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Advanced SQL - Database MCQ Questions and answers- Technical Aptitude

(Database) mcq questions and answers with easy and logical explanations for various competitive examination, interview and entrance test. Database Mcq question are important for technical exam and interview. Page-3 section-1

21
A transaction is the complete set of closely related update commands that must all be done, or none of them done, for the database to remain valid.
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Answer: Option A
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22
When AUTOCOMMIT is set on, changes will be made automatically at the end of each SQL statement.
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Answer: Option A
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23
The UNION clause is used to combine the output from multiple queries together into a single result table.
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Answer: Option A
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24
ROLLBACK WORK asks SQL to empty the log file.
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Answer: Option A
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25
The most frequently used relational operation, which brings together data from two or more related tables into one resultant table, is called an equi-join.
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Answer: Option B
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26
Outer join is the same as equi-join, except one of the duplicate columns is eliminated in the result table.
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Answer: Option B
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27
A correlated subquery is where the outer query depends on data from the inner query.
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Answer: Option B
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28
A function returns one value and has only output parameters.
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Answer: Option B
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29
With the UNION clause, each query involved must output the same number of columns, and they must be UNION compatible.
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Answer: Option A
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