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MySQL基本数据操作_MySQL

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2016-06-01 12:59:56990browse

创造数据(插入数据)

<code class=" hljs sql">insert into 表名(字段列表) valuse(值列表);

insert into exam_student(stu_name,stu_no) values('xiaoming','1205040219');

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如果需要在插入数据时,为所有的字段设置值,那么可以省略字段列表,要求与表中的字段顺序一致。

insert into exam_student values('zhangsan','3203423',100);

获得数据(查询数据)

<code class=" hljs sql">select 字段列表 from 表名 查询条件;

字段列表可以使用*代替,表示所有的字段。查询条件可以省略,表示所有的记录都获得,相当于where 1;

select stu_name,stu_no from exam_student;

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<code class=" hljs sql">alter table exam_student add stu_score int;
select * from exam_student;

有条件的查找:

<code class=" hljs sql">select * from exam_student where stu_age>50;

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删除数据

<code class=" hljs sql">delete from 表名 条件;
删除需要在逻辑上严格给条件,否则容易造成数据误操作,导致损失。
语法上可以没有where。
delete from exam_student where stu_age>50;

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修改数据

<code class=" hljs sql">update 表名 set 字段=新值,··· 条件;

update exam_student set stu_age=88 where stu_age<=50;

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