數(shù)據(jù)庫原理與應(yīng)用實(shí)驗(yàn)2-3

1、實(shí)驗(yàn)2.3視圖的定義和操作一、實(shí)驗(yàn)?zāi)康模豪斫庖晥D的概念，掌握視圖的使用方法。二、實(shí)驗(yàn)過程1. 對(duì)應(yīng)HRM數(shù)據(jù)庫，參照前面實(shí)驗(yàn)中完成的查詢，按如下要求自行設(shè)計(jì)視圖：1基于單個(gè)表按投影操作定義視圖。舉例：定義一個(gè)視圖用以查看所有職工的編號(hào)、和出生日期。CREATE VIEW Departme nts_ViewASSELECT*FROMDepartme nts> - /穢眄 HRM| SELECT * FROM DepartmentsViewjIfiO %+匡TTQL /"/脯結(jié)黑廠聲龍IliepaxtinviitlDD«P«r ini frutN an aKot

2、a11;略努部財(cái)勞部1z£硏樂部研単部32人力資源部人力賁源部|sex=' true '的職工的所有信息的2基于單個(gè)表按選擇操作定義視圖。舉例：定義一個(gè)滿足 視圖。CREATE VIEW Employee_viewAS SELECT *星® Bi HlRM100%FROM Employee WHERE Sex = 'TRUE'SELECT * FROM Employee view3 -£QL / N /劉茫果I'窗消總2OJ3NoneS*4X4=E.Pkc nolens «r王甜w1MO L1 02 03.00.C

3、O. ocoW91-D3-15 00:0110 0001?76-06-12 00:00 00 UCO475C02475CO?O3T63L03355036356咐II創(chuàng)空J(rèn)LU.吧dlL DJjznCiheiiij cr3基于單個(gè)表按選擇和投影操作定義視圖。舉例：定義一個(gè)視圖用以查看部門號(hào)碼為2'的所有職工的、和郵件地址。CREATE VIEW Employee_view1AS SELECT Name, Pho neNumber, EmailAddressFROM EmployeeWHERE Departme ntID = '2'4 J蠱| 亞祜咄HRM| SELECT*

4、 FROM Employee_view1UM %&TSQL /村 一哥結(jié)果的"箱慝FhonelTuinber1弓僉坤閃品tlSkentL ®cml230370344lyktnu. «4ub ctl0378355imtSkenii. edu_ cn4基于多個(gè)表根據(jù)連接操作定義視圖。舉例：定義一個(gè)視圖用以查看所有職工的、部門名及工資。CREATE VIEW Employee_Departme nts_Salary_View(Name, Departme nt. Salary)FROM Employee a, Departme nts b, Salary cWH

5、ERE a.EmployeeID = c.EmployeeID AND a.Departme ntID = b.Departme ntID;o y欝利呼創(chuàng)HR斷T館甜嚴(yán)| SELECT * FROM Employee_Departments_Salary_Vi&wuoo %空SQL /Tl / 睜結(jié)果J 育題笙 y12李勇|財(cái)務(wù)部2100?3003財(cái)勞部茂00強(qiáng)立400硏發(fā)部ZOOO張孜研發(fā)部£300人力資源部KOO趙軍人力資源部Z3005基于多個(gè)表根據(jù)嵌套查詢定義視圖。舉例：定義一個(gè)比所有財(cái)務(wù)部的雇職工資都高的雇員的信息的視圖CREATE VIEW Employee_Sal

6、ary_ViewAS SELECT *FROM EmployeeWHERE EmployeelD IN(SELECT EmployeeID FROM Salary WHERE I ncome > ALL(SELECT In come FROM Salary WHERE EmployeeID IN(SELECT EmployeeID FROM Employee WHERE Departme ntID =(SELECT Departme ntID FROM Departme nts WHERE Departme ntName =N'財(cái)務(wù)部4丿羽軸呼轄HRM埒- r可| SLLtCf

7、T FRUM Employee Salary View6定義含有虛字段即根本表中原本不存在的字段的視圖。 看所有雇員的編號(hào)、年齡CREATE VIEW E_View(EmployeelD, Name, Age)ioc %-ST-5QL /儀5Eftpl出餐冬遼SameAldressZipThcKnFunlerEnh.il Addressi! 2001 :1吐彳1978-09-01 00:00：M MOII4?EtD4J376333ilkena ed.1. cn12200210B2h01-23 CO:0O:OC. MO047ED36376344lyiOitruj. edn. cel3198C-0

8、3-15 00;(»K). QOQ14 再 OTfiTifrWhffl'i 聞?dòng)?cn4珈1:1S7&-O9 12 CO: QQ:00, CMO:河審47TOT070MGJ. J<J«. Ufil3530021979-0&-19 00:00:00 OflCiu4 踐 UJ«03f63r?zj ilkna. edu. ci11舉例：定義一個(gè)視圖用以查AS SELECT EmployeeID, Name, DATEDIFF(YEAR, Birthday, GETDATE()卜同咄哂襯HRM| SELECT * FROM E_View100

9、 % *S TSQL /tL" mploy9«n)Agf12341001導(dǎo)勇3S1002王融3£1003劉崇332M1弛立3S5百2002文嚴(yán)3420033573001403002趙軍37FROM Employee2. 分別在定義的視圖上進(jìn)行查詢、插入、更新和刪除操作，分情況查詢、更新討論哪 些操作可以成功完成，哪些不能成功完成，并分析原因。查詢：> - /穢町 HRM| SELECT * FROM DepartmentsViewjIfiO %+5 T-SQL TX /脯結(jié)黑廠回;龍 1 -IlepaxtinviitlDD«P«r ini

10、 stutN am aKota11L ! ! a fa I 1 uillbl llll 4Hllid III ill 111 朋努部網(wǎng)畀部 Iz硏朵部研發(fā)部32人力資源部人力賁源部|插入:insert into Departments_View values'4',N' 銷售部',N'銷售部'| SELECT 羽 FROM Departments View100 %TST SQL /m欝腐息IDepartvneiitZD片 epar tmeatHam e】I財(cái)舸1財(cái)爵部22硏發(fā)卻冊(cè)岌部a3人力蛍源部人力資源部44I請(qǐng)售部)更新:update Departments_View set Note=N'無'| SELECT* FROM DepartmentViewIOC %號(hào)J-gL.翻備G 鬲消息|Deprtimw tIDNote11財(cái)勢部無J2廠1i研岌部一無33無二4濡售部無刪除：delete from Departme nts