!!!数据库考试题及答案.pdf

习题 一、 [12 分] 用英文解释 1、 DBMS 2、Data Dictionary 3、Transaction[10 分] 二、单项选择题 1．There may be instances where an attribute has a set of values for a specific entity. This type of attribute is said to be 【】 A ．single valued attribute B ．multivalued attribute Ｃ．simple attribute D ．composite attribute 2 ．In a particular bank, a loan can belong to only one customer, and a customer can have several loans, then the relationship set fromcustomer to loan is 【】 A ．one to many B ．many to many C．many to one D ．one to one 3．A 【】contains metadata ─ that is, data about data. A ．table B．view C．data dictionary D ．trigger 4 ．The phrase ―greater than at least one ‖ is represented in SQL by【】 A ．all B ．all C．some D ．some 5．In general, all aggregate functions except 【】ignore null values in their input collection. A ．sum B ．avg C．min D ．count 6 ．If a schedule S can be transformed into a schedule S ‘by a series of swaps of non-conflicting instructions, we say that S and S e 【】 ‘ ar A ．non-conflicting equivalent B ．conflict equivalent C．non-conflicting serializable D ．conflict serializable 7．The fundamental operations in the relational algebra are【】。 A ． ∪，-， ×， π和 σ B ． ∪，-，∞， π和 σ C． ∪， ∩，×， π和 σ D ． ∪， ∩，∞， π和 σ 8．In SQL, =some is identical to in, and 【】is identical to not in。 A ．some B．=all C．all D ．=some 9．The result of true and null is 【】。 A ．null B ．true C．false D ．not null 10．The function sum applied on the collection {1,1,3,4,4,11} returns the value 【】. A ．24 B ．6 C．4 D ．11 1 三、 [10 分] 设有 Course(课程 )、Teacher(教师 )、Student(研究生 )，其中： Course 有属性 cno(课程号 ) 、cname(课程名 )和 mark(学分 )； Teacher有属性 tno(教师编号 )、tname(教师姓名 )和 major(专业属