如何将一个表中不匹配的行插入另一个表？

Question

我有两个结构相同的表

**t1**
+------+------+
| code |  vid |
+------+------+
| AAA  |   2  | - row1
| BBB  |   3  | - row2
| AAA  |   4  | - row3
| CCC  |   2  | - row4
+------+------+

**t2**
+------+------+
| code |  vid |
+------+------+
| AAA  |   2  | - row1
| BBB  |   3  | - row2
| AAA  |   4  | - row3
| CCC  |   3  | - row4
| DDD  |   4  | - row5
+------+------+

**Result table**
**t1**
+------+------+
| code |  vid |
+------+------+
| AAA  |   2  | - row1
| BBB  |   3  | - row2
| AAA  |   4  | - row3
| CCC  |   2  | - row4
| CCC  |   3  | - row5 New Inserted Row
| DDD  |   4  | - row6 New Inserted Row
+------+------+

我想从表2到表1插入新记录。行row4和row5是未匹配的行，我想在表1中添加。 我怎么能这样做？

提前致谢！

Answer 1

尝试此查询 -

INSERT INTO t1
  SELECT t2.* FROM t2
    LEFT JOIN t1
      ON t1.code = t2.code AND t1.vid = t2.vid
  WHERE t1.code IS NULL AND t1.vid IS NULL