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方法一： var re=/正則表達(dá)式/; re.test($("txtid").val()) 方法二： $("txtid").val.match(/正則表達(dá)式/)； 驗(yàn)證數(shù)字的正則表達(dá)式集（轉(zhuǎn)載） 驗(yàn)證數(shù)字：^[0-9]*$ 驗(yàn)證n位的數(shù)字：^\d{n}$ 驗(yàn)證至少n位數(shù)字：^\d{n,}$ 驗(yàn)證m-n位的數(shù)字：^\d{m,n}$ 驗(yàn)證零和非零開(kāi)頭的數(shù)字：^(0|[1-9][0-9]*)$ 驗(yàn)證有兩位小數(shù)的正實(shí)數(shù)：^[0-9]+(.[0-9]{2})?$ 驗(yàn)證有1-3位小數(shù)的正實(shí)數(shù)：^[0-9]+(.[0-9]{1,3})?$ 驗(yàn)證非零的正整數(shù)：^\+?[1-9][0-9]*$ 驗(yàn)證非零的負(fù)整數(shù)：^\-[1-9][0-9]*$ 驗(yàn)證非負(fù)整數(shù)（正整數(shù) + 0） ^\d+$ 驗(yàn)證非正整數(shù)（負(fù)整數(shù) + 0） ^((-\d+)|(0+))$ 驗(yàn)證長(zhǎng)度為3的字符：^.{3}$ 驗(yàn)證由26個(gè)英文字母組成的字符串：^[A-Za-z]+$ 驗(yàn)證由26個(gè)大寫(xiě)英文字母組成的字符串：^[A-Z]+$ 驗(yàn)證由26個(gè)小寫(xiě)英文字母組成的字符串：^[a-z]+$ 驗(yàn)證由數(shù)字和26個(gè)英文字母組成的字符串：^[A-Za-z0-9]+$ 驗(yàn)證由數(shù)字、26個(gè)英文字母或者下劃線組成的字符串：^\w+$ 驗(yàn)證用戶密碼:^[a-zA-Z]\w{5,17}$ 正確格式為：以字母開(kāi)頭，長(zhǎng)度在6-18之間，只能包含字符、數(shù)字和下劃線。 驗(yàn)證是否含有 ^%&',;=?$\" 等字符：[^%&',;=?$\x22]+ 驗(yàn)證漢字：^[\u4e00-\u9fa5],{0,}$ 驗(yàn)證Email地址：^\w+[-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$ 驗(yàn)證InternetURL：^http://([\w-]+\.)+[\w-]+(/[\w-./?%&=]*)?$ ；^[a-zA-z]+://(w+(-w+)*)(.(w+(-w+)*))*(?S*)?$ 驗(yàn)證電話號(hào)碼：^(\(\d{3,4}\)|\d{3,4}-)?\d{7,8}$：--正確格式為：XXXX-XXXXXXX，XXXX-XXXXXXXX，XXX-XXXXXXX，XXX-XXXXXXXX，XXXXXXX，XXXXXXXX。 驗(yàn)證身份證號(hào)（15位或18位數(shù)字）：^\d{15}|\d{}18$ 驗(yàn)證一年的12個(gè)月：^(0?[1-9]|1[0-2])$ 正確格式為：“01”-“09”和“1”“12” 驗(yàn)證一個(gè)月的31天：^((0?[1-9])|((1|2)[0-9])|30|31)$ 正確格式為：01、09和1、31。 整數(shù)：^-?\d+$ 非負(fù)浮點(diǎn)數(shù)（正浮點(diǎn)數(shù) + 0）：^\d+(\.\d+)?$ 正浮點(diǎn)數(shù) ^(([0-9]+\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\.[0-9]+)|([0-9]*[1-9][0-9]*))$ 非正浮點(diǎn)數(shù)（負(fù)浮點(diǎn)數(shù) + 0） ^((-\d+(\.\d+)?)|(0+(\.0+)?))$ 負(fù)浮點(diǎn)數(shù) ^(-(([0-9]+\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\.[0-9]+)|([0-9]*[1-9][0-9]*)))$ 浮點(diǎn)數(shù) ^(-?\d+)(\.\d+)?
