定义：sql 语句就是对数据库进行操作的一种语言。
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%’ （所有包含‘value1’这个模式的字符串）like的语法很精妙，查资料!
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[separator]
Sql语句大全.rar
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