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SQL Interview Questions with Answers - Set 2
Posted Date: 06 Feb 2008 Resource Type: Articles/Knowledge Sharing Category: General
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Posted By: Bala Member Level: Diamond
Rating:  Points: 3
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SQL Interview Questions - Set 2
1. What is the use of CASCADE CONSTRAINTS?
When this clause is used with the DROP command, a parent table can be dropped even when a child table exists.
2. Why does the following command give a compilation error?
DROP TABLE &TABLE NAME; Variable names should start with an alphabet. Here the table name starts with an '&' symbol.
3. Which system tables contain information on privileges granted and privileges obtained?
USER_TAB_PRIVS_MADE, USER_TAB_PRIVS_RECD
4. Which system table contains information on constraints on all the tables created?obtained?
USER_CONSTRAINTS.
5. What is the difference between TRUNCATE and DELETE commands?
6. State true or false. !=, <>, ^= all denote the same operation?
True.
7. State true or false. EXISTS, SOME, ANY are operators in SQL?
True.
8. What will be the output of the following query?
SELECT REPLACE(TRANSLATE(LTRIM(RTRIM('!! ATHEN !!','!'), '!'), 'AN', '**'),'*','TROUBLE') FROM DUAL;?
9. What does the following query do?
SELECT SAL + NVL(COMM,0) FROM EMP;?
This displays the total salary of all employees. The null values in the commission column will be replaced by 0 and added to salary.
10. What is the advantage of specifying WITH GRANT OPTION in the GRANT command?
The privilege receiver can further grant the privileges he/she has obtained from the owner to any other user.
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