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1三級模式間存在兩種映射,它們是(A)。A模式與子模式間,模式與內(nèi)模式間2SQLSERVER系統(tǒng)中的所有系統(tǒng)級信息存儲于哪個數(shù)據(jù)庫(A)。AMASTER3下面關(guān)于TEMPDB數(shù)據(jù)庫描述不正確的是(D)。D是用戶建立新數(shù)據(jù)庫的模板4在數(shù)據(jù)庫技術(shù)中,面向?qū)ο髷?shù)據(jù)模型是一種(B)。B結(jié)構(gòu)模型5數(shù)據(jù)庫管理系統(tǒng)常見的數(shù)據(jù)模型有(B)。B層次、關(guān)系和網(wǎng)狀6用戶看到的數(shù)據(jù)表,屬于數(shù)據(jù)庫系統(tǒng)三級模式中的(D模式7對數(shù)據(jù)的插入屬于數(shù)據(jù)庫管理系統(tǒng)(B)的功能。B數(shù)據(jù)操縱8保持?jǐn)?shù)據(jù)的完整性屬于數(shù)據(jù)庫管理系統(tǒng)(C)的功能。C數(shù)據(jù)庫的運行管理9在SQLSERVER數(shù)據(jù)庫中,默認(rèn)情況下SYS通常是(C)。C系統(tǒng)表表名的前綴1設(shè)一個關(guān)系為R,如果它的每個屬性都是不可再分的,則稱這個關(guān)系是符合(A)。A第一范式2在第一個關(guān)系中出現(xiàn),在第二個關(guān)系中不出現(xiàn)的記錄組成的關(guān)系稱為兩個關(guān)系的(C)。C差3關(guān)系數(shù)據(jù)庫規(guī)范化是為了解決關(guān)系數(shù)據(jù)庫中的(A)問題。A插入、刪除和數(shù)據(jù)冗余B提高查詢的速度4關(guān)系模式中,滿足2NF的模式,(B)。B必定是1NF1下述關(guān)于索引的描述,正確的是(B)建立索引后,會影響基本表的插入速度2下述關(guān)于視圖的描述,正確的是C在SQLSERVER中,可以像基本表一樣對視圖進(jìn)行查詢操作3如果希望從學(xué)生表中查詢出所有姓“張”的同學(xué),那么條件語句應(yīng)該是(B)。BWHERE姓名LIKE張4下列SQL語句中,能夠完成求某列最大值的是(B)。BSELECTMAXAGEFROMSTUDENT5假定學(xué)生關(guān)系S(SNO,SNAME,SEX,AGE),課程關(guān)系C(CNO,CNAME,TEACHER),學(xué)生選課關(guān)系SC(SNO,CNO,GRADE)。要查詢選修了“計算機技術(shù)”課程的“女”學(xué)生姓名,將涉及到關(guān)系(D)。DS,C,SC1如果希望從學(xué)生表中查詢出所有姓“李”的同學(xué),那么條件語句應(yīng)該是(B)。B、WHERE姓名LIKE李2在一個教師關(guān)系中,能夠成為主關(guān)鍵字(或稱主碼)的屬性是(B)。B、教師編號3從最終用戶應(yīng)用程序的視角看,數(shù)據(jù)庫系統(tǒng)的三級模式結(jié)構(gòu)是(C)。C、外模式、模式和內(nèi)模式4在一個學(xué)生關(guān)系中,能夠成為主關(guān)鍵字(或稱主碼)的屬性是(C)。C、學(xué)號5有嚴(yán)格的數(shù)學(xué)基礎(chǔ)的數(shù)據(jù)模型是(A)。A、關(guān)系模型6下列關(guān)于索引的說明不正確的是(A)。A、索引必須創(chuàng)建在主關(guān)鍵字之上7設(shè)關(guān)系R是滿足第一范式的,若R中不存在非主屬性對主鍵的部分函數(shù)依賴,則R符合(A)。A、第二范式8下列符合第三范式的關(guān)系是(D)。