資料庫系統原理與設計——投影運算、選擇運算
書籍：資料庫系統原理與設計(第3版)——萬常選 廖國瓊等編著
資料庫版本：SQL Server 2005
/*
select courseNO as 課程號,lower(coursename) 課程名,courseHour/16 as 周課時
from course
*/
/* --”%任意字元","_"萬用字元的使用
select *
from class
where className like '%會計%'
select studentNo,studentName
from Student
where studentName like '王__'
select studentNo,studentName
from Student
where studentName not like '%福%'
select studentNo,studentName,nation
from Student
where nation not like '蒙古族'
select studentNo,studentName,nation
from Student
where nation like '蒙古族'
*/
--萬用字元的使用
/*
select className
from class
where className like '%16\_%' ESCAPE '\'
union
select className
from class
where className like '%16\_%' --不對
union
select className
from class
where className like '%16_%' ESCAPE '\' --不對
*/
--轉義字元的使用，以下兩種方法相似
/*
select className
from class
where className like '%16#_%' escape '#'
select className
from class
where className like '%16\_%' ESCAPE '\'
*/
/* --學會邏輯運算子or and
select studentNo,courseNO,score
from score
where courseNo='001' or courseNo='005' or courseNo='003'
select studentNo,courseNO,score
from score
where courseNo='001' and courseNo='003'
select studentNo,courseNO,score
from score
where courseNo in('001','005','003')
*/
/*
select studentNO as 學號,studentName as 姓名 ,year(birthday) as 出生年份
from Student
where year(birthday)=1998 and nation='漢族'
*/
/* --籍貫不在南昌和上海的，兩種實施方法，二選一
select studentNO as 學號,studentName as 姓名 ,native
from Student
where native not in ('南昌','上海')
select studentNO as 學號,studentName as 姓名 ,native
from Student
where native!='南昌' and native!='上海'
*/
/* 80——90區間的分數
select studentNo,courseNO,score
from score
where score>=80 and score<=90
select studentNo,courseNO,score
from score
where score between 80 and 90
*/
/*
select studentNo,courseNO,score
from score
where score<80 or score>90
*/
/*
--按籍貫排序
select studentName,native,classNo
from student
where native!='南昌' and native!='上海'
order by native desc
*/
該教材相關資料請點選如下連結：
http://blog.51cto.com/sky9896/2323447
http://down.51cto.com/data/2456174
實戰技巧：完成一個任務，可以使用兩種方法來完成。