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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⣺
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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;
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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
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select count(distinct(Tname))
from Teacher
where Tname like 'Àî%';
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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');
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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');
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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.Snam
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table±í
×Ö¶Î1 ×Ö¶ ......
SQL ÖеĴ洢¹ý³Ì£º
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if exists(select * from sysobject where name='proc name' and type='p')
drop proc proc name
go
2.¶¨Òå´æ´¢¹ý³Ì
create proc test
@gradel int, --¶¨Òå±äÁ ......
@SuppressWarnings("unchecked")
public List<ZxFunction> selectFunctionParentByUserId(final int userId) {
try {
final String sql = "select * from zx_function ......
--kshϵÄÒ»¸öWHILE Ñ»·µÄÀý×Ó
integer i=1
while ((i<67))
do
pirnt $i
i=i+1
done
--ksh ÏÂÒ»¸öFORÑ»·µÄÀý×Ó
for i in `cat listdate.txt`
do
echo "Ö´ÐÐ $i "
done
--- date.pl ÓÃÓÚÉú³ÉÒ»¸öʱ¼ä¶ÎÎļþ
#!/usr/local/bin/perl
use DBI;
if($#ARGV<1)
{
&nbs ......