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Recent questions tagged gb2019dbms1
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GATEBOOK2019DBMS11
Given two relations $R_1$ and $R_2,$ where $R_1$ contains $N_1$ tuples, $R_2$ contains $N_2$ tuples, and $N_2 > N_1 > 0,$ give the minimum possible sizes (in tuples) for the resulting relation produced by each of the following relational algebra expressions. In each case, state any assumptions ... $(1)  N_2; (2)  0; (3)  0; (4)  N_1 \times N_2; (5)  N_1$
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Nov 30, 2018
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gb2019dbms1
relationalalgebra
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GATEBOOK2019DBMS12
Suppliers(sid: integer, sname: string, address: string) Parts(pid: integer, pname: string, color: string) Catalog(sid: integer, pid: integer, cost: real) Suppose we want to find names of those suppliers who supply all the parts. Consider the following ... .sid) Which of the following query is the correct implementation of above requirement ? Only Q1 Only Q2 Both Q1 and Q2 None
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Nov 30, 2018
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gb2019dbms1
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GATEBOOK2019DBMS13
Suppose that two relations $R(A, B)$ and $S(A, B)$ have exactly the same schema. Consider the following equalities in relational algebra? $R \cap S = R  (R  S)$ $R \cap S = S  (S  R)$ $R \cap S = R \text{ NATURALJOIN }S$ $R \cap S = R \times S$ Which of the equalities hold in relational algebra? I only I and II only I, II and III I, II, III and IV
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Nov 30, 2018
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gb2019dbms1
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GATEBOOK2019DBMS14
The table Arc(x,y) currently has the following tuples (note there are duplicates): $(1,2), (1,2), (2,3), (3,4), (3,4), (4,1), (4,1), (4,1), (4,2).$ Compute the result of the query: SELECT a1.x, a2.y, COUNT(*) FROM Arc a1, Arc a2 WHERE a1.y = a2.x GROUP BY a1 ... following tuples is in the result? $(1,3,2)$ $(2,4,6)$ $(3,1,4)$ $(3,1,6)$ I and III I and II I and IV II and III
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Nov 30, 2018
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79
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gb2019dbms1
sql
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GATEBOOK2019DBMS15
The relation $R(a,b)$ may have duplicate tuples. Which of the following queries has a result that is guaranteed not to have duplicates, regardless of what tuples $R$ contains? SELECT a FROM R WHERE a = 1 SELECT MAX(b) FROM R GROUP BY a SELECT a, b FROM R GROUP BY a, b SELECT a FROM R WHERE a NOT IN (SELECT a FROM R) III and IV I and II III only I and III
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Nov 30, 2018
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gb2019dbms1
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1
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GATEBOOK2019DBMS16
Consider the following database schema: Frequents(kid, store) Sells(store, candy) Likes(kid, candy) Table Frequents indicates what candy stores a kid likes to visit. Table Sells shows which candy each store sells. Table Likes tells which candy a kid likes. ... candies are all sold by the store 'Starbucks'. the kids whose liked candies are sold by stores other than 'Starbucks'
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Nov 30, 2018
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127
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gb2019dbms1
sql
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GATEBOOK2019DBMS17
Consider a relation $R(A,B)$, and the following two sequences of queries. Q1: UPDATE R SET B = 3 WHERE B = 2; Q2: INSERT INTO R SELECT A, 3 FROM R WHERE B = 2; DELETE FROM R WHERE B = 2; Which of the following statements is TRUE? Q1 ... produce the same answer. The answer to Q1 is always contained in the answer to Q2 The answer to Q2 is always contained in the answer to Q1.
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Nov 30, 2018
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gb2019dbms1
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GATEBOOK2019DBMS18
Suppose we have a relation declared by: CREATE TABLE R(name VARCHAR(50) PRIMARY KEY, salary INT CHECK(salary \leq 40000) ); Initially, the relation has three records: Name Salary Tom 10000 Joe 20000 Sue 30000 We execute the following sequence of modifications. Some of them may be ... , the sum of the salaries over all the tuples in $R$ is: $52,000$ $62,000$ $65,000$ $72,000$
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Nov 30, 2018
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66
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gb2019dbms1
+2
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1
answer
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GATEBOOK2019DBMS19
Suppose relation $R(A,B)$ has tuples $\{(1,2), (1,2), (3,4)\}$, and relation $S(B,C)$ has ${(2,5), (2,5), (4,6), (7,8)}$. What is the number of tuples in the result of the SQL query: SELECT * FROM R NATURAL RIGHT OUTER JOIN S; $2$ $3$ $5$ $6$
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Nov 30, 2018
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84
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gb2019dbms1
+1
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1
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GATEBOOK2019DBMS110
Given two relations $R(A,B)$ and $S(C)$, consider two queries: Q1: SELECT A FROM R WHERE R.B > ALL (SELECT C FROM S); Q2: SELECT A FROM R WHERE R.B > ANY (SELECT C FROM S); Which of the following statements is TRUE? Q1 and Q2 ... . The answer to Q1 is always contained in the answer to Q2. The answer to Q2 is always contained in the answer to Q1. None of the above.
