程式功能
創建資料庫
CREATE DATABASE database-name
刪除資料庫
drop database dbname
創建新表
create table tabname(col1 type1 [not null] [primary key],col2 type2 [not null],..)
刪除新表
drop table tabname
增加一個列
Alter table tabname add column col type
添加主鍵
Alter table tabname add primary key(col)
刪除主鍵
Alter table tabname drop primary key(col)
創建索引
create [unique] index idxname on tabname(col….)
刪除索引
drop index idxname
創建視圖
create view viewname as select statement
刪除視圖
drop view viewname
常見語句
更新：update table1 set field1=value1 where 範圍
查找：select * from table1 where field1 like ’%value1%’ （所有包含‘value1’這個模式的字元串）
排序：select * from table1 order by field1,field2 [desc]
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[separator]
