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Recent questions tagged relationalalgebra
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DBMS Relational Algebra
Which of the following Queries is more Efficient on the given data? 1. In terms of Space. 2. In terms of Calculation. also, How many calculations are necessary for Each?
asked
Mar 20
in
Databases
by
slowpoke
(
53
points)

61
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relationalalgebra
databases
0
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0
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2
Database Management Systems by Raghu Ramakrishnan, Johannes Gehrke ~ 2nd edition Q4.3.5
asked
Mar 11
in
Databases
by
Aman Janko
(
15
points)

70
views
databases
relationalalgebra
0
votes
1
answer
3
Uttrakhand Asst. Professor Exam51
Which of the following operation of relational algebra, selects certain columns from the table and discards the other columns? SELECT PROJECT DIVISION None of the above
asked
Mar 2
in
Others
by
gatecse
Boss
(
17.8k
points)

34
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uttarakhandasstprof2018
databases
relationalalgebra
+9
votes
2
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4
GATE201841
Consider the relations $r(A, B)$ and $s(B, C)$, where $s.B$ is a primary key and $r.B$ is a foreign key referencing $s.B$. COnsider the query $Q: r \bowtie (\sigma_{B<5} (s))$ Let LOJ denote the natural left outerjoin operation. Assume that $r$ and $s$ contain no null values. Which of ... (r \: LOJ \: s)$ $r \: LOJ \: (\sigma_{B<5} \bowtie (s))$ $\sigma_{B<5} (r) \: LOJ \: s$
asked
Feb 14
in
Databases
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gatecse
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17.8k
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1.2k
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gate2018
databases
relationalalgebra
normal
0
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0
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5
GeeksforGeeks Mock test 1
Consider the following collection of relation schemes: professor(profname, deptname) department(deptname, building) committee(profname,commname) Find all the professors who are in exactly (i.e., no more and no less) all those committees that Professor Smith is ... σprofname = Smith(committee)) R3 < Πcommname(committee)  R2 (committee / R2)  Πprofname(committee ⋈ R3)
asked
Feb 1
in
Databases
by
Utsav09
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1.1k
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47
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madeeasytestseries
geekmock2017
databases
sql
relationalalgebra
+1
vote
1
answer
6
Natural join
My answer is not matching with any of the option.so what is the correct answer
asked
Jan 24
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Databases
by
learner_geek
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4.6k
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129
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naturaljoin
databases
relationalalgebra
sql
+2
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0
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7
Relational algebra
I have two doubts: 1) A natural join B What will be the result when B don't have any tuple in it. Like in B their is relational algebra expression which is selecting Cars of green color but their is no green color car in table. What will be the ... B In above divison if B is a relational algebra expression returning nothing ( like the B in case 1). What will be the result ?
asked
Jan 14
in
Programming
by
♥_Less
Junior
(
957
points)

40
views
relationalalgebra
databases
relationalcalculus
joins
+1
vote
0
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8
Relational Algebra
what does this uniform distribution means?
asked
Jan 12
in
Databases
by
Pawan Kumar 2
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4.4k
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43
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relationalalgebra
0
votes
1
answer
9
Full Outer Join
Why is the minimum number of tuples in full outer join equal to max (m,n) ?
asked
Jan 10
in
Databases
by
hacker16
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2.6k
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89
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databases
fullouterjoin
relationalalgebra
+1
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0
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10
Joins
Consider two table R and S. Now suppose if we join the two tables using Natural Join (or any other Join for that matter), is it mandatory for the attributes (common attribute between R and S) must have the same range of values? (It's not mentioned that if it's dependent by a foreign key)
asked
Jan 9
in
Databases
by
Warlock lord
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3.4k
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30
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sql
databases
relationalalgebra
0
votes
1
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11
Calculate the number of tuples in the given query
asked
Jan 2
in
Databases
by
nishitshah
(
233
points)

48
views
databases
relationalalgebra
acetestseries
0
votes
0
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12
Number of tuples
Consider the relation schema: Student(roll no, name course no) Enroll(roll no, course no,course name) The number of tuples in the student and enroll table is 30 and 40 respectively The natural join is performed on roll no., what is max. and min. no. of tuples that are possible?
asked
Dec 16, 2017
in
Databases
by
srestha
Veteran
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81.7k
points)

98
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relationalalgebra
databases
naturaljoin
+2
votes
2
answers
13
#DBMS What will be the Minimum Number of Tuples?
asked
Dec 6, 2017
in
Databases
by
iarnav
Loyal
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6.5k
points)

