Question

我试图只获得两个季节中存在的行。在这两个季节中，产品具有相同的code 例如，在2016赛季，我在products表中有315个产品，2017年只有28个产品

以下查询提供315 + 28个产品。

SELECT *
FROM products P
INNER JOIN Season S ON S.id = P.id_season
WHERE P.active = 1
AND S.season IN ( 2016, 2017 )
ORDER BY P.code

我需要的是，查询应该只提供2017年的28种产品和2016年的28种产品，其代码与2017年的产品相同。

Answer 1

看起来像十字路口：

SELECT P.*
FROM products P
INNER JOIN Season S ON S.id = P.id_season
WHERE P.active = 1
AND S.season=2016
INTERSECT
SELECT P.*
FROM products P
INNER JOIN Season S ON S.id = P.id_season
WHERE P.active = 1
AND S.season=2017
ORDER BY P.code

或者，另一个方法。查找2016年的记录，从2017年开始查找并匹配代码：

SELECT * FROM
(
    SELECT *
    FROM products P
    INNER JOIN Season S ON S.id = P.id_season
    WHERE P.active = 1
    AND S.season=2016
) T1
JOIN
(
    SELECT *
    FROM products P
    INNER JOIN Season S ON S.id = P.id_season
    WHERE P.active = 1
    AND S.season=2017
) T2 ON T1.Code=T2.Code
ORDER BY T1.Code

Answer 2

您必须更改并调整：

SELECT *
FROM products P
INNER JOIN Season S ON S.id = P.id_season
WHERE P.active = 1
AND P.id_season IN ( 2016, 2017 )
ORDER BY P.code

Answer 3

SELECT *
FROM products P
INNER JOIN Season S ON S.id = P.id_season
WHERE P.active = 1
AND S.season IN ( 2017 )
Union All
SELECT *
FROM products
where active = 1
AND Prod_id in (
    SELECT Prod_Id FROM products P INNER JOIN Season S ON S.id = P.id_season
    WHERE  P.active = 1 AND S.season IN ( 2017 ) 
)

这有用吗？

从查询结果中过滤行

3 个答案: