SqlÓï¾äʹÓà 50¸öʾÀý
Student(S#,Sname,Sage,Ssex) ѧÉú±í
Course(C#,Cname,T#) ¿Î³Ì±í
SC(S#,C#,score) ³É¼¨±í
Teacher(T#,Tname) ½Ìʦ±í
ÎÊÌ⣺
1¡¢²éѯ“001”¿Î³Ì±È“002”¿Î³Ì³É¼¨¸ßµÄËùÓÐѧÉúµÄѧºÅ£»
select a.S# from (select s#,score from SC where C#='001') a,(select s#,score
from SC where C#='002') b
where a.score>b.score and a.s#=b.s#;
2¡¢²éѯƽ¾ù³É¼¨´óÓÚ60·ÖµÄͬѧµÄѧºÅºÍƽ¾ù³É¼¨£»
select S#,avg(score)
from sc
group by S# having avg(score) >60;
3¡¢²éѯËùÓÐͬѧµÄѧºÅ¡¢ÐÕÃû¡¢Ñ¡¿ÎÊý¡¢×ܳɼ¨£»
select Student.S#,Student.Sname,count(SC.C#),sum(score)
from Student left Outer join SC on Student.S#=SC.S#
group by Student.S#,Sname
4¡¢²éѯÐÕ“ÀÄÀÏʦµÄ¸öÊý£»
select count(distinct(Tname))
from Teacher
where Tname like 'Àî%';
5¡¢²éѯûѧ¹ý“Ҷƽ”ÀÏʦ¿ÎµÄͬѧµÄѧºÅ¡¢ÐÕÃû£»
select Student.S#,Student.Sname
from Student
where S# not in (select distinct( SC.S#) from SC,Course,Teacher where SC.C#=Course.C# and Teacher.T#=Course.T# and Teacher.Tname='Ҷƽ');
6¡¢²éѯѧ¹ý“001”²¢ÇÒҲѧ¹ý±àºÅ“002”¿Î³ÌµÄͬѧµÄѧºÅ¡¢ÐÕÃû£»
select Student.S#,Student.Sname from Student,SC where Student.S#=SC.S# and SC.C#='001'and exists( Select * from SC as SC_2 where SC_2.S#=SC.S# and SC_2.C#='002');
7¡¢²éѯѧ¹ý“Ҷƽ”ÀÏʦËù½ÌµÄËùÓпεÄͬѧµÄѧºÅ¡¢ÐÕÃû£»
select S#,Sname
from Student
where S# in (select S# from SC ,Course ,Teacher where SC.C#=Course.C# and Teacher.T#=Course.T# and Teacher.Tname='Ҷƽ' group by S# having count(SC.C#)=(select count(C#) from Course,Teacher where Teacher.T#=Course.T# and Tname='Ҷƽ'));
8¡¢²éѯ¿Î³Ì±àºÅ“002”µÄ³É¼¨±È¿Î³Ì±àºÅ“001”¿Î³ÌµÍµÄËùÓÐͬѧµÄѧºÅ¡¢ÐÕÃû£»
Select S#,Sname from (select Student.S#,Student.Sname,score ,(select score from SC
Ïà¹ØÎĵµ£º
¸ù據ǰһƪ關ì¶×Ô動備·ÝµÄÎÄÕ£¬對應µÄ×Ô動還Ô·½°¸
create procedure [dbo].[sp_RestoreDatabase]
@SourceDirBackupFiles NVARCHAR(200)
as
declare @DatabaseName sysname
--Table to hold the result from RESTORE HEADERONLY. Needed to get the database name o ......
import java.sql.*;
public class JdbcUtil
{
public static void close(Statement st, Connection con)
{
try
{
&nb ......
mysql : ½«Ò»¸ö±íµÄÊý¾Ý²åÈëµ½newT ÖÐ
£¨newT ±íÐë´æÔÚ£¬ÇҽṹÓëselect Óï¾ä¶ÔÓ¦µÄ½á¹¹Í¬ £¬×îºÃ²»ÓÃ* ¶øÊǾßÌå×ֶΣ©
insert into newT select * from t1 where ...
Ò²¿ÉÒÔcreate table newT select f1,f2 from t1; (select into µÄÌæ´ú·½·¨£¬my ......
/***************************************************
×÷Õߣºherowang(ÈÃÄãÍû¼ûÓ°×ÓµÄǽ£©
ÈÕÆÚ£º2010.1.1
×¢£º ×ªÔØÇë±£Áô´ËÐÅÏ¢
& ......
Èç¹ûÄãÕýÔÚ¸ºÔðÒ»¸ö»ùÓÚSQL ServerµÄÏîÄ¿£¬»òÕßÄã¸Õ¸Õ½Ó´¥SQL Server£¬Äã¶¼ÓпÉÄÜÒªÃæÁÙһЩÊý¾Ý¿âÐÔÄܵÄÎÊÌ⣬ÕâÆªÎÄÕ»áΪÄãÌṩһЩÓÐÓõÄÖ¸µ¼£¨ÆäÖдó¶àÊýÒ²¿ÉÒÔÓÃÓÚÆäËüµÄDBMS£©¡£
ÔÚÕâÀÎÒ²»´òËã½éÉÜʹÓÃSQL ServerµÄÇÏÃÅ£¬Ò²²»ÄÜÌṩһ¸ö°üÖΰٲ¡µÄ·½°¸£¬ÎÒËù×öµÄÊÇ×ܽáһЩ¾Ñé----¹ØÓÚÈçºÎÐγÉÒ»¸öºÃµÄÉè¼Æ¡£Õ ......