Oracle PL_SQL Interview Questions

12/29/2014

Oracle PL/SQL interview questions

Oracle PL/SQL interview questions Oracle PLSQL interview questions and answers for freshers and experienced candidates. Also find Oracle PLSQL online practice tests to fight written tests and certification exams on Oracle PLSQL. In this section we have covered almost all Oracle PLSQL questions that might be asked during an interview.

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Oracle PL/SQL

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PL/SQL interview questions and answers - posted on April 22, 2013 at 02:10 PM

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Define PL/SQL.

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-PL/SQL is a procedural language and is an extension to standard SQL. -It enables us to execute procedural logic on the database. -We use PL/SQL to perform processing on the server. -We can also use PL/SQL to create stored procedure and functions.

Advantages of PL/SQL -PL/SQL is a development tool and is an extension to standard SQL. -We can use conditional checking, branching and looping in PL/SQL. -In PL/SQL, we can send a block of statement to the server which reduces network traffic. -PL/SQL provides rich set of error handling mechanism. -PL/SQL supports portability i.e. code written in DOS version can run on unix version.

Explain the concept of exception. An exception occurs when unwanted situation arises. The situation can be exceptional to normal functioning of the program. It can occur due to system error, user error and application error. In PL/SQL, we can anticipate and trap these errors by means of exception handling code. Types of Exceptions: Predefined oracle exceptions User-defined exceptions

Defined user defined exceptions. We use user defined exception only when oracle doesn't raise its own exception. In this procedure we raise an exception by using RAISE command.

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What is a cursor? Define explicit and implicit cursor.

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The oracle engine opens a work area for each SQL's operations for its internal processing in order to execute SQL statements. This area is private to SQL's operations and is called as a cursor.

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Implicit cursor - If the oracle engine has opened a cursor for its internal processing, then it is implicit cursor.

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Explicit cursor - It is also known as user defined cursor. When a user opens a cursor for processing data, the cursor is explicit cursor.

Oracle table privileges

Explain about the cursor attributes.

Oracle view privileges

Each cursor or cursor variable has four attributes:

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%FOUND, %ISOPEN, %NOTFOUND and %ROWCOUNT

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When appended to the cursor, these attributes return useful information about the execution of a data manipulation statement.

What are the restrictions of using cursor variables? -PL/SQL tables cannot store cursor variables. -Remote subprogram cannot return the value of a cursor variable.

What is a trigger in PLSQL? A trigger is a PLSQL block that is executed whenever an event occurs. It fires implicitly whenever the triggering event happens, a trigger never accepts argument. A trigger cannot be used for a SELECT statement.

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never accepts argument. A trigger cannot be used for a SELECT statement.

Oracle PL/SQL interview questions

What are the triggers supported in oracle?

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-DML triggers -Instead of triggers -DDL triggers -Database event triggers

Oracle application tuning

DML triggers

Oracle loops

It is defined on a table and fires in response to an event like

Oracle exceptions

Oracle procedures Oracle functions

- When a row is inserted to a table - When a row is updated - When a row is deleted

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Instead of trigger

Oracle date functions

This trigger is created on views. You can either use Insert or Update or Delete or all three actions.

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What are triggering attributes?

Oracle correlated sub-queries

Triggering attributes are used to catch event when you want to identify or to perform certain actions.

Oracle union, intersect, minus Oracle clusters

They are as follows:

Oracle sequences

Inserting Updating Deleting

Oracle tablespaces Oracle object datatypes

What is the difference between a function and a procedure in oracle?

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A function always returns a value back to the calling block.

What are packages? A package is an encapsulated collection of related schema objects. A package is compiled and then stored in the database's data dictionary as a schema objects. These objects can be procedure, functions, variables, constants, cursors and exceptions.

Explain the difference between GRANT and REVOKE command. GRANT command is used to allow a user to perform certain activities on the database. The REVOKE command disallows the user from performing certain activities.

Explain the difference between ROLLBACK and COMMIT commands. The COMMIT command is used to save the modifications done to the database values by the DML commands. ROLLBACK command is used to undo the changes made by the DML commands. This ensures the values that existed prior to the changes can be achieved.

Define Row level trigger. Row level trigger is fired each time a row is affected by DML statements like Insert, Update and Delete. When no rows affected, the trigger is not executed at all.

Define Statement level triggers. It is fired when statement affects rows in a table but the processing required is completely independent of the number of rows affected.

Define Joins and its types. A join is a query that extracts corresponding rows from two or more tables, views or snapshots. Types: Equi-joins Non-equi joins Self joins Outer joins

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Equi-join - information from two or more tables are retrieved by using equality conditions. Self joins - Self join is a join that relates to itself. Outer joins - Outer join fetch the rows from two tables which matches the join condition and the rows which don't match the join condition. Explain the advantages of PL/SQL. PL/SQL is a transaction processing language that offers the following advantages: ................ Read answ er

Explain block structure of PL/SQL.

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Oracle PL/SQL interview questions

DECLARE --------declarations BEGIN --------statements................. Read answ er

Write a PL/SQL program for a trigger. PL/SQL program for tracking operation on a emp table........... Read answ er

What are SQLCODE and SQLERRM and why are they important for PL/SQL developers? When a SQL statement raises an exception, Oracle captures the error codes by using the SQLCODE and SQLERRM globally-defined variables............... Read answer Explain difference between SQL and PL/SQL. Write a PL/SQL program for a function returning total tax collected from a particular place. What are the types PL/SQL code blocks? Anonymous Block, Stored Program Unit, Trigger........... Advantages of PL/SQL Support SQL data manipulation, provide facilities like conditional checking, branching and looping.............. The answers to following questions will be made available soon. Keep visiting. Define PL/SQL. Explain each section of PL/SQL with an example, i.e. Declaration, Executable commands, Exception handling. Explain the condition logic with an example, i.e. if, else, elsif and case command. What is Goto statement? Explain its uses with an example.

Write your comment - Share Knowledge and Experience Discussion Board java,oracle this is very useful for our future kanimozhi m 04-30-2013 10:50 AM

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