1、新建表create table

create table Person3(Number varchar(20),Age int)

2、数据插入insert into

insert into Person3(number,name) values('IT001','小明')

3、数据更新（修改）update set

update Person3 set age=30

4、数据检索select

select * from Person3

select number as 编号,NAME as 姓名,Salary+10000 as 月薪from Person3;-- as 用来给列名起别名

5、聚合函数

count()、max()、min()、avg()、sum()

6、数据排序order by

select * from Person3

where age>25 and age<=30

order by age ASC;  --注：order by 子句要放在where 子句之后

7通配符过滤'_', '%'

select * from Person3 where name like'_erry'  --检索以任意字符开头,剩余部分为"erry"的数据

select * from Person3 where name like'%n%' --检索name中包含字符n的

8空值处理isnull/ is not null

select * from Person3

where name is not null --is not null 判断name不为null的数据

9多值匹配 in

select * from Person3

where age in(27,28,35)  --age 为27或28或35的

10数据分组group by

select age,avg(salary) from Person3

group by age   --根据age进行分组

11Having子句

select age,count(*)as 人数from person3

group by age

having count(*)>1 --having必须放在group by之后，having只能对分组后的数据进行过滤

了解一下，有备无患！

{:soso_e142:}

值得学习ing!