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數(shù)據(jù)庫系統(tǒng)實驗課實驗報告-文庫吧

2024-08-03 00:00 本頁面


【正文】 tudent表ID 的外鍵約束 ,觀察并解釋實驗結果。(6) 設置takes表ID, course_id,sec_id三個字段非空,是否能設置成功,對插入數(shù)據(jù)有沒有影響? 刪除takes表主鍵約束,增加某同學選同一門課程(id, couese_id, sec_id, semester, year, grade都相同)的信息,能否插入成功?解釋原因。4. 參照表student建立一張空表student1。要求用兩種方法實現(xiàn) (create table。 create table as …)。5. 增加section表上的約束條件,要求所輸入section的年號不大于當前年號+1,且不小于當前年號2。插入一條2009年秋CS101 開設課的信息,觀察并解釋實驗結果。6. 選擇某個約束,分別設置其有效、失效,觀察區(qū)別。出現(xiàn)問題沒有問題解決方案(列出遇到的問題及其解決方法)《數(shù)據(jù)庫系統(tǒng)》實驗報告三學號姓名實驗時間實驗名稱數(shù)據(jù)查詢實驗學時4準備材料1. SQL Plus命令手冊2. Oracle數(shù)據(jù)字典擴展實驗1. 利用企業(yè)管理器的圖形界面構造查詢語句,并察看查詢結果2. 利用企業(yè)管理器完成視圖、索引的創(chuàng)建與使用。3. 利用DBMS進行對第三章習題所設計SQL語句的檢查 (此部分內容不要求在實驗室完成,不用寫入實驗報告。)實驗環(huán)境Oracle 9i(及以上版本)服務器SQL Plus/ SQL Plus work sheet客戶端實驗目的1.掌握使用SQL語句進行數(shù)據(jù)查詢的方法2. 掌握視圖的創(chuàng)建與使用方法3. 觀察索引的使用效果實驗內容及步驟1. 執(zhí)行文件ddl+,創(chuàng)建數(shù)據(jù)庫University中所有表。執(zhí)行文件 ,插入實驗數(shù)據(jù)。2. 使用University數(shù)據(jù)庫的數(shù)據(jù)庫結構和數(shù)據(jù)(smallRelations即可),完成下列查詢:(1) Find the names of courses in Computer science department which have 3 credits(2) For the student with ID 12345 (or any other value), show all course_id and title of all courses registered for by the student. (3) As above, but show the total number of credits for such courses (taken by that student). Don39。t display the tot_creds value from the student table, you should use SQL aggregation on courses taken by the student. (4) As above, but display the total credits for each of the students, along with the ID of the student。 don39。t bother about the name of the student. (Don39。t bother about students who have not registered for any course, they can be omitted) (5) Find the names of all students who have taken any Comp. Sci. course ever (there should be no duplicate names) (6) Display the IDs of all instructors who have never taught a couse (Notes 1) Oracle uses the keyword minus in place of except。 2) interpret taught as taught or is scheduled to teach) (7) As above, but display the names o
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