您需要为此使用UPDATE语句。
语法如下
update yourTableName set yourColumnName1=yourValue1,yourColumnName2=yourValue2,....N where yourCondition;
让我们为我们的示例创建一个表
create table addWhereClauseDemo -> ( -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentName varchar(30), -> StudentPassword varchar(40) -> );
使用insert命令在表中插入一些记录。
查询如下
insert into addWhereClauseDemo(StudentName,StudentPassword) values('John','John123456'); insert into addWhereClauseDemo(StudentName,StudentPassword) values('Carol','99999'); insert into addWhereClauseDemo(StudentName,StudentPassword) values('Bob','OO7Bob'); insert into addWhereClauseDemo(StudentName,StudentPassword) values('David','David321');
使用select语句显示表中的所有记录。
查询如下
select *from addWhereClauseDemo;
以下是输出
+-----------+-------------+-----------------+ | StudentId | StudentName | StudentPassword | +-----------+-------------+-----------------+ | 1 | John | John123456 | | 2 | Carol | 99999 | | 3 | Bob | OO7Bob | | 4 | David | David321 | +-----------+-------------+-----------------+ 4 rows in set (0.00 sec)
这是添加where子句的查询,即更新记录
update addWhereClauseDemo -> set StudentName='Maxwell',StudentPassword='Maxwell44444' where StudentId=4; Rows matched: 1 Changed: 1 Warnings: 0
让我们再次检查表记录。
查询如下
select *from addWhereClauseDemo;
以下是输出
+-----------+-------------+-----------------+ | StudentId | StudentName | StudentPassword | +-----------+-------------+-----------------+ | 1 | John | John123456 | | 2 | Carol | 99999 | | 3 | Bob | OO7Bob | | 4 | Maxwell | Maxwell44444 | +-----------+-------------+-----------------+ 4 rows in set (0.00 sec)