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<META NAME="Generator" CONTENT="EditPlus">
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<META NAME="Description" CONTENT="">
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  <script language=JavaScript>
  function warn(){
 var num=document.getElementById("num").value;
var pattern=/^[0-9]{1,20}$/;
if(num.match(pattern)==null || num==""){
alert("請(qǐng)輸入正整數(shù)！");
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}
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<form onsubmit="return warn()" action="Noname1.html" method="post">
<input type="text" id="num"/>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "<html xmlns="<head>
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<title>無(wú)標(biāo)題文檔</title>
</head>
<body>
<script language="javascript">
function showBaby()
{
var path=window.showModalDialog("花園baby.html","","dialogWidth:400px;dialogHeight:400px");
document.getElementById("img").innerHTML="<img src='"+path+"' width='300' height='300'>";
}
</script>
<a href="javaScript:showBaby()">我喜歡...</a>
<p id="img">
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<body>
<form id="babyFrm" name="babyFrm" method="post" action="">
<table width="471" height="405" border="1" align="center" cellpadding="0" cellspacing="0">
<tr>
<td>
<img src="imgs/[叮叮車].jpg" width="150" height="150" /><br />
<input name="gb" type="radio" value="imgs/[叮叮車].jpg" checked="checked"/>
叮叮車 </td>
<td><img src="imgs/[唔西·迪西].jpg" width="150" height="150" /><br />
<input type="radio" value="imgs/[唔西·迪西].jpg" name="gb"/>
唔西·迪西</td>
<td> </td>
</tr>
<tr>
<td><img src="imgs/[湯姆布利柏].jpg" width="150" height="150" /><br />
<input type="radio" value="imgs/[湯姆布利柏].jpg" name="gb"/>
湯姆布利柏 <br /></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td colspan="2" align="center"><input name="btnOk" type="button" id="btnOk" value="我選好了" onclick="selectOk()"/></td>
<td> </td>
</tr>
</table>
</form>
<script language="javascript">
function selectOk(){
//得到所有的單選按鈕，返回被選中的按鈕的value
var gbs=document.getElementsByName("gb");
var value;
for(var i=0;i<gbs.length;i++){
if(gbs[i].type=="radio" && gbs[i].checked){
value=gbs[i].value;
break;
}
}
window.returnValue=value;
window.close();
}
</script>
</body>
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<title>無(wú)標(biāo)題文檔</title>
<script language="javascript">
function searchFriend(){
//得到所有的復(fù)選框
var s=document.getElementById("allFriend");
var ack=document.getElementsByName("chkFriend");
for(var i=0;i<ack.length;i++){
if(ack[i].type=="checkbox"){
ack[i].checked=s.checked;
}
}
}
