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mysql> select 'name',id from table_b; //'name' 不在table_b表中
+------+-----------+
| name | id |
+------+-----------+
| name | 123456 |
| name | 1234567 |
| name | 12345678 |
| name | 123456789 |
+------+-----------+
4 rows in set (0.00 sec)
</div> </div>
+------+-----------+
| name | id |
+------+-----------+
| name | 123456 |
| name | 1234567 |
| name | 12345678 |
| name | 123456789 |
+------+-----------+
4 rows in set (0.00 sec)
</div> </div>