partition by p.code Order by  p.code) cnt
 FROM products P
   INNER JOIN seasons S ON S.id = P.id_season
WHERE S.active = 1
AND S.season_name IN ( YEAR(GETDATE()), YEAR(GETDATE()) + 1  )) -- or simply put IN ('2016','2017')
SELECT *
FROM cte_1
WHERE cnt>1

或者您可以使用如下的子查询格式。

SELECT *
FROM
(SELECT *,COUNT(p.code) OVER(partition by p.code Order by  p.code) cnt
 FROM products P
   INNER JOIN seasons S ON S.id = P.id_season
WHERE S.active = 1
AND S.season_name IN ( YEAR(GETDATE()), YEAR(GETDATE()) + 1  )) t
WHERE  t.nt>1

Answer 2

您可以使用内部查询，如下所示：

 SELECT * FROM products
 where id_season in (Select id from seasons where
 season_name IN ( YEAR(GETDATE()), YEAR(GETDATE()) + 1  ));

从产品表中选择产品

2 个答案: