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Q:

How can you generate debugging output from PL/SQL?

Answer

Use the DBMS_OUTPUT package. Another possible method is to use the SHOW ERROR command.

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Q:

How can you find a PL/SQL block, if the cursor is open?

Answer

By use of %ISOPEN status variable.


 

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Q:

What are PL/SQL cursor exceptions?

Answer

Cursor_Already_Open,  Invalid_Cursor.

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Q:

Describe the use of PL/SQL table?

Answer

PL/SQL tables are scalar arrays that can be referenced by a binary digit. They can be used to store values for later queries and calculations.

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Q:

What type of Joins have you used?

Answer

The knowledge of Joins is a MUST for every interviewee. Most SQL programmers have used inner join and  outer join[left/right]; but the catch point here is to also mention cross join and self-join.


 

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Q:

What is the difference between JOIN and UNION?

Answer

SQL JOIN allows access to records of other table based on the given conditions between two tables.


Ex: If we are provided with the department ID of each employee, then we can use the department ID of the employee table to merge with the department ID of the department table to access department names.


UNION operation allows addition of 2 similar data sets to create a resulting set that contains all the data from the source data sets.


Ex: If we are provided with 2 employee tables of the same structure, we can UNION them to create a singular result that will contain all employee from both the table.

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Q:

Write SQL Query to display current date?

Answer

The built in function called GetDate() returns the time stamp.

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Q:

Difference between a query and a statement in SQL?

Answer

An SQL statement is a string of characters that conforms to the syntax and format specified in the international standard.


A query is a statement that returns a record-set.

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Subject: SQL