Sql Interview Questions and Answers

Sql Interview QUESTIONS AND ANSWERS :: part9 : 1 to 5

Following SQL Multiple choice objective type questions and answers will help you in many software compnaies written examinations and inteview 2015 :

1.Which of the constraint can be enforced one per table ?

Primary key constraint

Not Null constraint

Foreign Key constraint

Check constraint

2.Let the statement : SELECT column1 FROM myTable; return 10 rows. The statement : SELECT ALL column1 FROM myTable; will return

less than 10 rows

more than 10 rows

exactly 10 rows

None of the Mentioned

3.Which of the following is a foreign key constraint ?

NO ACTION

CASCADE

SET NULL

All of the mentioned

4.Which of the following is illegal?

SELECT SYSDATE – SYSDATE FROM DUAL;

SELECT SYSDATE – (SYSDATE – 2) FROM DUAL;

SELECT SYSDATE – (SYSDATE + 2) FROM DUAL;

None of the Mentioned

5.Purpose of foreign key constraint in SQL Server is :

FOREIGN KEY constraints identify and enforce the relationships between tables.

A foreign key in one table points to a candidate key in another table

You cannot insert a row with a foreign key value, except NULL, if there is no candidate key with that value

None of the mentioned

More Sql Interview QUESTIONS AND ANSWERS available in next pages

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