如何在 MySQL Insert 語句中新增 where 子句?
你需要為此使用 UPDATE 語句。
語法如下
update yourTableName set yourColumnName1=yourValue1,yourColumnName2=yourValue2,....N where yourCondition;
讓我們為我們的示例建立一個表
mysql> create table addWhereClauseDemo -> ( -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentName varchar(30), -> StudentPassword varchar(40) -> ); Query OK, 0 rows affected (0.45 sec)
使用 insert 命令向表中插入一些記錄。
查詢如下
mysql> insert into addWhereClauseDemo(StudentName,StudentPassword) values('John','John123456'); Query OK, 1 row affected (0.14 sec) mysql> insert into addWhereClauseDemo(StudentName,StudentPassword) values('Carol','99999'); Query OK, 1 row affected (0.24 sec) mysql> insert into addWhereClauseDemo(StudentName,StudentPassword) values('Bob','OO7Bob'); Query OK, 1 row affected (0.16 sec) mysql> insert into addWhereClauseDemo(StudentName,StudentPassword) values('David','David321'); Query OK, 1 row affected (0.26 sec)
使用 select 語句顯示錶中的所有記錄。
查詢如下
mysql> select *from addWhereClauseDemo;
輸出如下
+-----------+-------------+-----------------+ | StudentId | StudentName | StudentPassword | +-----------+-------------+-----------------+ | 1 | John | John123456 | | 2 | Carol | 99999 | | 3 | Bob | OO7Bob | | 4 | David | David321 | +-----------+-------------+-----------------+ 4 rows in set (0.00 sec)
以下是如何新增 where 子句,即更新記錄的查詢
mysql> update addWhereClauseDemo -> set StudentName='Maxwell',StudentPassword='Maxwell44444' where StudentId=4; Query OK, 1 row affected (0.18 sec) Rows matched: 1 Changed: 1 Warnings: 0
讓我們再次檢查表記錄。
查詢如下
mysql> select *from addWhereClauseDemo;
輸出如下
+-----------+-------------+-----------------+ | StudentId | StudentName | StudentPassword | +-----------+-------------+-----------------+ | 1 | John | John123456 | | 2 | Carol | 99999 | | 3 | Bob | OO7Bob | | 4 | Maxwell | Maxwell44444 | +-----------+-------------+-----------------+ 4 rows in set (0.00 sec)
廣告