城杆

SQL: select * into b from a where 1<>1;

SQL: insert into b(a, b, c) select d, e, f from b;

select a.title, a.username, b.adddate  
from table a,(
select max(adddate) adddate  
from table where table.title=a.title) b

select a.a, a.b, a.c, b.c, b.d, b.f  
from a LEFT OUT JOIN b ON a.a = b.c;

select *  
from 日程安排  
where datediff(''minute'', f开始时间, getdate())>5 　

delete from info  
where not exists(
select *  
from infobz  
where info.infid=infobz.infid );

SELECT A.NUM, A.NAME, B.UPD_DATE, B.PREV_UPD_DATE  
FROM TABLE1,(SELECT X.NUM, X.UPD_DATE, Y.UPD_DATE PREV_UPD_DATE  
FROM (SELECT NUM, UPD_DATE, INBOUND_QTY, STOCK_ONHAND  
FROM TABLE2  
WHERE TO_CHAR(UPD_DATE,''YYYY/MM'') =  
TO_CHAR(SYSDATE, ''YYYY/MM'')) X,  
(SELECT NUM, UPD_DATE, STOCK_ONHAND  
FROM TABLE2  
WHERE TO_CHAR(UPD_DATE,''YYYY/MM'') =  
TO_CHAR(TO_DATE(TO_CHAR(SYSDATE, ''YYYY/MM'')  
|| ''/01'',''YYYY/MM/DD'') - 1, ''YYYY/MM'') ) Y,  
WHERE X.NUM = Y.NUM （+）AND X.INBOUND_QTY  
+ NVL(Y.STOCK_ONHAND,0) <> X.STOCK_ONHAND ) B  
WHERE A.NUM = B.NUM;　

select *  
from studentinfo  
where not exists(select * from student where studentinfo.id=student.id)  
and 系名称=''"&strdepartmentname&"''
and 专业名称=''"&strprofessionname&"''
order by 性别, 生源地, 高考总成绩;