插入MySQL时可以跳过列吗?
如果第一列是AUTO_INCREMENT,则可以跳过该列并将值NULL放置。让我们首先创建一个表-
create table DemoTable ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentFirstName varchar(100), StudentAge int );
使用insert命令在表中插入一些记录。在这里,我们跳过了第一列,因为它是AUTO_INCREMENT-
insert into DemoTable values(NULL,'Robert',21); insert into DemoTable values(NULL,'Sam',22); insert into DemoTable values(NULL,'Bob',24); insert into DemoTable values(NULL,'Carol',20);
使用select语句显示表中的所有记录-
select *from DemoTable;
这将产生以下输出-
+-----------+------------------+------------+ | StudentId | StudentFirstName | StudentAge | +-----------+------------------+------------+ | 1 | Robert | 21 | | 2 | Sam | 22 | | 3 | Bob | 24 | | 4 | Carol | 20 | +-----------+------------------+------------+ 4 rows in set (0.00 sec)