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Introduction to SQL

Introduction to SQL
Which of the following command makes the updates performed by the transaction permanent in the database?

ROLLBACK
DELETE
COMMIT
TRUNCATE

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Introduction to SQL
The ADD command is used to enter one row of data or to add multiple rows as a result of a query.

True
False

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Introduction to SQL
The SQL keyword(s) ________ is used with wildcards.

IN and NOT IN
NOT IN only
IN only
LIKE only

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Introduction to SQL
The SQL statementSELECT SUBSTR('abcdefghij', INSTR('123321234', '2', 3, 2), 2) FROM DUAL;prints

ab
23
gh
bc

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Introduction to SQL
Indexes can usually be created for both primary and secondary keys.

True
False

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Introduction to SQL
SQL can be used to:

query database data only.
create database structures only.
modify database data only.
All of these

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