我的表包含以下字段:
id | date_from | date_to | price
--------------------------------------------
CK1 22-12-2012 29-12-2012 800
CK1 22-12-2012 29-12-2012 1200
CK2 22-12-2012 29-12-2012 1400
CK2 22-12-2012 29-12-2012 1800
CK2 22-12-2012 29-12-2012 2200
如何创建SQL选择按ID,DATE_FROM,DATE_TO分组结果并从价格中选择最低值。
结果将是
CK1 22-12-2012 29-12-2012 800
CK2 22-12-2012 29-12-2012 1400
答案 0 :(得分:22)
select id, date_from, date_to, min(price)
from table
group by id, date_from, date_to
答案 1 :(得分:4)
像这样:
SELECT id, date_from, date_to, MIN(price)
FROM TableName
GROUP BY id, date_from, date_to
答案 2 :(得分:4)
如果您的dbms支持cte,那么您可以这样做;
测试数据
DECLARE @tbl TABLE
(
id VARCHAR(100),
date_from VARCHAR(100),
date_to VARCHAR(100),
price INT
)
INSERT INTO @tbl
VALUES
('CK1','22-12-2012','29-12-2012',800),
('CK1','22-12-2012','29-12-2012',1200),
('CK2','22-12-2012','29-12-2012',1400),
('CK2','22-12-2012','29-12-2012',1800),
('CK2','22-12-2012','29-12-2012',2200)
<强>查询强>
;WITH CTE
AS
(
SELECT
RANK() OVER(PARTITION BY id ORDER BY price ASC) AS RowNbr,
tbl.*
FROM
@tbl AS tbl
)
SELECT
*
FROM
CTE
WHERE
CTE.RowNbr=1
答案 3 :(得分:0)
SELECT id, date_from, date_to, min(price)
FROM my_table
GROUP BY id, date_from, date_to