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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?

DELETE
COMMIT
TRUNCATE
ROLLBACK

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Introduction to SQL
The FROM SQL clause is used to...

specify search condition
specify what table we are selecting or deleting data FROM
None of these
specify range for search condition

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Introduction to SQL
The benefits of a standard relational language include which of the following?

Reduced training costs
Applications are not needed
All of these
Increased dependence on a single vendor

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Introduction to SQL
The command to remove rows from a table 'CUSTOMER' is:

DROP FROM CUSTOMER ...
DELETE FROM CUSTOMER WHERE ...
UPDATE FROM CUSTOMER ...
REMOVE FROM CUSTOMER ...

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Introduction to SQL
Find all the cities whose humidity is 89

SELECT city FROM weather WHERE humidity = 89;
SELECT city FROM weather;
SELECT city WHERE humidity = 89;
SELECT humidity = 89 FROM weather;

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

COMMIT
TRUNCATE
DELETE
ROLLBACK

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