我正在使用旧的SQL Server 2000。
以下是一些示例数据:
ROOMDATE rate bus_id quantity
2018-09-21 00:00:00.000 129 346686 2
2018-09-21 00:00:00.000 162 354247 36
2018-09-21 00:00:00.000 159 382897 150
2018-09-21 00:00:00.000 120 556111 25
2018-09-22 00:00:00.000 129 346686 8
2018-09-22 00:00:00.000 162 354247 86
2018-09-22 00:00:00.000 159 382897 150
2018-09-22 00:00:00.000 120 556111 25
2018-09-23 00:00:00.000 129 346686 23
2018-09-23 00:00:00.000 162 354247 146
2018-09-23 00:00:00.000 159 382897 9
2018-09-23 00:00:00.000 94 570135 23
基本上我想要的是每天的最大数量及其相应的费率和bus_id。
例如,我希望上面的示例数据中包含以下行:
ROOMDATE rate bus_id quantity
2018-09-21 00:00:00.000 159 382897 150
2018-09-22 00:00:00.000 159 382897 150
2018-09-23 00:00:00.000 162 354247 146
答案 0 :(得分:1)
据我了解,SQL Server 2000不支持ROW_NUMBER
。但是我们可以使用子查询来表达您的查询,该子查询可以找到每天的最大数量:
SELECT t1.*
FROM yourTable t1
INNER JOIN
(
SELECT
CONVERT(char(10), ROOMDATE, 120) AS ROOMDATE,
MAX(quantity) AS max_quantity
FROM yourTable
GROUP BY CONVERT(char(10), ROOMDATE, 120)
) t2
ON CONVERT(char(10), t1.ROOMDATE, 120) = t2.ROOMDATE AND
t1.quantity = t2.max_quantity
ORDER BY
t1.ROOMDATE;