在没有给出列名和值的情况下运行 INSERT INTO 语句时 MySQL 返回什么？
当我们运行 INSERT INTO 语句而不给出列名和值时，MySQL 会将 NULL 存储为表列的值。考虑下面给出的示例，其中我们使用以下查询创建了一个表“Student” -
mysql> Create table Student(RollNO INT, Name Varchar(20), Class Varchar(15)); Query OK, 0 rows affected (0.17 sec)登录后复制
mysql> Insert into Student() Values(); Query OK, 1 row affected (0.02 sec)登录后复制
mysql> Select * from Student; +--------+------+-------+ | RollNO | Name | Class | +--------+------+-------+ | NULL | NULL | NULL | +--------+------+-------+ 1 row in set (0.00 sec)登录后复制
mysql> Insert into Student() Values(); Query OK, 1 row affected (0.03 sec) mysql> Select * from Student; +--------+------+-------+ | RollNO | Name | Class | +--------+------+-------+ | NULL | NULL | NULL | | NULL | NULL | NULL | +--------+------+-------+ 2 rows in set (0.00 sec)登录后复制
