查询语句select * from mzcfmx where to_date(rq,'yyyymmdd') between to_date('20140601','yyyymmdd') and to_date('20140630','yyyymmdd')假如还想在字段MXXM里查询注射用青霉素,注射用头孢拉定,注射用头孢噻肟呢?

oracle查询语句 select a||','||b||','||c from table where a in('m','n') oracle 中见到一个查询语句,select /*+ index(t1) */ from t1 .,其中/*+ Select all cus_name city from customer; Select all cus_name,city from customer; 有何不同?Select all cus_name city from customer; Select all cus_name,city from customer;这两条语句查询的结果为什么不一样?第二句的逗号有什么 求单表查询的hql语句怎么写sqL如下：select * from aaa20 where aaae2001 = '11111111';求hql语句写法 帮我写个联合查询语句写一条select语句,把title,area,year联合查询出来select year,area,title from film,filmtitle如果用这个查询语句,如何解决重复问题? 大侠这个查询语句的意思?大侠这个查询语句的意思是什么?sql=select DISTINCT 日期 from +tablename+ where 日期>=' +df +' and 日期 大侠这个查询语句的意思是什么?sql=select DISTINCT 日期 from +tablename+ where 日期>=' +df +' and 日期 查询语句中,共有三个部门：10,20,30,查询哪些雇员的工资高于所在部门的平均工资,请问三个命令的区别正确语句如下： SELECT deptno,ename,sal FROM emp outer WHERE sal>( SELECT avg(sal) SQL 语句 SELECT * FROM {{table}} WHERE `fleet_end_time` 求教一个mysql语句 select a.column1,tmp.column1 from a ,(select * from b where ...) where ...求教一个mysql语句select a.column1,tmp.column1 from a ,(select * from b where ...) as tmp where ...tmp相当于从另一个表查询出的结果建 select max(account_id ) from(select top 5 account_id from account)子查询没起作用为什么? oracle查询一个表,select * from a 所有的字段都是浮点型,想保留3个小数,怎么写语句?类似select round(*,3) from a,还是怎么写? where中的+是啥意思啊?今天看到一个查询语句:select d.sp_id,d.sp_id from wegpid.t_symbol d,wegpid.t_representation swhere d.sp_id=s.sp_id(+) select * from (select * from 表名) 这样的语法中括号里的查询语句是什么意思.为什么不直接from表名select M.* ,case when M.num>1 then M3.Edescs else M3.Edesc end fqtyut,M3.Edesc fpriceut,M4.tradec fcountryfrom (SELECT INVNO,HS 数据库SQL语句中 查询选修了全部课程的学生的学号和姓名 查询选修了全部课程的学生姓名.SELECT SnameFROM StudentWHERE NOT EXISTS（SELECT *FROM CourseWHERE NOT EXISTS(SELECT *FROM SCWHERE Sno= Student.SnoAND Cno= Cours 查询语句select * from mzcfmx where to_date(rq,'yyyymmdd') between to_date('20140601','yyyymmdd') and to_date('20140630','yyyymmdd')假如还想在字段MXXM里查询注射用青霉素,注射用头孢拉定,注射用头孢噻肟呢? 帮我解释下这个查询语句@select c_id,c_gcode,c_number into #11 from tb_bill_rg where c_id in(select c_id from tb_bill_r where datediff(day,c_au_time,'2007-04-01')=0 and c_ad_from like '2%') and c_gcode not in(select c_gcode from tb_d_sum_gds oracle 子查询:select *,(select account from t_ps_member m where m.mid = po.mid) account from t_ps