D、學(xué)生(學(xué)號,姓名,性別)9在第一個關(guān)系中出現(xiàn),而在第二個關(guān)系中不出現(xiàn)的記錄組成的新關(guān)系稱為(D)。D、兩個關(guān)系的差10數(shù)據(jù)庫應(yīng)用程序開發(fā)中,需求分析階段的主要目的是(A)。A、回答“干什么”的問題11用戶使用SQLSERVER時,通常需要依次經(jīng)過兩個安全性階段(C)。C、身份驗證、權(quán)限認(rèn)證12SQLSERVER數(shù)據(jù)庫中的一個完整的備份通常要包括(A)。A、系統(tǒng)數(shù)據(jù)庫、用戶數(shù)據(jù)庫和事務(wù)日志13下列哪些不屬于索引的類型(D)。D、事務(wù)日志索引14下列SQL語句中,能夠完成并運算的是(A)。A、SELECTFROM籃球愛好者UNIONSELECTFROM足球愛好者15設(shè)學(xué)生表和課程表的結(jié)構(gòu)分別為(學(xué)號,姓名)和(學(xué)號,課程號,成績),如果希望查詢出“成績大于90分的學(xué)生姓名”,則對應(yīng)的SQL語句是(D)。D、SELECT姓名FROM學(xué)生表,課程表WHERE學(xué)生表學(xué)號課程表學(xué)號AND課程表成績901如果希望從學(xué)生表中查詢出所有姓“王”的同學(xué),那么條件語句應(yīng)該是(B)。B、WHERE姓名LIKE王2通常情況下,“數(shù)據(jù)庫管理系統(tǒng)”的英文縮寫是(A)。A、DBMS3從最終用戶應(yīng)用程序的視角看,數(shù)據(jù)庫系統(tǒng)的三級模式結(jié)構(gòu)是(C)。C、外模式、模式和內(nèi)模式4在一個學(xué)生關(guān)系中,能夠成為主關(guān)鍵字(或稱主碼)的屬性是(C)。C、學(xué)號5有嚴(yán)格的數(shù)學(xué)基礎(chǔ)的數(shù)據(jù)模型是(A)。A、關(guān)系模型6下列關(guān)于索引的說明不正確的是(A)。A、索引必須創(chuàng)建在主關(guān)鍵字之上7設(shè)關(guān)系R是滿足第一范式的,若R中不存在非主屬性對主鍵的部分函數(shù)依賴,則R符合(A)。A、第二范式8下列符合第三范式的關(guān)系是(D)。D、學(xué)生(學(xué)號,姓名,性別)9在第一個關(guān)系中出現(xiàn),而在第二個關(guān)系中不出現(xiàn)的記錄組成的新關(guān)系稱為(D)。D、兩個關(guān)系的差10數(shù)據(jù)庫應(yīng)用程序開發(fā)中,需求分析階段的主要目的是(A)。A、回答“干什么”的問題11用戶使用SQLSERVER時,通常需要依次經(jīng)過兩個安全性階段(C)。C、身份驗證、權(quán)限認(rèn)證12SQLSERVER數(shù)據(jù)庫中的一個完整的備份通常要包括(A)。A、系統(tǒng)數(shù)據(jù)庫、用戶數(shù)據(jù)庫和事務(wù)日志13SQLSERVER中進(jìn)行數(shù)據(jù)庫恢復(fù)的SQL語句是(C)。C、RESTOREDATABASE14下列SQL語句中,能夠完成并運算的是(A)。A、SELECTFROM籃球愛好者UNIONSELECTFROM足球愛好者15設(shè)學(xué)生表和課程表的結(jié)構(gòu)分別為(學(xué)號,姓名)和(學(xué)號,課程號,成績),如果希望查詢出“成績大于90分的學(xué)生姓名”,則對應(yīng)的SQL語句是(D)。D、SELECT姓名FROM學(xué)生表,課程表WHERE學(xué)生表學(xué)號課程表學(xué)號AND課程表成績901下列()是指數(shù)據(jù)庫管理系統(tǒng)。