2025年数据库系统工程师考试数据库系统数据转换技术试卷.docx

2025年数据库系统工程师考试数据库系统数据转换技术试卷

考试时间：______分钟总分：______分姓名：______

一、关系代数与SQL语句的转换

要求：本部分主要考查考生对关系代数和SQL语句的理解和转换能力。请根据给定的关系代数表达式，写出相应的SQL语句。

1.关系代数表达式：πA,B(R)(σA=5(R))

A.SELECTA,BFROMRWHEREA=5

B.SELECTA,BFROMRWHEREB=5

C.SELECTA,BFROMRWHEREA=5ANDB=5

D.SELECTA,BFROMRWHEREA=5ORB=5

2.关系代数表达式：πA,B,C(R)(σA=5,B10(R))

A.SELECTA,B,CFROMRWHEREA=5ANDB10

B.SELECTA,B,CFROMRWHEREA=5ORB10

C.SELECTA,B,CFROMRWHEREA=5ANDB=5

D.SELECTA,B,CFROMRWHEREA=5ORB=5

3.关系代数表达式：πA,B(R)(σA≥5,B≤10(R))

A.SELECTA,BFROMRWHEREA=5ANDB=10

B.SELECTA,BFROMRWHEREA=5ORB=10

C.SELECTA,BFROMRWHEREA=5ANDB=10

D.SELECTA,BFROMRWHEREA=5ORB=10

4.关系代数表达式：πA,B,C(R)(σA=5,B10(R)∩σA10,B20(R))

A.SELECTA,B,CFROMRWHEREA=5ANDB10ANDA10ANDB20

B.SELECTA,B,CFROMRWHEREA=5ORB10ORA10ORB20

C.SELECTA,B,CFROMRWHEREA=5ANDB10ORA10ANDB20

D.SELECTA,B,CFROMRWHEREA=5ORB10ANDA10ORB20

5.关系代数表达式：πA,B(R)(σA=5(R)∪σA=10(R))

A.SELECTA,BFROMRWHEREA=5ORA=10

B.SELECTA,BFROMRWHEREA=5ANDA=10

C.SELECTA,BFROMRWHEREA=5ORA≠10

D.SELECTA,BFROMRWHEREA=5ANDA≠10

6.关系代数表达式：πA,B(C)(πA,B(C)∩πA,B(D))

A.SELECTA,BFROMCWHEREAIN(SELECTA,BFROMD)

B.SELECTA,BFROMCWHEREA,BIN(SELECTA,BFROMD)

C.SELECTA,BFROMCWHEREA,BNOTIN(SELECTA,BFROMD)

D.SELECTA,BFROMCWHEREA,BNOTIN(SELECTA,BFROMD)ANDA,BIN(SELECTA,BFROMD)

7.关系代数表达式：πA,B(C)(πA,B(C)-πA,B(D))

A.SELECTA,BFROMCWHEREA,BNOTIN(SELECTA,BFROMD)

B.SELECTA,BFROMCWHEREA,BIN(SELECTA,BFROMD)

C.SELECTA,BFROMCWHEREA,BNOTIN(SELECTA,BFROMD)ANDA,BIN(SELECTA,BFROMD)

D.SELECTA,BFROMCWHEREA,BIN(SELECTA,BFROMD)ANDA,BNOTIN(SELECTA,BFROMD)

8.关系代数表达式：πA,B(C)(πA,B(C)∪πA,B(D))

A.SELECTA,BFR