mysql > select name, id from table_b; //‘name’ is not in the table_b table +------+-----------+ | name | id | +------+-----------+ | name | 123456 | | name | 1234567 | | name | 12345678 | | name | 123456789 | +------+-----------+ 4 rows in set (0.00 sec)

mysql> insert into table_a(name,b_refer) select 'name', id from table_b; //'name'  Not in table_b In the table
Query OK, 4 rows affected (0.03 sec)