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50¸ö³£ÓÃsqlÓï¾ä
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#,Stud
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ÔÚÈκÎÔÊÐí³öÏÖµÄλÖÃÉÏ¡£SQL°üº¬ÁËÆßÖÖº¯Êý:
(1)¾ÛºÏº¯Êý:·µ»Ø»ã×ÜÖµ¡£
(2)תÐͺ¯Êý:½«Ò»ÖÖÊý¾ÝÀàÐÍת»»ÎªÁíÍâÒ»ÖÖ¡£
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(5)×Ö·û´®º¯Êý:¶Ô×Ö·û´ ......
use Dbname
go
select
[±íÃû]=c.Name,
[±í˵Ã÷]=isnull(f.[value],''),
[ÁÐÃû]=a.Name,
[ÁÐÐò號]=a.Column_id,
&nbs ......
@echo off
rem Input Parameters:
rem 1 -Server Name
rem 2 -Database Name
if "%1"=="" goto ERROR
if "%2"=="" goto ERROR
@rem Make variables local
@Setlocal
@rem set variables from input parameters
set Server=% 1
set DBName=% 2
@rem------------------------------------------------------------ ......
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1. Ôʼµ¥¾ÝÓëʵÌåÖ®¼äµÄ¹ØÏµ
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C = CHECK Ô¼Êø
D = ĬÈÏÖµ»ò DEFAULT Ô¼Êø
F = FOREIGN KEY Ô¼Êø
FN = ±êÁ¿º¯Êý
IF = ÄÚǶ±íº¯Êý
K = PRIMARY KEY »ò UNIQUE Ô¼Êø
L = ÈÕÖ¾
P = ´æ´¢¹ý³Ì
R = ¹æÔò
RF = ¸´ÖÆÉ¸Ñ¡´æ´¢¹ý³Ì
S = ϵͳ±í
TF = ±íº¯Êý
TR = ´¥·¢Æ÷
U = Óû§±í
V = ÊÓͼ
X = À©Õ¹´æ´¢¹ý³Ì
......