Mysql学习心得之插入、更新、删除记录_MySQL
下面通过图文并茂的方式给大家详解Mysql学习心得之插入、更新、删除记录。
插入记录
代码如下:
Insert[]into] tb1_name[(col_name,…..)]
自动编号的字段,可以用values default
Default 可以赋予默认值
代码如下:
INSERT USERS VALUES(NULL,'TOM','123',25,1);
可以同时插入多条记录
代码如下:
INSERT users VALUES(DEFAULT,'TOM','123',3*7-5,1),(NULL,'ROSE',MD5('123'),DEFAULT,0);
代码如下:
INSERT users SET username='Ben',password='456'; (但只能插入单条记录)
单表更新
代码如下:
UPDATE users SET age =age-id ,sex=0;
代码如下:
UPDATE users SET age=age+10 WHERE id%2=0;
Id%2=0 (id字段除以2的余数为0)
删除字段 delete
代码如下:
DELETE FROM users WHERE id =5;
再插入一条新记录id自动编号为6,而不是已删除的5

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