function rsearchFriend(){
var ack=document.getElementsByName("chkFriend");
for(var i=0;i<ack.length;i++){
if(ack[i].type=="checkbox"){
ack[i].checked=!ack[i].checked;
}
}
}
</script>
</head>
<body>
<form name="chkFriend" method="post" action="">
<p>你想交一個(gè)什么樣的朋友呢，請(qǐng)選擇：</p>
<p>
<!-- 所有的復(fù)選框名字需要調(diào)整一致 -->
<input type="checkbox" name="chkFriend" value="溫柔"> 溫柔
<input type="checkbox" name="chkFriend" value="年輕"> 年輕
<input type="checkbox" name="chkFriend" value="漂亮"> 漂亮
<input type="checkbox" name="chkFriend" value="愛(ài)洗衣服">愛(ài)洗衣服
<input type="checkbox" name="chkFriend" value="愛(ài)做飯">愛(ài)做飯
</p>
<p>
<input type="checkbox" onClick="searchFriend()" id="allFriend" name="allFriend" value="以上全選">以上全選
</p>
<input type="checkbox" onClick="rsearchFriend()" id="rallFriend" name="rallFriend" value="反選">反選
</p>
<p>
<input type="button" name="Submit" value="尋找目標(biāo)">
</p>
</form>
</body>
</html>
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<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>無(wú)標(biāo)題文檔</title>
<script language="javascript">
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document.write("<h1>"+value+"</h1>");
 }
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<body onload="show()">
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function pass(author){
window.returnValue=author;
window.close();//關(guān)掉
}
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<body>
<a href="javaScript:pass('大仲馬')">大仲馬</a><br/>
<a href="javaScript:pass('小仲馬')">小仲馬</a><br/>
</body>
</html>
</body>
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<style type="text/css">
select{
font-size:30px;
}
</style>
</head>
<body onload="bornCity('p000')">
<script language="javascript">
var pcs=new Array();
pcs[0]=new Array("p000","==請(qǐng)選擇省==","0");
pcs[1]=new Array("p001","==陜西==","0");
pcs[2]=new Array("p002","==廣東==","0");
pcs[3]=new Array("p003","==山西==","0");
pcs[4]=new Array("c001","==西安==","p001");
pcs[5]=new Array("c002","==渭南==","p001");
pcs[6]=new Array("c003","==深圳==","p002");
pcs[7]=new Array("c005","==佛山==","p002");
pcs[8]=new Array("c006","==東莞==","p002");
pcs[9]=new Array("c007","==大同==","p003");
pcs[10]=new Array("c008","==請(qǐng)選擇市==","p000");
function bornCity(value){
var city=document.getElementById("city");
//清空
city.options.length=0;
for(var i=0;i<pcs.length;i++){
if(pcs[i][2]==value){
city.options.add(new Option(pcs[i][1],pcs[i][0]));
}
}
}
</script>
<form name="pcfrm">
省:
<select name="province" onchange="bornCity(this.value);">
<script language="javascript">
for(var i=0;i<pcs.length;i++){
if(pcs[i][2]=="0")
{
