MYSQL组按开始，结束时间计数

Question

我想要一个看起来像这样的数据库：

| Start      | End         |
|------------|-------------|
| 15:00:00   |    18:00:00 |
| 15:00:00   |    19:00:00 |
| 15:00:00   |    18:00:00 |
| 16:00:00   |    19:00:00 |
| 17:00:00   |    21:00:00 |
| 17:00:00   |    21:00:00 |

并获得一个返回此的查询

| Start      | End         | Count |
|------------|-------------|-------|
| 15:00:00   |    18:00:00 |   2   |
| 15:00:00   |    19:00:00 |   1   |
| 16:00:00   |    19:00:00 |   1   |
| 17:00:00   |    21:00:00 |   2   |

有什么建议？如何按开始和结束时间分组，然后计算它们？

Answer 1

Select `Start`, `End`, Count(*) as ct FROM table GROUP BY `Start`,`End`

应该做的伎俩？

Answer 2

使用此查询

SELECT Start, End, COUNT(*) FROM TableName GROUP BY Start, End