如何将具有相同ID的多个行合并为一行。
我有桌子:
+----+------+------+------+
| ID | A | B | C |
+----+------+------+------+
| 1 | 123 | 31 | 456 |
| 1 | 412 | NULL | 1 |
| 2 | 567 | 38 | 4 |
| 2 | 567 | NULL | NULL |
| 3 | 2 | NULL | NULL |
| 3 | 5 | NULL | NULL |
| 4 | 6 | 1 | NULL |
| 4 | 8 | NULL | 5 |
| 4 | NULL | NULL | 5 |
+----+------+------+------+
我想要桌子: 我有桌子:
+----+-----+------+------+-----+------+------+------+------+----+
| ID | A | B | C | A2 | B2 | C2 | A3 | B3 | C3 |
+----+-----+------+------+-----+------+------+------+------+----+
| 1 | 123 | 31 | 456 | 412 | NULL | 1 | | | |
| 2 | 567 | 38 | 4 | 567 | NULL | NULL | | | |
| 3 | 2 | NULL | NULL | 5 | NULL | NULL | | | |
| 4 | 6 | 1 | NULL | 8 | NULL | 5 | NULL | NULL | 5 |
+----+-----+------+------+-----+------+------+------+------+----+
答案 0 :(得分:0)