常用的数据库sql命令语句

跟数据库打交道的朋友，必须掌握SQL四条最基本的数据操作语句：Insert，Select，Update和Delete，熟练掌握SQL是数据库用户的宝贵财富，几个简单常用的基本的sql命令语句分享给大家。

选择：select * from table1 where 范围

插入：insert into table1(field1,field2) values(value1,value2)

删除：delete from table1 where 范围

更新：update table1 set field1=value1 where 范围

查找：select * from table1 where field1 like ’%value1%’ ---like的语法很精妙，查资料!

排序：select * from table1 order by field1,field2 [desc]

总数：select count * as totalcount from table1

求和：select sum(field1) as sumvalue from table1

平均：select avg(field1) as avgvalue from table1

最大：select max(field1) as maxvalue from table1

最小：select min(field1) as minvalue from table1