SQL 常用的 增、删、改、查 还是牢记于心 噢

几个简单的基本的sql语句

 
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%’

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

 

 

 

初学者必须掌握滴