GoLang教程 | 160 | 0 | +----+-----------+-----------------------+-------+----------+ 5 rows in set (0.02 sec) mysql> SELECT * FROM product_price; +----+-----------+-------+ | id | productid | price | +----+-----------+-------+ | 1 | 1001 | NULL | | 2 | 1002 | NULL | | 3 | 1003 | NULL | | 4 | 1004 | NULL | | 5 | 1005 | NULL | +----+-----------+-------+ 5 rows in set (0.01 sec)