select distinct id from names where tid = 'AREACODE' And dsc like '%' || v_areacode其中dsc like '%' || v_areacode

sql如何取交集有这样两条sql语句select distinct id from a where id='123'select distinct id from a where id='456'我希望能把他们取得他们记录的交集,sql语句该如何写?错了 应该是这样的select distinct temid from a whe select distinct id from names where tid = 'AREACODE' And dsc like '%' || v_areacode其中dsc like '%' || v_areacode select min(name) from tableselect * from table where id in (select min(id) from table group by name)那这样的话我是不是可以理解为他可以 完成 DISTINCT一样的效果呢? select distinct A.* from A,B where A.id = B.g_id and A.fwzid = 2 我那个地方是写的 select distinct A.* from A,B where A.id B.g_id and A.fwzid = 2 好像就会出错, sql中left join from 多个表怎么写select * from a,b,c,d LEFT JOIN e on e.id=a.id left join f on f.id=c.id现在这句是错的,怎么写才正确 distinct 这句SQL语句是什么意思.ql=select distinct(selabel) from.sql=select distinct(selabel) from kcwl_labprosellog where isdel=0 &sqlfile& and selabel not in (select distinct(selabel) from kcwl_labprosell) 这个语句是什么作用的.说具 $query = mysql_query( select * from 表名 where id='$_GET[id]' )中'$_GET[id]'是什么意思? 这样的SQL select语句怎么写?怎么显示数据 distinct,order by,group by,having?这是我的数据：id addr temperature voltage others date_time 1335 0001 75.2 2.6 024 2010-11-13 19:45:151336 0002 75.3 2.6 024 2010-11-13 19:45:16 1337 0002 7 下面是张F表ID NAME12 ll23 mm34 dd45 cc56 ff要结果出来就是CC =ID与NAME并联12ll23mm34dd45cc56ff这个SELECT 语句要如何写 假设这个表是F select * from teacher where s_id in(select s_id from student) s_id栏位在student表中无,但是不报错建立如下两个表student(id,name)teacher(id,name,s_id)为什麽以下这个SQL不报错,S_ID栏位在student表中根本不存在select * f select telnum,count(0),count(distinct othertelnum) from nmk.ljdx_cdr_temp group by telnum select distinct 院系编号=substring(stud_id,4,2) from stud_info 是什么意思 SQL里的DISTINCT什么意思SELECT Sno,AVG(Grade)FROM SCGROUP BY SnoHAVING COUNT(DISTINCT(Sno))>1;既然已经按Sno分类了,再用DISTINCT那HAVING COUNT(DISTINCT(Sno))的值岂不是只能为1? select id,name from student where id in ( select id from score having count(id)>=2 );以上这段语句有没语法错误.SQL语句 请问sql=select * from 招聘信息 order by id select id from (select id from pedigree group by number having count(name)>1)as a; 为啥用as a 请问sql语句“Select Distinct”是什么意思?可不可以讲一下它的用法1.Select Distinct 货品编码,数量 From 订单信息2.Select Distinct 货品编码 From 订单信息第一句和第二句有什么分别,请高手说说Distinct