if exists (select 1 from #tmp_dj_xsg212 WHERE shangplx LIKE '%冷%'

if exists (select 1 from #tmp_dj_xsg212 WHERE shangplx LIKE '%冷%' // IF EXISTS (SELECT name FROM m if not exists(select 1 from sysobjects where type='U' and name='staffinfo')有什么作用? if not exists (SELECT * From TA_ARTIFICER Where ARTID = @Artid)是什么意思?为什么要用到if not exists呢?在什么时候要用到 if not exists（）?它的作用是什么? oracle exists函数用法select A.DEPTNO,A.NAME FROM A WHERE EXISTS (SELECT 1 FROM B WHERE A.DEPTNO=B.DEPTNO)中的SELECT 不会是查找是1的值吧? insert into REC_OVER(ORG_ID) select '1' from dual where not exists (select ORG_ID from REC_OVER )insert into REC_OVER(ORG_ID) select '1' from dual where not exists (select ORG_ID from REC_OVER ) 请问oracle里这样的语句,为什么在sql/plus可 exists是什么意思啊exists(select * from WE_Contract_Detail_Electricity where ContractID=@ContractID) exists ERROR:- User ID already exists.Please try another one - E-mail address already exists.Please tryERROR:- User ID already exists.Please try another one- E-mail address already exists.Please try another one- Select your country.怎么翻译? SQL关于IN和EXISTS的区别?请问2者到底有什么区别啊?select MC001 from BOMMC WHERE MC001 NOT IN (SELECT MD001 FROM BOMMD)和select MC001 from BOMMC WHERE MC001 NOT EXISTS (SELECT MD001 FROM BOMMD)2个IN查出来是80,而EXISTS查出来是 if exists 括号后的条件如何写 select top 1 select count (1)V_COUNT := 0;SELECT COUNT(1) INTO V_COUNT FROM CUST WHERE CUST_ID = ARG_CUST_ID;IF V_COUNT = 0 THEN我是个初学者,今有如上这么一段程序,里面select count(1)是什么意思? SELECT 在数据库中IF 和 IF EXISTS 有什么区别IF (条件)BEGIN语句快END和下面有什么区别?IF EXISTS (条件)BEGIN语句快END if (pastart = -1) sql.append(select * from(); sql.append(select nid,sname,sdescription,nprice,sif (pastart = -1)sql.append(select * from();sql.append(select nid,sname,sdescription,nprice,simg,(CASE smctag WHEN '0' THEN '有货'WHEN '1' THEN ' SQL查询选修了全部课程的学生姓名查询选修了全部课程的学生姓名：student 是学生表 course 是选课表 sc 是课程表select snamefrom studentwhere not exists（select *from coursewhere not exists (select *from scwhere sn 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