D、DBMS2有嚴(yán)格的數(shù)學(xué)基礎(chǔ)并在此基礎(chǔ)上發(fā)展起來的數(shù)據(jù)庫模型是()。C、關(guān)系模型3在銷售商品關(guān)系中,能夠成為主關(guān)鍵字(或稱主碼)的屬性是()。B、商品編號4SQLSERVER系統(tǒng)中的所有系統(tǒng)級信息存儲于()數(shù)據(jù)庫中。AMASTER5關(guān)系數(shù)據(jù)庫規(guī)范化理論是為解決關(guān)系數(shù)據(jù)庫中()問題而引入的。A、插入、刪除和數(shù)據(jù)冗余6下列符合第三范式的關(guān)系是()。B、零件(零件編號,零件名稱,零件重量,零件儲存的倉庫編號)7如果希望從學(xué)生表中查詢出最大年齡的同學(xué),那么語句中應(yīng)該包含()。B、SELECTMAX年齡AS最大FROM學(xué)生表8下列關(guān)于索引的說明不正確的是()。B、索引一經(jīng)建立就需要人工進(jìn)行維護9在第一個關(guān)系中出現(xiàn),在第二個關(guān)系中不出現(xiàn)的記錄組成的新關(guān)系稱為()。D、兩個關(guān)系的差10SQLSERVER默認(rèn)的登錄賬號為()。A、SA11數(shù)據(jù)庫應(yīng)用程序開發(fā)中,()屬于物理設(shè)計。B、存儲方法設(shè)計12下列SQL語句中,能夠完成刪除功能的是()。D、DELETEFROM教師表WHERE性別男13查詢姓名中帶有“芳”字的學(xué)生,則條件語句應(yīng)包含()。B、WHERE姓名LIKE芳14下列SQL語句中,限制字段取值范圍的約束是()。C、性別CHAR2NOTNULLCHECK性別男OR性別女15設(shè)學(xué)生表和成績表的結(jié)構(gòu)分別為(學(xué)號,姓名,所在系)和(學(xué)號,課程名,成績),如果希望按分?jǐn)?shù)降序查詢出“英語系中選修了計算機課程的學(xué)生姓名和成績”,則對應(yīng)的SQL語句是()。D、SELECT姓名,成績FROM學(xué)生表,成績表WHERE所在系英語系A(chǔ)ND課程名計算機AND學(xué)生表學(xué)號課程表學(xué)號ORDERBY成績DESC1關(guān)系數(shù)據(jù)庫系統(tǒng)采用關(guān)系模型作為數(shù)據(jù)的組織方式。關(guān)系模型通常由三部分組成()。A數(shù)據(jù)結(jié)構(gòu)、關(guān)系操作集合和關(guān)系的完整性2以下不屬于SQLSERVER數(shù)據(jù)庫特點的是()。C基于面向?qū)ο蟮臄?shù)據(jù)模型3SQLSERVER數(shù)據(jù)庫一般包括兩大類數(shù)據(jù)庫類型()。D系統(tǒng)數(shù)據(jù)庫和用戶數(shù)據(jù)庫4在一個物資臺賬數(shù)據(jù)表中,能夠成為主關(guān)鍵字(或稱主碼)的字段是()。B物資編碼5在物理層面,SQLSERVER數(shù)據(jù)庫是由數(shù)據(jù)文件和事務(wù)日志文件兩個操作系統(tǒng)文件組成的,它們的后綴分別是()。AMDF和LDF6SQLSERVER數(shù)據(jù)庫中的系統(tǒng)表的表名通常以()為前綴。BSYS7設(shè)一個關(guān)系為R,X和Y是它的兩個屬性集。若對于X上的每個值都有Y上的一個惟一值與之對應(yīng),則稱X和Y()。C具有函數(shù)依賴關(guān)系8下列符合第三范式的關(guān)系是()。B教師(編號,姓名,職稱)9一個關(guān)系中每條記錄和第二個關(guān)系的每條記錄進(jìn)行連接,所組成的新關(guān)系稱為()。