document.write("<option value='"+pcs[i][0]+"'>"+pcs[i][1]+"</option>");
}
}
</script>
</select>
市:
<select name="city" id="city">
</select>
</form>
</body>
</html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>無(wú)標(biāo)題文檔</title>
</head>
<body>
<!--放置廣告層-->
<div id="adv" style="position:absolute; left:60px; top:220px; width:100px; height:75px; z-index:2">
<a href=" <img src="imgs/ad.jpg"/>
</a>
<div id="close" style="position:absolute; left:79px; top:61px; width:21px; height:14px;">
<img src="imgs/close.png" style="cursor:pointer;" onClick="closeAdv()"/>
</div>
</div>
<script language="javascript">
var x=0,y=0,ypos=220,xpos=60,step=6,speed=10;
var adv=document.getElementById("adv");
function gogogo(){
adv.style.left=xpos+document.body.scrollLeft;
adv.style.top=ypos+document.body.scrollTop;
if(x==0){
//從左到右
xpos+=step;
}else
{
xpos-=step;
}
if(xpos>=document.body.clientWidth-100){
//改變方向
xpos=document.body.clientWidth-100;
x=1;
}
if(xpos<0){
xpos=0;
x=0;
}
//縱向
if(y==0){
//從左到右
ypos+=step;
}else
{
ypos-=step;
}
if(ypos>=document.body.clientHeight-75){
//改變方向
ypos=document.body.clientHeight-75;
y=1;
}
if(ypos<0){
ypos=0;
y=0;
}
}
setInterval("gogogo()",speed);
</script>
<table width="2000" height="1000">
<tr>
<td>
<img src="imgs/bg.jpg" width="1400" height="3417"/>
</td>
</tr>
</table>
</body>
</html>
b<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>無(wú)標(biāo)題文檔</title>
</head>
<body>
<div id="yellow" style="position:absolute; left:0px; top:0px; width:200px; height:200px; background-color:#CCFF33; z-index:20">
這是一個(gè)黃層
</div>
<div id="blue" style=" overflow:hidden;position:absolute; left:100px; top:100px; width:200px; height:200px; background-color:#3399FF; z-index:1">
這是一個(gè)藍(lán)層
<div id="black" style="position:absolute; left:100px; top:100px; width:136px; height:136px; background-color:#000000;">
</div>
</div>
</body>
</html>
摘要: web.xmlCode highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--><?xml version="1.0" encoding="UTF-8"?><web-app xmlns="http://java.sun.c... 閱讀全文
Student(S#,Sname,Sage,Ssex) 學(xué)生表
Course(C#,Cname,T#) 課程表
SC(S#,C#,score) 成績(jī)表
Teacher(T#,Tname) 教師表
問(wèn)題：
1、查詢“001”課程比“002”課程成績(jī)高的所有學(xué)生的學(xué)號(hào)；
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、查詢平均成績(jī)大于60分的同學(xué)的學(xué)號(hào)和平均成績(jī)；
select S#,avg(score)
from sc
group by S# having avg(score) >60;
3、查詢所有同學(xué)的學(xué)號(hào)、姓名、選課數(shù)、總成績(jī)；
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、查詢姓“李”的老師的個(gè)數(shù)；
select count(distinct(Tname))
from Teacher
where Tname like '李%';
5、查詢沒(méi)學(xué)過(guò)“葉平”老師課的同學(xué)的學(xué)號(hào)、姓名；
