sql - 选择中的自动排序

Question

我有一个程序在时间示例之间返回每日报告(CreateDate BETWEEN '2012/1/21' AND '2012/2/19')

我想要这个结果

1/21
1/22
1/23
.
2/1
.
.

但是输出是按天自动排序的!!如下:

2/1
2/2
.
2/15
1/21
1/22
1/23
.
.

我不能使用 order by (createdate) 因为我有这个选择:

SELECT     COUNT(UserId) AS c, DAY(CreateDate) AS d
FROM       dbo.aspnet_Membership
WHERE     (CreateDate BETWEEN '2012/1/21' AND '2012/2/19')
GROUP BY DAY(CreateDate)

Answer 1

如果你想按月和日排序，那么你当然需要月份。

而且你总是需要一个 ORDER BY 来保证结果顺序。

SELECT     COUNT(UserId) AS c, MONTH(CreateDate) AS m, DAY(CreateDate) AS d
FROM       dbo.aspnet_Membership
WHERE     (CreateDate BETWEEN '2012/1/21' AND '2012/2/19')
GROUP BY  MONTH(CreateDate) AS m, DAY(CreateDate) AS d
ORDER BY  MONTH(CreateDate) AS m, DAY(CreateDate) AS d

在这种情况下，您得到的顺序是巧合，因为 GROUP BY(这意味着 MySQL 中的 ORDER BY，而不是其他 RDBMS)