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Introduction to SQL

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

None of these
IS NULL operator
NOT operator
EXISTS operator

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Introduction to SQL
SQL is a programming language.

False
True

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Introduction to SQL
Table Employee has 10 records. It has a non-NULL SALARY column which is also UNIQUE.The SQL statementSELECT COUNT(*) FROM Employee WHERE SALARY > ANY (SELECT SALARY FROM EMPLOYEE);prints

5
0
10
9

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Introduction to SQL
ON UPDATE CASCADE ensures which of the following?

Materialized Views
All of these
Data Integrity
Normalization

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

DELETE
TRUNCATE
ROLLBACK
COMMIT

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Introduction to SQL
Which of the SQL statements is correct?

SELECT Username, Password FROM Users
None of these
SELECT Username, Password WHERE Username = 'user1'
SELECT Username AND Password FROM Users

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