135
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general
databases
relationalalgebra
naturaljoin
joins
0
votes
0
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14
relational calculus
asked
Dec 5, 2017
in
Databases
by
Parshu gate
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4.8k
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74
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relationalcalculus
databases
tuplerelationalcalculus
database
relationalalgebra
+1
vote
1
answer
15
Relational algebra
Consider the relations r1(P, Q, R) and r2(R, S, T) with primary keys P and R respectively. The relation r1 contains 2000 tuples and r2 contains 2500 tuples. The maximum size of the join r1⋈ r2 is equal to r2⋈ r1 true or false?
asked
Dec 3, 2017
in
Databases
by
learner_geek
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4.6k
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136
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relationalcalculus
joins
relations
relationalalgebra
databases
+3
votes
0
answers
16
REALTION ALGEBRA
Consider the following relations: The number of records resulted by the following relational algebra expression are _________?
asked
Dec 3, 2017
in
Databases
by
junaid ahmad
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8.8k
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113
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relationalalgebra
+2
votes
1
answer
17
relational algebra
Consider the following schema: Student (Sid, Sname, age) Course Info (Cid, Cname, Instructor SSN) Enroll (Sid, Cid, grade). The relational algebra expression for “find the Cid’s of courses enrolled by two different students” (no options)
asked
Dec 3, 2017
in
Databases
by
shaurya vardhan
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(
2.2k
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105
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databases
relationalalgebra
relations
relationalcalculus
+2
votes
1
answer
18
#dbms relational algebra
Consider the following relations A, B and C: A Id Name Age 12 Arun 60 15 Shreya 24 99 Rohit 11 B Id Name Age 15 Shreya 24 25 Hari 40 98 Rohit 20 99 Rohit 11 C Id Phone Area 10 2200 02 99 2100 01 How many tuples does the result of the following relational algebra expression contain? Assume that the schema of A∪B is the same as that of A. (A∪B)⋈A.Id>40∧C.Id<15C
asked
Dec 2, 2017
in
Databases
by
iarnav
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6.5k
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68
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databases
relationalalgebra
relations
0
votes
0
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19
ER model
If two tables A and B given with relationship table R. Min number of tables possible if below conditions given 1) R is 1:1 2) R is m:n 3)R is 1:m 4)R is m:1 5)total participation of A in R 6)total participation of A and B both in R
asked
Dec 2, 2017
in
Databases
by
learner_geek
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4.6k
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66
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relational
ertorelational
erdiagram
relationalalgebra
0
votes
1
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20
#DBMS QUERY
WHAT DOES THIS MEAN πR−S,S(r) PLEASE EXPLAIN WITH EXAMPLE; HOW TO PROJECT VALUES IN THIS CASE (ASSUME TABLE ON YOUR OWN). attributes in R(a,b,c) attributes in S(c)
asked
Dec 2, 2017
in
Databases
by
iarnav
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6.5k
points)

64
views
databases
relationalalgebra
+2
votes
1
answer
21
#DBMS Natural Join
Please kindly explain Natural Join by taking your own handmade example in layman terms. Thank you!
asked
Nov 27, 2017
in
Databases
by
iarnav
Loyal
(
6.5k
points)

106
views
databases
naturaljoin
relationalalgebra
sql
0
votes
1
answer
22
#dbms RELATIONAL ALGEBRA QUESTION
Information about a collection of students is given by the relation studInfo (studId, name, sex). The relation enroll (studId, courseId) gives which student has enrolled for (or taken) what course(s). Assume that every course is taken by ... which a proper subset of female students are enrolled. Courses in which only male students are enrolled. None of the above
asked
Nov 27, 2017
in
Databases
by
iarnav
Loyal
(
6.5k
points)

141
views
databases
relationalalgebra
0
votes
0
answers
23
database how to subtract these two relations!
asked
Nov 27, 2017
in
Databases
by
iarnav
Loyal
(
6.5k
points)

82
views
databases
relationalalgebra
0
votes
1
answer
24
database self doubt
what does this line means  Let r and s be two relations over the relation schemes R and S respectively and R has attribute A.
asked
Nov 27, 2017
in
Databases
by
iarnav
Loyal
(
6.5k
points)

52
views
databases
rdbmstables
relationalalgebra
+1
vote
0
answers
25
relational algebra question
Given two union compatible relations R1(A,B) and R2(C,D), what is the result of the operation R1 ⋈ (A=C∨B=D)R2? R1∪R2 R1×R2 R1–R2 R1∩R2
asked
Nov 27, 2017
in
Databases
by
iarnav
Loyal
(
6.5k
points)

74
views
relationalalgebra
databases
relations
joins
+1
vote
1
answer
26
Relational Algebra
asked
Nov 14, 2017
in
Databases
by
patry
(
213
points)

80
views
relationalalgebra
databases
+3
votes
1
answer
27
projection in relational algebra
For the relation instances A and B, A/B is the largest relation instance Q such that Q B ⊆ A. Consider A has exactly two fields x and y and B has just one field y with the same domain as in A. Division operation A/B is defined as the set of all x values (in the form of unary tuples) such ... A)  B) (C) πx(A)  πx((πx(A) B)  A) (D) πx(A)  πx((πx(B) A)  A)
asked
Nov 11, 2017
in
Databases
by
Parshu gate
Active
(
4.8k
points)

87
views
relationalalgebra
databases
relations
0
votes
0
answers
28
DBMS Relational Algebra
Let R1(a,b) = {(2,3),(3,2),(2,4),(2,5)},R2={(2,2),(3,3)} then find $\Pi_{AB(R1)}/\Pi_{B}(\sigma _{c>3}(R2))$
asked
Nov 9, 2017
in
Databases
by
Anjan
Active
(
1.7k
points)

92
views
databases
relationalalgebra
+2
votes
1
answer
29
Natural Join  R contains 75 tuples and S contains 25 tuples. What is the least and most number of tuples?
asked
Nov 9, 2017
in
Databases
by
techbrk3
(
455
points)

185
views
relationalalgebra
+1
vote
2
answers
30
Division in RA
Please explain me the division operation. Considering the two relations as below, R. A B C a1 b1 c1 a2 b1 c2 a1 b2 c2 a2 b2 c2 a1 b3 c3 Relation S, A a1 a2 What will be the result of R/S?
asked
Nov 3, 2017
in
Databases
by
AnilGoudar
Active
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4.4k
points)

121
views
databases
relationalalgebra
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