C兩個關(guān)系的積10SQLSERVER提供的NCHAR、NVARCHAR、NTEXT等幾種雙字節(jié)數(shù)據(jù)類型實際上是一種()。AUNICODE數(shù)據(jù)類型11一個用戶訪問SQLSERVER通常要依次經(jīng)過4個層次的安全控制,分別是()。A操作系統(tǒng)、服務(wù)器、數(shù)據(jù)庫、表和列12下列哪些不屬于索引的類型()。D事務(wù)日志索引13SQLSERVER中進(jìn)行數(shù)據(jù)庫備份的SQL語句是()。BBACKUPDATABASE14在成績數(shù)據(jù)表中,要計算某課程的平均成績,可采用()。DAVG函數(shù)15設(shè)課程成績表的結(jié)構(gòu)為(學(xué)號,課程號,成績),如果希望查詢出“成績大于90分且課程號首字母為A的所有記錄”,則對應(yīng)的SQL語句是()。CSELECTFROM課程成績表WHERE成績90AND課程號LIKEA1計算機數(shù)據(jù)處理技術(shù)大致經(jīng)歷了(人工管理)、(文件管理)、(數(shù)據(jù)庫管理)等不同的發(fā)展階段。2數(shù)據(jù)庫系統(tǒng)由(外模式)、(模式)和(內(nèi)模式)三級抽象模式構(gòu)成。3數(shù)據(jù)庫管理系統(tǒng)的主要功能包括(數(shù)據(jù)定義)、(數(shù)據(jù)操縱)、(數(shù)據(jù)庫的運行管理)、(數(shù)據(jù)庫的建立和維護)。4關(guān)系模型由三部分組成(數(shù)據(jù)結(jié)構(gòu))、(關(guān)系操作集合)和(關(guān)系的完整性)。5SQLSERVER提供了大量易用的管理工具,比較常用的主要有(服務(wù)管理器)、(企業(yè)管理器)和(查詢分析器)。6數(shù)據(jù)文件的后綴是(MDF)。7事務(wù)日志文件的后綴是(LDF)。8SQLSERVER數(shù)據(jù)庫分為(系統(tǒng)數(shù)據(jù)庫)和(用戶數(shù)據(jù)庫)兩種類型。1SQL數(shù)據(jù)定義語言的主要作用是創(chuàng)建存儲數(shù)據(jù)的結(jié)構(gòu),而數(shù)據(jù)操縱語言的主要作用則是向數(shù)據(jù)庫中填寫數(shù)據(jù),具體包括(增加)、(刪除)、(修改)等操作。2當(dāng)需要對查詢結(jié)果進(jìn)行排序時,可以指定其排序方式,字段后使用(ASC)表示升序,(DESC)表示降序。3視圖是一個虛表,它是從(一個或多個基本表)中導(dǎo)出的表。1數(shù)據(jù)庫設(shè)計一般包括需求分析、概念設(shè)計、邏輯設(shè)計、物理設(shè)計、數(shù)據(jù)庫實施和運行維護等階段。2數(shù)據(jù)庫應(yīng)用系統(tǒng)的建設(shè)包括結(jié)構(gòu)設(shè)計和行為設(shè)計兩個方面。3數(shù)據(jù)庫設(shè)計的主要原則包括表設(shè)計原則、字段設(shè)計原則和其他原則。4ER圖的設(shè)計關(guān)鍵在于對實體、聯(lián)系的選擇和表示。5物理設(shè)計的主要內(nèi)容包括存儲記錄的格式設(shè)計、存儲方法設(shè)計、訪問方法設(shè)計以及完整性和安全性考慮。1數(shù)據(jù)庫系統(tǒng)的三級模式結(jié)構(gòu)是指數(shù)據(jù)庫系統(tǒng)由外模式、模式和內(nèi)模式三級抽象模式構(gòu)成。2備份是指將數(shù)據(jù)從硬盤復(fù)制到可移動媒體上的過程。3“實體一聯(lián)系”方法是描述數(shù)據(jù)庫概念模型的主要方法,一般稱這種方法為ER方法(或ER圖方法)。