| 1. 说明：复制表(只复制结构，源表名：a，新表名：b)
| SQL: 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)
| SQL: 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
SQL: 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)
SQL: 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
SQL: 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
SQL: delete from
info
where not exists(select * from infobz
where info.infid=infobz.infid ); |
7. 说明：——
SQL: 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：——
SQL: 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; |
|