常用的几条sql语句

常用的几条sql语句

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• 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