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DBMS MCQ
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- 10th Jun, 2022
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Following are mostly asked Dbms MCQ test that are designed for professionals like you to crack you interviews. You can take this Dbms online test before appearing to you real interview. This Dbms quiz there are around 30+ multiple choice questions on Dbms with four options.
1) A relational database consists of a collection of
2) A ________ in a table represents a relationship among a set of values.
3) The term _______ is used to refer to a row.
4) The term attribute refers to a ___________ of a table.
5) For each attribute of a relation, there is a set of permitted values, called the ________ of that attribute.
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6) A domain is atomic if elements of the domain are considered to be ____________ units.
7) The tuples of the relations can be of ________ order.
8) Consider attributes ID, CITY and NAME. Which one of this can be considered as a super key?
9) A _____ is a property of the entire relation, rather than of the individual tuples in which each tuple is unique.
10) Which one of the following attribute can be taken as a primary key?
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11) Which one of the following cannot be taken as a primary key?
12) Using which language can a user request information from a database?
13) Student(ID, name, dept name, tot_cred) In this query which attributes form the primary key?
14) Which one of the following is a procedural language?
15) The _______operation performs a set union of two “similarly structured” tables
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16) The most commonly used operation in relational algebra for projecting a set of tuple from a relation is
17) The _______ operator takes the results of two queries and returns only rows that appear in both result sets.
18) What type of statement is this?
19) To remove a relation from an SQL database, we use the ______ command.
20) Updates that violate __________ are disallowed.
21) The ________ clause is used to list the attributes desired in the result of a query.
22) In SQL the spaces at the end of the string are removed by _______ function.
23) _____ operator is used for appending two strings.
24) The union operation is represented by
25) The intersection operator is used to get the _____ tuples.
26) If we want to retain all duplicates, we must write ________ in place of union.
27) The number of attributes in relation is called as its
28) _____ clause is an additional filter that is applied to the result.
29) _________ joins are SQL server default
30) The _____________ is essentially used to search for patterns in target string.
31) A _____ indicates an absent value that may exist but be unknown or that may not exist at all.
32) Using the ______ clause retains only one copy of such identical tuples
33) The primary key must be
34) The result of _____unknown is unknown.
35) Aggregate functions are functions that take a ___________ as input and return a single value.
36) All aggregate functions except _____ ignore null values in their input collection.
37) A Boolean data type that can take values true, false, and________
38) The phrase “greater than at least one” is represented in SQL by _____
39) We can test for the nonexistence of tuples in a subquery by using the _____ construct.
40) Which of the following creates a temporary relation for the query on which it is defined?
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