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Introduction to SQL

Introduction to SQL
Which command undo all the updates performed by the SQL in the transaction?

COMMIT
ROLLBACK
TRUNCATE
DELETE

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Introduction to SQL
Which of the following join is also called as an 'inner-join'?

Non-Equijoin
None of these
Self-Join
Equijoin

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Introduction to SQL
Each index consumes extra storage space and also requires overhead maintenance time whenever indexed data change value.

True
False

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Introduction to SQL
What operator tests column for the absence of data?

EXISTS operator
None of these
NOT operator
IS NULL operator

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Introduction to SQL
SQL data definition commands make up a(n) ________ .

DML
DDL
XML
HTML

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Introduction to SQL
The qualifier DISTINCT must be used in an SQL statement when we want to eliminate duplicate rows.

False
True

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