• 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
  • insert into user_info set 姓名='李四',性别=1,年龄=29,身高=1.72
  • update user_info set 性别=1,年龄=27 where 姓名='世恒'
  • select * from user_info where 姓名='李四'
  • delete from user_info where 姓名='李四' and 性别=0
  • select * from user_info where 姓名 like '%李四%'