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='葉平');
6、查詢學(xué)過(guò)“001”并且也學(xué)過(guò)編號(hào)“002”課程的同學(xué)的學(xué)號(hào)、姓名；
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、查詢學(xué)過(guò)“葉平”老師所教的所有課的同學(xué)的學(xué)號(hào)、姓名；
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='葉平' group by S# having count(SC.C#)=
(select count(C#) from Course,Teacher where Teacher.T#=Course.T# and Tname='葉平'));
8、查詢課程編號(hào)“002”的成績(jī)比課程編號(hào)“001”課程低的所有同學(xué)的學(xué)號(hào)、姓名；
Select S#,Sname from (select Student.S#,Student.Sname,score ,(select score from SC SC_2 where SC_2.S#=Student.S# and SC_2.C#='002') score2
from Student,SC where Student.S#=SC.S# and C#='001') S_2 where score2 <score;
9、查詢所有課程成績(jī)小于60分的同學(xué)的學(xué)號(hào)、姓名；
select S#,Sname
from Student
where S# not in (select Student.S# from Student,SC where S.S#=SC.S# and score>60);
10、查詢沒(méi)有學(xué)全所有課的同學(xué)的學(xué)號(hào)、姓名；
select Student.S#,Student.Sname
from Student,SC
where Student.S#=SC.S# group by Student.S#,Student.Sname having count(C#) <(select count(C#) from Course);
11、查詢至少有一門(mén)課與學(xué)號(hào)為“1001”的同學(xué)所學(xué)相同的同學(xué)的學(xué)號(hào)和姓名；
select S#,Sname from Student,SC where Student.S#=SC.S# and C# in select C# from SC where S#='1001';
12、查詢至少學(xué)過(guò)學(xué)號(hào)為“001”同學(xué)所有一門(mén)課的其他同學(xué)學(xué)號(hào)和姓名；
select distinct SC.S#,Sname
from Student,SC
where Student.S#=SC.S# and C# in (select C# from SC where S#='001');
13、把“SC”表中“葉平”老師教的課的成績(jī)都更改為此課程的平均成績(jī)；
update SC set score=(select avg(SC_2.score)
from SC SC_2
where SC_2.C#=SC.C# ) from Course,Teacher where Course.C#=SC.C# and Course.T#=Teacher.T# and Teacher.Tname='葉平');
14、查詢和“1002”號(hào)的同學(xué)學(xué)習(xí)的課程完全相同的其他同學(xué)學(xué)號(hào)和姓名；
select S# from SC where C# in (select C# from SC where S#='1002')
group by S# having count(*)=(select count(*) from SC where S#='1002');
15、刪除學(xué)習(xí)“葉平”老師課的SC表記錄；
Delect SC
from course ,Teacher
where Course.C#=SC.C# and Course.T#= Teacher.T# and Tname='葉平';
16、向SC表中插入一些記錄，這些記錄要求符合以下條件：沒(méi)有上過(guò)編號(hào)“003”課程的同學(xué)學(xué)號(hào)、2、
號(hào)課的平均成績(jī)；
Insert SC select S#,'002',(Select avg(score)
from SC where C#='002') from Student where S# not in (Select S# from SC where C#='002');
17、按平均成績(jī)從高到低顯示所有學(xué)生的“數(shù)據(jù)庫(kù)”、“企業(yè)管理”、“英語(yǔ)”三門(mén)的課程成績(jī)，按如下形式顯示： 學(xué)生ID,,數(shù)據(jù)庫(kù),企業(yè)管理,英語(yǔ),有效課程數(shù),有效平均分
SELECT S# as 學(xué)生ID
,(SELECT score FROM SC WHERE SC.S#=t.S# AND C#='004') AS 數(shù)據(jù)庫(kù)
,(SELECT score FROM SC WHERE SC.S#=t.S# AND C#='001') AS 企業(yè)管理
,(SELECT score FROM SC WHERE SC.S#=t.S# AND C#='006') AS 英語(yǔ)
,COUNT(*) AS 有效課程數(shù), AVG(t.score) AS 平均成績(jī)