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Nov 30, 2018
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gb2019dbms1
0
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GATEBOOK2019DBMS111
Consider a relation $R(A)$ and the following two queries. Q1: SELECT A FROM R r1 WHERE NOT EXISTS (SELECT * FROM R WHERE A > r1.A); Q2: SELECT MAX(A) FROM R; Let $\mid Q1 \mid$ and $\mid Q2 \mid$ be the number of the tuples in the results of Q1 and Q2, ... $\mid Q1 \mid \leq \mid Q2 \mid$ is always true. $\text{None of the above}$
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Nov 30, 2018
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gb2019dbms1
+5
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1
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GATEBOOK2019DBMS112
The SQL statement 'DELETE from R;' is guaranteed to remove all the tuples from R. may remove just some tuples from R. may also remove tuples in tables other than R. will drop table R from the database.
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Nov 30, 2018
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Databases
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GATEBOOK
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117
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gb2019dbms1
+1
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0
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GATEBOOK2019DBMS113
It is not possible to capture which ER concept in a relational schema? Onetoone relationships. Onemany mandatory participation. Manymany mandatory participation. Ternary relationships.
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Nov 30, 2018
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gb2019dbms1
+2
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2
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GATEBOOK2019DBMS114
EMPLOYEE: ename, eid, dno, salary DEPARTMENT: dno, dname Consider the below tuple relational calculus query ... the employee with the highest salary among all employees. Who work in the department that has the employee with the lowest salary among all employees
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Nov 30, 2018
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gb2019dbms1
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GATEBOOK2019DBMS115
Consider the relation employee(name, sex, supervisorName, salary) with name as the key, supervisorName gives the name of the supervisor of the employee under consideration. What does the following Tuple Relational Calculus query produce? ... than salaries of their subordinates. Names of female employees whose salary is greater than the salaries of their subordinates.
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Nov 30, 2018
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gb2019dbms1
+1
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1
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GATEBOOK2019DBMS116
Which of the following tuple relational calculus query is unsafe query? $\{x\mid \exists x\in T(x.A\neq 500)\}$ $\{x\mid \forall x\in T(x.A\neq 500)\}$ $\{x\mid \neg (\forall x\in T(x.A\neq 500))\}$ Only III Only II and III Only I and III All of I,II and III
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Nov 30, 2018
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gb2019dbms1
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GATEBOOK2019DBMS117
Which of the following entity sets or relationships does not get converted to a relation? B C R S
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Nov 30, 2018
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gb2019dbms1
erdiagram
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GATEBOOK2019DBMS118
Which of the following is not a property of ACID transactions ? Atomicity Concurrency Durability Isolation
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Nov 30, 2018
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0
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GATEBOOK2019DBMS119
Consider the following SQL queries: Q1: Select distinct a from R where b>0; Q2: Select distinct a from R where b>0 group by a; Q1 and Q2 produce the same answer. The answer to Q1 is always contained in the answer to Q2. The answer to Q2 is always contained in the answer to Q1. Q1 and Q2 produce different answers.
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Nov 30, 2018
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gb2019dbms1
+3
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0
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GATEBOOK2019DBMS120
Which of the following queries might produce different results when evaluated using set semantics and bag (multiset) semantics, even if the relations $R$ and $S$ are themselves sets (i.e., they contain no duplicate tuples)? $R−S$ $R\bowtie S − S \bowtie R$ $R \cup S$ $\sigma_{a=5}(R)$
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Nov 30, 2018
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gb2019dbms1
relationalalgebra
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2
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21
GATEBOOK2019DBMS121
Which of the following tuple relational calculus expressions is equivalent to $\exists t \in r F(t)$ ? $\neg (\forall t \in r \neg F(t))$ $\neg (\forall t \in r F(t))$ $\exists t \in r \neg F(t))$ $\exists t \notin r F(t))$
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Nov 30, 2018
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gb2019dbms1
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GATEBOOK2019DBMS122
Graph $(V_i,V_j)$ is a relation which records adjacency information of an undirected graph. Tuple (a,b) represents the adjacency between vertices a and b. Consider the following statements There is a route from some vertex A to some vertex B in the ... of the above statements can be represented in Tuple Relational Calculus ? Only I Only II and III Only I and III Only III
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Nov 30, 2018
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Databases
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GATEBOOK
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65
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gb2019dbms1
+2
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1
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GATEBOOK2019DBMS123
Consider a relation R(A,B) that contains r tuples, and a relation S(B,C) that contains s tuples. Assume $r>0, s>0.$ Make no assumptions about keys. Consider the below query. $\Pi_B(R)−(\Pi_B(R)−\Pi_B(S))$ Minimum and Maximum no of tuples above query can produce ? Max (r,s), r+s $0,r \times s$ 0, Min (r,s) r,r
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Nov 30, 2018
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GATEBOOK
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gb2019dbms1
+2
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1
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24
GATEBOOK2019DBMS124
Consider the following relation: Family(parent, child, childDOB) The intent is that a tuple (p,c,d) means that parent p has child c, who was born on date d. You may assume that parents do not have two children of the same name, and that there are no ... of 'Raju.' Which of the above queries are expressible in relational algebra? I only I and II only III only I, II and III
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Nov 30, 2018
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gb2019dbms1
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25
GATEBOOK2019DBMS125
Consider the following E/R diagram: Below are three possible relationship sets for this E/R diagram: $A$ $B$ $C$ $D$ $a_1$ $b_1$ $c_1$ $d_1$ $a_1$ $b_1$ $c_1$ $d_2$ $A$ $B$ $C$ $D$ $a_1$ $b_1$ $c_1$ $d_1$ $a_1$ $b_1$ $c_2$ $d_2$ ... not equal to $d_2$. Which of the above could not be the relationship set for the E/R diagram? I Only I and II Only II Only I,II and III
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Nov 30, 2018
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