A.數(shù)據(jù)庫管理系統(tǒng)/用戶/操作系統(tǒng)
B.數(shù)據(jù)庫管理系統(tǒng)/硬件/操作系統(tǒng)
C.數(shù)據(jù)庫管理系統(tǒng)/操作系統(tǒng)/用戶
D.數(shù)據(jù)庫管理系統(tǒng)/用戶/軟件
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A.select staffno from staff where E_mail=NULL
B.select staffno from staff where E_mail NULL
C.select staffno from staff where E_mail is NULL
D.select staffno from staff where E_mail is not NULL
A.SELECT price FROM book WHERE book_name=“數(shù)據(jù)庫*”
B.SELECT price FROM book WHERE book_name LIKE“數(shù)據(jù)庫*”
C.SELECT price FROM book WHERE book_name=“數(shù)據(jù)庫%”
D.SELECT price FROM book WHERE book_name LIKE“數(shù)據(jù)庫%”
A.DROP SCHEMA
B.CREATE TABLE
C.DROP VIEW
D.DROP INDEX
A.由可以區(qū)分該關(guān)系模式中的任何元組的單個屬性組成
B.由任意多個屬性組成
C.由一個或多個能區(qū)分該關(guān)系模式中任何元組的單個或多個屬性組成
D.由任意單個屬性組成
A.層次模型
B.網(wǎng)狀模型
C.實體與關(guān)系模型
D.關(guān)系模型
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