FROM SC AS t
GROUP BY S#
ORDER BY avg(t.score)
18、查詢各科成績(jī)最高和最低的分：以如下形式顯示：課程ID，最高分，最低分
SELECT L.C# As 課程ID,L.score AS 最高分,R.score AS 最低分
FROM SC L ,SC AS R
WHERE L.C# = R.C# and
L.score = (SELECT MAX(IL.score)
FROM SC AS IL,Student AS IM
WHERE L.C# = IL.C# and IM.S#=IL.S#
GROUP BY IL.C#)
AND
R.Score = (SELECT MIN(IR.score)
FROM SC AS IR
WHERE R.C# = IR.C#
GROUP BY IR.C#
);
19、按各科平均成績(jī)從低到高和及格率的百分?jǐn)?shù)從高到低順序
SELECT t.C# AS 課程號(hào),max(course.Cname)AS 課程名,isnull(AVG(score),0) AS 平均成績(jī)
,100 * SUM(CASE WHEN isnull(score,0)>=60 THEN 1 ELSE 0 END)/COUNT(*) AS 及格百分?jǐn)?shù)
FROM SC T,Course
where t.C#=course.C#
GROUP BY t.C#
ORDER BY 100 * SUM(CASE WHEN isnull(score,0)>=60 THEN 1 ELSE 0 END)/COUNT(*) DESC
20、查詢?nèi)缦抡n程平均成績(jī)和及格率的百分?jǐn)?shù)(用"1行"顯示): 企業(yè)管理（001），馬克思（002），OO&UML （003），數(shù)據(jù)庫(kù)（004）
SELECT SUM(CASE WHEN C# ='001' THEN score ELSE 0 END)/SUM(CASE C# WHEN '001' THEN 1 ELSE 0 END) AS 企業(yè)管理平均分
,100 * SUM(CASE WHEN C# = '001' AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN C# = '001' THEN 1 ELSE 0 END) AS 企業(yè)管理及格百分?jǐn)?shù)
,SUM(CASE WHEN C# = '002' THEN score ELSE 0 END)/SUM(CASE C# WHEN '002' THEN 1 ELSE 0 END) AS 馬克思平均分
,100 * SUM(CASE WHEN C# = '002' AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN C# = '002' THEN 1 ELSE 0 END) AS 馬克思及格百分?jǐn)?shù)
,SUM(CASE WHEN C# = '003' THEN score ELSE 0 END)/SUM(CASE C# WHEN '003' THEN 1 ELSE 0 END) AS UML平均分
,100 * SUM(CASE WHEN C# = '003' AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN C# = '003' THEN 1 ELSE 0 END) AS UML及格百分?jǐn)?shù)
,SUM(CASE WHEN C# = '004' THEN score ELSE 0 END)/SUM(CASE C# WHEN '004' THEN 1 ELSE 0 END) AS 數(shù)據(jù)庫(kù)平均分
,100 * SUM(CASE WHEN C# = '004' AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN C# = '004' THEN 1 ELSE 0 END) AS 數(shù)據(jù)庫(kù)及格百分?jǐn)?shù)
FROM SC
21、查詢不同老師所教不同課程平均分從高到低顯示
SELECT max(Z.T#) AS 教師ID,MAX(Z.Tname) AS 教師姓名,C.C# AS 課程ＩＤ,MAX(C.Cname) AS 課程名稱,AVG(Score) AS 平均成績(jī)
FROM SC AS T,Course AS C ,Teacher AS Z
where T.C#=C.C# and C.T#=Z.T#
GROUP BY C.C#
ORDER BY AVG(Score) DESC
22、查詢?nèi)缦抡n程成績(jī)第 3 名到第 6 名的學(xué)生成績(jī)單：企業(yè)管理（001），馬克思（002），UML （003），數(shù)據(jù)庫(kù)（004）
[學(xué)生ID],[學(xué)生姓名],企業(yè)管理,馬克思,UML,數(shù)據(jù)庫(kù),平均成績(jī)
SELECT DISTINCT top 3
SC.S# As 學(xué)生學(xué)號(hào),
Student.Sname AS 學(xué)生姓名 ,
T1.score AS 企業(yè)管理,
T2.score AS 馬克思,
T3.score AS UML,
T4.score AS 數(shù)據(jù)庫(kù),
ISNULL(T1.score,0) + ISNULL(T2.score,0) + ISNULL(T3.score,0) + ISNULL(T4.score,0) as 總分
FROM Student,SC LEFT JOIN SC AS T1
ON SC.S# = T1.S# AND T1.C# = '001'
LEFT JOIN SC AS T2
ON SC.S# = T2.S# AND T2.C# = '002'
