给定以下填充的x,y坐标:
0, 0
0, 1
0, 2
1, 0
1, 1
1, 2
2, 0
2, 1
2, 2
4, 0
4, 1
5, 0
5, 1
如何编写SQL查询以确定所有填充的矩形？矩形由其左上角和右下角定义.
期望的结果
x1 | y1 | x2 | y2
0 0 2 2
0 4 1 5
因为
+---+---+---+---+
| | 0 | 1 | 2 |
+---+---+---+---+
| 0 | X | X | X |
| 1 | X | X | X |
| 2 | X | X | …