为了在 INSERT INTO 语句中不指定列名的情况下在列中插入值，我们必须给出与表中的列数匹配的值的数量，同时还要注意该列的数据类型.
mysql> Insert into student values(100,'Gaurav','Ph.D');
Query OK, 1 row affected (0.08 sec)
mysql> Select * from student;
+--------+--------+--------+
| RollNO | Name | Class |
+--------+--------+--------+
| 100 | Gaurav | Ph.D |
+--------+--------+--------+
1 row in set (0.00 sec)
mysql> Insert into student values(200,'Rahul','Ph.D'),(300,'Aarav','B.tech');
Query OK, 2 rows affected (0.12 sec)
Records: 2 Duplicates: 0 Warnings: 0
mysql> Select * from student;
+--------+--------+--------+
| RollNO | Name | Class |
+--------+--------+--------+
| 100 | Gaurav | Ph.D |
| 200 | Rahul | Ph.D |
| 300 | Aarav | B.tech |
+--------+--------+--------+
3 rows in set (0.00 sec)
如果我们不关心列的总数及其数据类型，MySQL 会抛出错误，如下所示 -
mysql> Insert into student values(400,'Raman',M.Tech);
ERROR 1054 (42S22): Unknown column 'M.Tech' in 'field list'
mysql> Insert into student values(400,'Raman');
ERROR 1136 (21S01): Column count doesn't match value count at row 1
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