4用戶使用SQLSERVER數(shù)據(jù)庫時,一般需要經(jīng)過兩個安全性階段身份驗證和權(quán)限認(rèn)證。5ER圖設(shè)計一般在數(shù)據(jù)庫設(shè)計的概念設(shè)計階段使用。1關(guān)系模型由三個部分組成,分別是數(shù)據(jù)結(jié)構(gòu)、關(guān)系操作集合和關(guān)系的完整性。2備份是指將數(shù)據(jù)從硬盤復(fù)制到可移動媒體上的過程。3數(shù)據(jù)庫應(yīng)用系統(tǒng)的建設(shè)包括結(jié)構(gòu)設(shè)計和行為設(shè)計兩個方面。4關(guān)系完整性是指關(guān)系模型中數(shù)據(jù)的正確性、一致性和有效性。5SQLSERVER中的事務(wù)處理控制語句,ROLLBACKTRANSACTION實現(xiàn)回滾一個事務(wù)。1數(shù)據(jù)庫系統(tǒng)的三級模式結(jié)構(gòu)是指數(shù)據(jù)庫系統(tǒng)由外模式、模式和內(nèi)模式三級抽象模式構(gòu)成。2進(jìn)行數(shù)據(jù)庫備份時,必須同時復(fù)制主數(shù)據(jù)文件和事務(wù)日志文件。3“實體一聯(lián)系”方法是描述數(shù)據(jù)庫概念模型的主要方法,一般稱這種方法為ER方法(或ER圖方法)。4用戶使用SQLSERVER數(shù)據(jù)庫時,一般需要經(jīng)過兩個安全性階段身份驗證和權(quán)限認(rèn)證。1SQL語言共分為四大類,即數(shù)據(jù)定義語言,數(shù)據(jù)查詢語言,數(shù)據(jù)操縱語言和數(shù)據(jù)控制語言。2能夠惟一標(biāo)識某條記錄的屬性稱為主鍵。3關(guān)系的規(guī)范化程度可分為多個級別,但通常只需要達(dá)到第三范式即可。4備份是指將數(shù)據(jù)從硬盤復(fù)制到可移動媒體上的過程。1能夠惟一表示數(shù)據(jù)表中的每條記錄的字段或者字段的組合稱為主碼或主鍵()。2SQLSERVER數(shù)據(jù)庫中的NULL值(空值)表示的是“空格”或“0”值()3一個不規(guī)范的關(guān)系模式通常會引發(fā)插入異常、刪除異常和更新異常,導(dǎo)致大量的數(shù)據(jù)冗余。()4根據(jù)索引的特點,應(yīng)該對那些數(shù)據(jù)量大、查詢頻度較高、實時性要求強的基本表創(chuàng)建索引,()5數(shù)據(jù)庫設(shè)計是指對于一個給定的應(yīng)用環(huán)境,構(gòu)造最優(yōu)的數(shù)據(jù)庫模式,建立數(shù)據(jù)庫及其應(yīng)用系統(tǒng),有效存儲數(shù)據(jù),滿足用戶信息要求和處理要求。()6參照完整性規(guī)則通常是指在兩個參照和被參照關(guān)系中,參照關(guān)系中每條記錄的外鍵或者為空,或者等于被參照關(guān)系中某條記錄的主鍵。()1數(shù)據(jù)流圖是需求分析的常用工具之一,人們也經(jīng)常稱它為DFD圖()。2數(shù)據(jù)庫中只有一個模式,也只有一個內(nèi)模式,所以模式內(nèi)模式映像是惟一的。()。3SQLSERVER數(shù)據(jù)庫中的NULL值(空值)表示的是“空格”或“0”值()4SQLSERVER中的TEMPDB數(shù)據(jù)庫是一個臨時數(shù)據(jù)庫,屬用戶數(shù)據(jù)庫()5SQL雖被稱為“查詢語言”,其功能卻不僅僅限于查詢()1計算機數(shù)據(jù)處理技術(shù)大致經(jīng)歷了人工管理、文件管理和SQLSERVER數(shù)據(jù)庫管理三大階段()。2能夠惟一表示數(shù)據(jù)表中的每條記錄的字段或者字段的組合稱為主碼或主鍵()。