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Some of Top Sql Aptitude Questions for

Top Sql Aptitude Questions for Aptitude

Some SQL Aptitude questions for Aptitude Preparations

Q  Which  is  the  subset  of  SQL  commands  used  to  manipulate  Oracle  Database
structures, including tables?
Data Definition Language (DDL)

Q  What operator performs pattern matching?
LIKE operator

Q  What operator tests column for the absence of data?
IS NULL operator

Q  Which command executes the contents of a specified file?
   START <filename> or @<filename>

Q  What is the parameter substitution symbol used with INSERT INTO command?
   &amp;

Q  Which command displays the SQL command in the SQL buffer, and then executes
it?.
   RUN

Q.  What are the wildcards used for pattern matching?
   _ for single character substitution
and % for multi-character substitution

Q  State true or false. EXISTS, SOME, ANY are operators in SQL.
   True

Q  State true or false. !=, &lt;&gt;, ^= all denote the same operation.
   True

Q. What are the privileges that can be granted on a table by a user to others?
  Insert, update, delete, select, references, index, execute, alter, all.

Q. What is the use of the DROP option in the ALTER TABLE comm&amp;?

It is used to drop constraints specified on the table.


Q. What is the value of ‘comm’ &amp; ‘sal’ after executing the following query if the initial

value of ‘sal’ is 10000?

UPDATE EMP SET SAL = SAL + 1000, COMM = SAL*0.1;

sal = 11000, comm = 1000 .

Q. Why does the following comm&amp; give a compilation error?

DROP TABLE &amp;TABLE_NAME;

Variable names should start with an alphabet. Here the table name starts with an '&amp;' symbol.


Q. What is the advantage of specifying WITH GRANT OPTION in the GRANT comm&amp; in sql?

The privilege receiver can further grant the privileges he/she has obtained from the owner to any other user.


Q. What is the use of DESC in SQL?

Answer :

DESC has two purposes. It is used to describe a schema as well as to retrieve rows from table in descending order.

Explanation :

The query SELECT * FROM EMP ORDER BY ENAME DESC will display the output sorted on ENAME in descending order.

Q. What is the use of CASCADE CONSTRAINTS?

When this clause is used with the DROP comm&amp;, a parent table can be dropped even when a child table exists. </filename></filename>

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