Ask a Question

The primary key must be

in Education by
The primary key must be (a) Unique (b) Not null (c) Both Unique and Not null (d) Either Unique or Not null This question was addressed to me in class test. The question is from Null Values Operations topic in chapter SQL : Queries, Constraints and Triggers of Database Management Select the correct answer from above options Interview Questions and Answers, Database Interview Questions and Answers for Freshers and Experience

1 Answer

0 votes
by
Correct option is (c) Both Unique and Not null Explanation: Primary key must satisfy unique and not null condition for sure.

Related questions

0 votes
Q: Remote backup system must be _________ with the primary site.Select the correct answer from above options
    Remote backup system must be _________ with the primary site. (a) Synchronised (b) Separated (c) ... Backup Systems topic in chapter Recovery System of Database Management...
asked Oct 11, 2021 in Education by JackTerrance
0 votes
Q: Which one of the following attribute can be taken as a primary key?
    Which one of the following attribute can be taken as a primary key? (a) Name (b) Street (c) Id ... and Answers, Database Interview Questions and Answers for Freshers and Experience...
asked Oct 11, 2021 in Education by JackTerrance
0 votes
Q: If every non-key attribute is functionally dependent primary key, then the relation will be in
    If every non-key attribute is functionally dependent primary key, then the relation will be in (a) First ... , Database Interview Questions and Answers for Freshers and Experience...
asked Oct 11, 2021 in Education by JackTerrance
0 votes
Q: Which of the following can be used as a primary key entry of the instructor relation.
    Which of the following can be used as a primary key entry of the instructor relation. (a) DEPT_NAME ... in section Database Systems Design and Implementation of Database Management...
asked Oct 10, 2021 in Education by JackTerrance
0 votes
Q: Identifying primary key for a vote table
    I am working on a voting table design using Postgres 9.5 (but maybe the question itself is applicable ... Questions for Interview, JavaScript MCQ (Multiple Choice Questions)...
asked Jul 26, 2022 in Education by JackTerrance
0 votes
Q: Identifying primary key for a vote table
    I am working on a voting table design using Postgres 9.5 (but maybe the question itself is applicable ... Questions for Interview, JavaScript MCQ (Multiple Choice Questions)...
asked Jul 20, 2022 in Education by JackTerrance
0 votes
Q: Sql returns empty row on combinning primary key with another value in where clause
    I am getting empty row on following sql SELECT * FROM flyers WHERE fId='6' AND 'userId'='400' ... JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)...
asked Jun 8, 2022 in Education by JackTerrance
0 votes
Q: Duplicate entry '2' for key 'PRIMARY' on Auto Modeller Update Function in Kohana
    Am trying to perform an update and nothing seems to work. It has something to do with my callback ... Questions for Interview, JavaScript MCQ (Multiple Choice Questions)...
asked Feb 11, 2022 in Education by JackTerrance
0 votes
Q: 5. Which key defines a relationship between two tables?(a) Primary key(b) Foreign key
    5. Which key defines a relationship between two tables? (a) Primary key (b) Foreign key (b) Secondary key (d) ... Full form of RDBMS is Select the correct answer from above options...
asked Dec 21, 2021 in Education by JackTerrance
0 votes
Q: 6. A primary key is a ………………. of unique values.7. Linking tables are created to facilitateDBMS uses the select distinct command to move out the dipiece of data.among two tables.
    6. A primary key is a . of unique values. 7. Linking tables are created to facilitate DBMS uses the ... . among two tables. 8 Select the correct answer from above options...
asked Nov 27, 2021 in Education by JackTerrance
0 votes
Q: An entity set that does not have sufficient attributes to form a primary key is termed a __________
    An entity set that does not have sufficient attributes to form a primary key is termed a __________ (a) ... , Database Interview Questions and Answers for Freshers and Experience...
asked Oct 11, 2021 in Education by JackTerrance
0 votes
Q: The relation with the attribute which is the primary key is referenced in another relation. The relation which has the attribute as a primary key is called ______________
    The relation with the attribute which is the primary key is referenced in another relation. The relation ... Database Interview Questions and Answers for Freshers and Experience...
asked Oct 11, 2021 in Education by JackTerrance
0 votes
Q: ____________ is a combination of two of more attributes used as a primary key
    ____________ is a combination of two of more attributes used as a primary key (a) Composite Key (b) ... , Database Interview Questions and Answers for Freshers and Experience...
asked Oct 11, 2021 in Education by JackTerrance
0 votes
Q: In which of the following, a separate schema is created consisting of that attribute and the primary key of the entity set.
    In which of the following, a separate schema is created consisting of that attribute and the primary key ... , Database Interview Questions and Answers for Freshers and Experience...
asked Oct 11, 2021 in Education by JackTerrance
0 votes
Q: Which algorithm uses equality comparison on a key attribute with a primary index to retrieve a single record that satisfies the corresponding equality condition.
    Which algorithm uses equality comparison on a key attribute with a primary index to retrieve a single ... Database Interview Questions and Answers for Freshers and Experience...
asked Oct 11, 2021 in Education by JackTerrance

© Copyright 2018-2023 www.Blogmepost.com. All rights reserved. Developed by Blogmepost.

...