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91
MADE EASY TEST SERIES
Unique not null is equivalent to primary key. Relational Algebra and SQL has same expressive power. Which of the above statements are False?
Sajal Mallick
asked
in
Databases
Nov 5, 2023
by
Sajal Mallick
351
views
made-easy-test-series
databases
sql
true-false
0
votes
0
answers
92
Hamburg University Exercise 4.1 Sizes of Relations
Given two relations R1 and R2 where R1 contains N1 tuples and R2 contains N2 tuples, give the minimum and maximum possible sizes (in tuples) for the relation produced by each of the following relational algebra expressions. Try to be as accurate as possible (i.e., formulate ... - (πB(R1) - πB(R2))| ≤ N1 (10): 0 ≤ |σA>B(R1) ∪ σA<B(R1)| ≤ N1
beginner
asked
in
Databases
Nov 1, 2023
by
beginner
201
views
databases
relational-algebra
0
votes
0
answers
93
Ace Academy Bits and Bytes
Assertion(a) : A relation R(ABC) is having 3 rows and results in 3 rows. Reason(r) : Natural Join join two tables based on all common columns with equality conditions. A . both 'a' and 'r' are true and 'r' is the correct ... 'a'. C. both 'a' and 'r' are false. D. 'a' is true but 'r' is false .
jaydip74
asked
in
Databases
Oct 29, 2023
by
jaydip74
226
views
bits
databases
ace-test-series
0
votes
0
answers
94
ER Diagram
Can someone please provide me with the correct explanation for this question
practicalmetal
asked
in
Databases
Oct 26, 2023
by
practicalmetal
364
views
er-diagram
databases
made-easy-test-series
er-to-relational
0
votes
1
answer
95
madeeasy
nihal_chourasiya
asked
in
Databases
Oct 14, 2023
by
nihal_chourasiya
224
views
made-easy-test-series
databases
0
votes
0
answers
96
Database.
T1: R1(A), W1(A), R1 (B). W1(B); T2: R2(A), W2(A), R2(B). W₂(B) S1: R2(A), W2(A), R1 (A), W1(A), R1 (B), W1(B), R2(B), W2(B) Find out whether S1 is conflict serializable. 2) S1 R2(A), W2(A), R2(B). W1 (A), R1 (B), W1 ... (Y) W₁(X) Find out whether S1 and S2 are conflict serializable schedules. S1 R1(x) R3(y) W1(x) W2(y) R3(x) W2(x) Find out whether S₁ is conflict serializable schedules.
khushwant2
asked
in
Databases
Oct 10, 2023
by
khushwant2
346
views
databases
–1
vote
1
answer
97
DBMS
Çșȇ ʛấẗẻ
asked
in
Algorithms
Oct 10, 2023
by
Çșȇ ʛấẗẻ
128
views
databases
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