1.用一條SQL語句 查詢出每門課都大于80分的學生姓名
name kecheng fenshu
張三 語文 81
張三 數學 75
李四 語文 76
李四 數學 90
王五 語文 81
王五 數學 100
王五 英語 90
A: select distinct name from table where name not in (select distinct name from table where fenshu<=80)
2.學生表 如下:
自動編號 學號 姓名 課程編號 課程名稱 分數
1 2005001 張三 0001 數學 69
2 2005002 李四 0001 數學 89
3 2005001 張三 0001 數學 69
刪除除了自動編號不同,其他都相同的學生冗余信息
A: delete tablename where 自動編號 not in(select min(自動編號) from tablename group by 學號,姓名,課程編號,課程名稱,分數)
一個叫department的表,里面只有一個字段name,一共有4條紀錄,分別是a,b,c,d,對應四個球對,現在四個球對進行比賽,用一條sql語句顯示所有可能的比賽組合.
你先按你自己的想法做一下,看結果有我的這個簡單嗎?
答:select a.name, b.name
from team a, team b
where a.name < b.name
請用SQL語句實現:從TestDB數據表中查詢出所有月份的發生額都比101科目相應月份的發生額高的科目。請注意:TestDB中有很多科目,都有1-12月份的發生額。
AccID:科目代碼,Occmonth:發生額月份,DebitOccur:發生額。
數據庫名:JcyAudit,數據集:Select * from TestDB
答:select a.*
from TestDB a
,(select Occmonth,max(DebitOccur) Debit101ccur from TestDB where AccID='101' group by Occmonth) b
where a.Occmonth=b.Occmonth and a.DebitOccur>b.Debit101ccur
************************************************************************************
面試題:怎么把這樣一個表兒
year month amount
1991 1 1.1
1991 2 1.2
1991 3 1.3
1991 4 1.4
1992 1 2.1
1992 2 2.2
1992 3 2.3
1992 4 2.4
查成這樣一個結果
year m1 m2 m3 m4
1991 1.1 1.2 1.3 1.4
1992 2.1 2.2 2.3 2.4
答案一、
select year,
(select amount from aaa m where month=1 and m.year=aaa.year) as m1,
(select amount from aaa m where month=2 and m.year=aaa.year) as m2,
(select amount from aaa m where month=3 and m.year=aaa.year) as m3,
(select amount from aaa m where month=4 and m.year=aaa.year) as m4
from aaa group by year
這個是ORACLE 中做的:
select * from (select name, year b1, lead(year) over
(partition by name order by year) b2, lead(m,2) over(partition by name order by year) b3,rank()over(
partition by name order by year) rk from t) where rk=1;
************************************************************************************
精妙的SQL語句!
精妙SQL語句
作者:不詳 發文時間:2003.05.29 10:55:05
說明:復制表(只復制結構,源表名:a 新表名:b)
SQL: select * into b from a where 1<>1
說明:拷貝表(拷貝數據,源表名:a 目標表名:b)
SQL: insert into b(a, b, c) select d,e,f from b;
說明:顯示文章、提交人和最后回復時間
SQL: select a.title,a.username,b.adddate from table a,(select max(adddate) adddate from table where table.title=a.title) b
說明:外連接查詢(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
說明:日程安排提前五分鐘提醒
SQL: select * from 日程安排 where datediff('minute',f開始時間,getdate())>5
說明:兩張關聯表,刪除主表中已經在副表中沒有的信息
SQL:
delete from info where not exists ( select * from infobz where info.infid=infobz.infid )
說明:--
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
說明:--
SQL:
select * from studentinfo where not exists(select * from student where studentinfo.id=student.id) and 系名稱='"&strdepartmentname&"' and 專業名稱='"&strprofessionname&"' order by 性別,生源地,高考總成績
說明:
從數據庫中去一年的各單位電話費統計(電話費定額賀電化肥清單兩個表來源)
SQL:
SELECT a.userper, a.tel, a.standfee, TO_CHAR(a.telfeedate, 'yyyy') AS telyear,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '01', a.factration)) AS JAN,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '02', a.factration)) AS FRI,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '03', a.factration)) AS MAR,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '04', a.factration)) AS APR,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '05', a.factration)) AS MAY,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '06', a.factration)) AS JUE,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '07', a.factration)) AS JUL,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '08', a.factration)) AS AGU,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '09', a.factration)) AS SEP,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '10', a.factration)) AS OCT,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '11', a.factration)) AS NOV,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '12', a.factration)) AS DEC
FROM (SELECT a.userper, a.tel, a.standfee, b.telfeedate, b.factration
FROM TELFEESTAND a, TELFEE b
WHERE a.tel = b.telfax) a
GROUP BY a.userper, a.tel, a.standfee, TO_CHAR(a.telfeedate, 'yyyy')
說明:四表聯查問題:
SQL: select * from a left inner join b on a.a=b.b right inner join c on a.a=c.c inner join d on a.a=d.d where .....
說明:得到表中最小的未使用的ID號
SQL:
SELECT (CASE WHEN EXISTS(SELECT * FROM Handle b WHERE b.HandleID = 1) THEN MIN(HandleID) + 1 ELSE 1 END) as HandleID
FROM Handle
WHERE NOT HandleID IN (SELECT a.HandleID - 1 FROM Handle a)
*******************************************************************************
有兩個表A和B,均有key和value兩個字段,如果B的key在A中也有,就把B的value換為A中對應的value
這道題的SQL語句怎么寫?