Suppose you have the following relational DB. You may assume that no future instances of the relations will violate the keys that can be inferred to hold in the current instance : Generate relational Algebra queries for the following queries. List names of all male employees born after 1981.
Suppose you have the following relational DB. You may assume that no future instances of the relations will violate the keys that can be inferred to hold in the current instance : Generate relational Algebra queries for the following queries. List names of all male employees born after 1981.
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
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Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Suppose you have the following relational DB. You may assume that no future instances of the
relations will violate the keys that can be inferred to hold in the current instance :
Generate relational Algebra queries for the following queries.
- List names of all male employees born after 1981.
- List EmpNo and name of each of the female managers.
- List all cities in which projects are located and housing employees.
- List EmpNo and name of married employees.
- List EmpNo of employees who don’t work on any projects.
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Employee :
EmpNo Ename YOB
Empl
Emp2
Emp3
Emp4
Emp5
City
Sex DeptNo
Ali
1966
Gaza
M
D5
Sami
1975
Rafa
M
D5
Ali
1981
Gaza
M
D4
Reem
1988
Kan Yunes
F
D4
Mona
1981
Rafa
F
D1
Dependent :
EmpNo DependName Sex
Emp1
Empl
Empl
Emp5
Department :
YOB
Relationship
DeptNo
DeptName
Headquarters
Administration
MgrNo
Sameer
M
2000
Son
Emp5
Emp3
Empl
D1
Daughter
Spouse
Spouse
Salma
F
2001
D4
Lina
F
1977
D5
Research
Sameer
M
1977
WorksOn :
EmpNo
Empl
Emp2
Empl
Emp3
Emp2
Project :
ProjNo PName
ProjectX
ProjectY
ProjectZ
City
DeptNo
ProjNo
Hours
P1
Gaza
D1
P1
20
P2
Gaza
D4
P1
15
P3
Rafa
D1
P2
17
P3
15
P3
44
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