常用sql语句

创建库creat database database-name

删除库drop database dbname

创建表create table tabname(col1 type1 [not null] [primary key],col2 type2 [not null],..)

删除表drop table tabname

添加列Alter table tabname add column col type

添加主键Alter table tabname add primary key(col)

创建视图create view viewname as select statement

删除视图drop view viewname

--查询：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

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

--分组：select sex,sum(*) from table1 where age>20 group by sex

--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

--between用法：select * from table1 where time between time1 and time2

--in用法：select * from table1 where a [not] in (‘值1’,’值2’,’值4’,’值6’)