select ** from A where A.id in (select id from B where ****) 在以下哪种情况,select ** from A whereselect ** from A where A.id in (select id from B where ****) 在以下哪种情况,此语句执行的速度快：（1）A表的记录数远多于

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 * from a union select * from b 能详细说下么 select * into b from a where 11 select * from (select a.*,rownum aa from table a ) where aa=10 select *from A where A.a like '%1%'||'%' Please select a city or zipcode from the drop-down. Please select a plan from the options to the select * from book limit , insert into a select * from b 和select * into a from b 这两个语句是不是一样的? select id from (select id from pedigree group by number having count(name)>1)as a; 为啥用as a select c.*,d* from ( select 图号 from ( SELECT a.*,b.存货编码 FROM 未明图号 as a left OUTER JOIN 存select c.*,d* from ( select 图号 from (SELECT a.*,b.存货编码FROM 未明图号 as a left OUTER JOIN 存货档案 as bON a.图号=b.规 select from 表 和select from [表]有什么不同? select count(*) from 怎么使用 select count(1) from emp select * into dept2 from dept HQL 的语法：select a from a where a=3 or select b from b whereb=2 要怎么写? select * from tb1 a where =(select min(id2) from tb1 where id1=a.id1)其中的a该如何理解? 帮我看看这个oracle语句,select groupid,parentid,groupname,isleaf,description,sharerankid,statusid,corporationid,staffid,isactual,groupcount,level FROM (SELECT a.*,b.groupcount FROM teabgroup a,(SELECT groupid,count(*) groupcount FROM teabmembe