MySQL插入值到特定的行和列
让我们首先创建一个表-
create table DemoTable1569 -> ( -> StudentId varchar(10), -> StudentName varchar(20) -> );
使用插入命令在表中插入一些记录-
insert into DemoTable1569 values('John_12','John Smith');
insert into DemoTable1569 values('David_321','Carol Taylor');
insert into DemoTable1569 values('David_989','David Miller');使用select语句显示表中的所有记录-
select * from DemoTable1569;
这将产生以下输出
+-----------+--------------+ | StudentId | StudentName | +-----------+--------------+ | John_12 | John Smith | | David_321 | Carol Taylor | | David_989 | David Miller | +-----------+--------------+ 3 rows in set (0.00 sec)
这是将值插入到特定行和列的查询。
update DemoTable1569 set StudentId='Carol_321' where StudentName='Carol Taylor'; Rows matched: 1 Changed: 1 Warnings: 0
让我们再次检查表记录。
select * from DemoTable1569;
这将产生以下输出
+-----------+--------------+ | StudentId | StudentName | +-----------+--------------+ | John_12 | John Smith | | Carol_321 | Carol Taylor | | David_989 | David Miller | +-----------+--------------+ 3 rows in set (0.00 sec)