3SQLSERVER數(shù)據(jù)庫中的NULL值(空值)表示的是“空格”或“0”值()4一個不規(guī)范的關(guān)系模式通常會引發(fā)插入異常、刪除異常和更新異常,導(dǎo)致大量的數(shù)據(jù)冗余。()5目前的關(guān)系數(shù)據(jù)庫系統(tǒng)一般都支持標(biāo)準(zhǔn)SQL語句()1DELETETABLE的功能是刪除表結(jié)構(gòu)。()2在教師任課關(guān)系(教師編號,教師姓名,教師職稱,課程號,課程名,課時費)中,主鍵是教師編號。()3觸發(fā)器是一種特殊的存儲過程,它基于一個表創(chuàng)建,可以針對多個表進(jìn)行操作。()4做結(jié)構(gòu)設(shè)計時,要盡量使設(shè)計符合第三范式的要求。()5登錄賬號用于身份驗證,用戶賬號用于權(quán)限驗證。()請您刪除一下內(nèi)容,O_O謝謝2016年中央電大期末復(fù)習(xí)考試小抄大全,電大期末考試必備小抄,電大考試必過小抄BASKETBALLCANMAKEATRUECLAIMTOBEINGTHEONLYMAJORSPORTTHATISANAMERICANINVENTIONFROMHIGHSCHOOLTOTHEPROFESSIONALLEVEL,BASKETBALLATTRACTSALARGEFOLLOWINGFORLIVEGAMESASWELLASTELEVISIONCOVERAGEOFEVENTSLIKETHENATIONALCOLLEGIATEATHLETICASSOCIATIONNCAAANNUALTOURNAMENTANDTHENATIONALBASKETBALLASSOCIATIONNBAANDWOMENSNATIONALBASKETBALLASSOCIATIONWNBAPLAYOFFSANDITHASALSOMADEAMERICANHEROESOUTOFITSPLAYERANDCOACHLEGENDSLIKEMICHAELJORDAN,LARRYBIRD,EARVIN“MAGIC“JOHNSON,SHERYLSWOOPES,ANDOTHERGREATPLAYERSATTHEHEARTOFTHEGAMEISTHEPLAYINGSPACEANDTHEEQUIPMENTTHESPACEISARECTANGULAR,INDOORCOURTTHEPRINCIPALPIECESOFEQUIPMENTARETHETWOELEVATEDBASKETS,ONEATEACHENDINTHELONGDIRECTIONOFTHECOURT,ANDTHEBASKETBALLITSELFTHEBALLISSPHERICALINSHAPEANDISINFLATEDBASKETBALLSRANGEINSIZEFROM28530IN7276CMINCIRCUMFERENCE,ANDINWEIGHTFROM1822OZ510624GFORPLAYERSBELOWTHEHIGHSCHOOLLEVEL,ASMALLERBALLISUSED,BUTTHEBALLINMENSGAMESMEASURES29530IN7576CMINCIRCUMFERENCE,ANDAWOMENSBALLIS28529IN7274CMINCIRCUMFERENCETHECOVERINGOFTHEBALLISLEATHER,RUBBER,COMPOSITION,ORSYNTHETIC,ALTHOUGHLEATHERCOVERSONLYAREDICTATEDBYRULESFORCOLLEGEPLAY,UNLESSTHETEAMSAGREEOTHERWISEORANGEISTHEREGULATIONCOLORATALLLEVELSOFPLAY,THEHOMETE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