LEFT JOIN SC AS T3
ON SC.S# = T3.S# AND T3.C# = '003'
LEFT JOIN SC AS T4
ON SC.S# = T4.S# AND T4.C# = '004'
WHERE student.S#=SC.S# and
ISNULL(T1.score,0) + ISNULL(T2.score,0) + ISNULL(T3.score,0) + ISNULL(T4.score,0)
NOT IN
(SELECT
DISTINCT
TOP 15 WITH TIES
ISNULL(T1.score,0) + ISNULL(T2.score,0) + ISNULL(T3.score,0) + ISNULL(T4.score,0)
FROM sc
LEFT JOIN sc AS T1
ON sc.S# = T1.S# AND T1.C# = 'k1'
LEFT JOIN sc AS T2
ON sc.S# = T2.S# AND T2.C# = 'k2'
LEFT JOIN sc AS T3
ON sc.S# = T3.S# AND T3.C# = 'k3'
LEFT JOIN sc AS T4
ON sc.S# = T4.S# AND T4.C# = 'k4'
ORDER BY ISNULL(T1.score,0) + ISNULL(T2.score,0) + ISNULL(T3.score,0) + ISNULL(T4.score,0) DESC);
23、統(tǒng)計(jì)列印各科成績(jī),各分?jǐn)?shù)段人數(shù):課程ID,課程名稱,[100-85],[85-70],[70-60],[ <60]
SELECT SC.C# as 課程ID, Cname as 課程名稱
,SUM(CASE WHEN score BETWEEN 85 AND 100 THEN 1 ELSE 0 END) AS [100 - 85]
,SUM(CASE WHEN score BETWEEN 70 AND 85 THEN 1 ELSE 0 END) AS [85 - 70]
,SUM(CASE WHEN score BETWEEN 60 AND 70 THEN 1 ELSE 0 END) AS [70 - 60]
,SUM(CASE WHEN score < 60 THEN 1 ELSE 0 END) AS [60 -]
FROM SC,Course
where SC.C#=Course.C#
GROUP BY SC.C#,Cname;
24、查詢學(xué)生平均成績(jī)及其名次
SELECT 1+(SELECT COUNT( distinct 平均成績(jī))
FROM (SELECT S#,AVG(score) AS 平均成績(jī)
FROM SC
GROUP BY S#
) AS T1
WHERE 平均成績(jī) > T2.平均成績(jī)) as 名次,
S# as 學(xué)生學(xué)號(hào),平均成績(jī)
FROM (SELECT S#,AVG(score) 平均成績(jī)
FROM SC
GROUP BY S#
) AS T2
ORDER BY 平均成績(jī) desc;
25、查詢各科成績(jī)前三名的記錄:(不考慮成績(jī)并列情況)
SELECT t1.S# as 學(xué)生ID,t1.C# as 課程ID,Score as 分?jǐn)?shù)
FROM SC t1
WHERE score IN (SELECT TOP 3 score
FROM SC
WHERE t1.C#= C#
ORDER BY score DESC
)
ORDER BY t1.C#;
26、查詢每門(mén)課程被選修的學(xué)生數(shù)
select c#,count(S#) from sc group by C#;
27、查詢出只選修了一門(mén)課程的全部學(xué)生的學(xué)號(hào)和姓名
select SC.S#,Student.Sname,count(C#) AS 選課數(shù)
from SC ,Student
where SC.S#=Student.S# group by SC.S# ,Student.Sname having count(C#)=1;
28、查詢男生、女生人數(shù)
Select count(Ssex) as 男生人數(shù) from Student group by Ssex having Ssex='男';
Select count(Ssex) as 女生人數(shù) from Student group by Ssex having Ssex='女'；
29、查詢姓“張”的學(xué)生名單
SELECT Sname FROM Student WHERE Sname like '張%';
30、查詢同名同性學(xué)生名單，并統(tǒng)計(jì)同名人數(shù)
select Sname,count(*) from Student group by Sname having count(*)>1;;
31、1981年出生的學(xué)生名單(注：Student表中Sage列的類型是datetime)
select Sname, CONVERT(char (11),DATEPART(year,Sage)) as age
from student
where CONVERT(char(11),DATEPART(year,Sage))='1981';
32、查詢每門(mén)課程的平均成績(jī)，結(jié)果按平均成績(jī)升序排列，平均成績(jī)相同時(shí)，按課程號(hào)降序排列
Select C#,Avg(score) from SC group by C# order by Avg(score),C# DESC ;
33、查詢平均成績(jī)大于85的所有學(xué)生的學(xué)號(hào)、姓名和平均成績(jī)
select Sname,SC.S# ,avg(score)
