1. 说明：复制表(只复制结构，源表名：a，新表名：b)
- select * into b from a where 1<>1
2. 说明：拷贝表(拷贝数据，源表名：a，目标表名：b)
- insert into b(a, b, c) select d, e, f from b
3. 说明：显示文章、提交人和最后回复时间
- select a.title, a.username, b.adddate from table a,(select max(adddate) adddate from table where table.title=a.title) b
4. 说明：外连接查询(表名1：a，表名2：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
5. 说明：日程安排提前五分钟提醒
- select * from 日程安排 where datediff(''minute'', f开始时间, getdate())>5
6. 说明：两张关联表，删除主表中已经在副表中没有的信息
- delete from info where not exists(select * from infobz where info.infid=infobz.infid)
7. 说明：——
- 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;
8. 说明：——
- 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
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