案例

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insert into new_trends(namestring,detstring,begindate) values('sheng1','没有做不到的,只有想不到的.',now()) 

delete from new_trends where id=1

update new_trends set namestring='lrstom',detstring='不再犹豫' where id=3 

select id,namestring,detstring,begindate from new_trends order by id desc limit 0,5 

select id,namestring,detstring,begindate from new_trends where namestring like '%en%' order by id desc 

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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

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