from Student,SC
where Student.S#=SC.S# group by SC.S#,Sname having avg(score)>85;
34、查詢課程名稱為“數(shù)據(jù)庫(kù)”，且分?jǐn)?shù)低于60的學(xué)生姓名和分?jǐn)?shù)
Select Sname,isnull(score,0)
from Student,SC,Course
where SC.S#=Student.S# and SC.C#=Course.C# and Course.Cname='數(shù)據(jù)庫(kù)'and score <60;
35、查詢所有學(xué)生的選課情況；
SELECT SC.S#,SC.C#,Sname,Cname
FROM SC,Student,Course
where SC.S#=Student.S# and SC.C#=Course.C# ;
36、查詢?nèi)魏我婚T(mén)課程成績(jī)?cè)?0分以上的姓名、課程名稱和分?jǐn)?shù)；
SELECT distinct student.S#,student.Sname,SC.C#,SC.score
FROM student,Sc
WHERE SC.score>=70 AND SC.S#=student.S#;
37、查詢不及格的課程，并按課程號(hào)從大到小排列
select c# from sc where scor e <60 order by C# ;
38、查詢課程編號(hào)為003且課程成績(jī)?cè)?0分以上的學(xué)生的學(xué)號(hào)和姓名；
select SC.S#,Student.Sname from SC,Student where SC.S#=Student.S# and Score>80 and C#='003';
39、求選了課程的學(xué)生人數(shù)
select count(*) from sc;
40、查詢選修“葉平”老師所授課程的學(xué)生中，成績(jī)最高的學(xué)生姓名及其成績(jī)
select Student.Sname,score
from Student,SC,Course C,Teacher
where Student.S#=SC.S# and SC.C#=C.C# and C.T#=Teacher.T# and Teacher.Tname='葉平' and SC.score=(select max(score)from SC where C#=C.C# );
41、查詢各個(gè)課程及相應(yīng)的選修人數(shù)
select count(*) from sc group by C#;
42、查詢不同課程成績(jī)相同的學(xué)生的學(xué)號(hào)、課程號(hào)、學(xué)生成績(jī)
select distinct A.S#,B.score from SC A ,SC B where A.Score=B.Score and A.C# <>B.C# ;
43、查詢每門(mén)功成績(jī)最好的前兩名
SELECT t1.S# as 學(xué)生ID,t1.C# as 課程ID,Score as 分?jǐn)?shù)
FROM SC t1
WHERE score IN (SELECT TOP 2 score
FROM SC
WHERE t1.C#= C#
ORDER BY score DESC
)
ORDER BY t1.C#;
44、統(tǒng)計(jì)每門(mén)課程的學(xué)生選修人數(shù)（超過(guò)10人的課程才統(tǒng)計(jì)）。要求輸出課程號(hào)和選修人數(shù)，查詢結(jié)果按人數(shù)降序排列，查詢結(jié)果按人數(shù)降序排列，若人數(shù)相同，按課程號(hào)升序排列
select C# as 課程號(hào),count(*) as 人數(shù)
from sc
group by C#
order by count(*) desc,c#
45、檢索至少選修兩門(mén)課程的學(xué)生學(xué)號(hào)
select S#
from sc
group by s#
having count(*) > = 2
46、查詢?nèi)繉W(xué)生都選修的課程的課程號(hào)和課程名
select C#,Cname
from Course
where C# in (select c# from sc group by c#)
47、查詢沒(méi)學(xué)過(guò)“葉平”老師講授的任一門(mén)課程的學(xué)生姓名
select Sname from Student where S# not in (select S# from Course,Teacher,SC where Course.T#=Teacher.T# and SC.C#=course.C# and Tname='葉平');
48、查詢兩門(mén)以上不及格課程的同學(xué)的學(xué)號(hào)及其平均成績(jī)
select S#,avg(isnull(score,0)) from SC where S# in (select S# from SC where score <60 group by S# having count(*)>2)group by S#;
49、檢索“004”課程分?jǐn)?shù)小于60，按分?jǐn)?shù)降序排列的同學(xué)學(xué)號(hào)
select S# from SC where C#='004'and score <60 order by score desc;
50、刪除“002”同學(xué)的“001”課程的成績(jī)
delete from Sc where S#='001'and C#='001'
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