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Top 101+ Oracle Interview Questions and Answers

Top 101+ Oracle Interview Questions and Answers

Here are the list of most frequently asked Oracle Interview Questions and Answers in technical interviews. These questions and answers are suitable for both freshers and experienced professionals at any level. The questions are for intermediate to somewhat advanced Oracle® professionals, but even if you are just a beginner or fresher you should be able to understand the answers and explanations here we give.

What are Schema Objects?

What is a Table?

What is a View?

What is an Index?

What is a Data file?

What is the difference between UNIQUE or PRIMARY KEY Constraint?

What is PL/SQL ?

What is the basic structure of PL/SQL ?

What is the difference between %ROWTYPE and TYPE RECORD ?

What is a cursor ? Why cursor is required ?

Explain the two types of cursors ?

What is Raise_application_error ?

What is the difference between a PROCEDURE and FUNCTION ?

What is Overloading of procedures ?

What is a package ? What are the advantages of package ?

What is difference between TRUNCATE and DELETE?

What is a join? Explain the different types of joins?

What is a Subquery?

What is correlated sub-query?

Difference between SUBSTR and INSTR?


What are the Usages of SAVEPOINTS?

What is ROWID?



What is difference between CHAR and VARCHAR2? What is maximum SIZE allowed for each type?

How to store the results of a query into a file?

Which two statements about subqueries are true? (Choose two.)

Which three functions can be used to manipulate character, number, or date column values? (Choose three.)

Which statement about a table is true?

What will be returned from SIGN(ABS(NVL(-32,0)))?

Which functions could you use to strip leading characters from a character string. Select two.

All the operators are used in single row subquery except one

All the commands executes in iSQLplus except one

Ascript file which will be executed automatically in iSQLPlus is

A command in iSQL plus is used to give the status of old and new value of variable

All commands are used to save the changes of the transaction except one

A Clause which is used in joining two tables other than equality operator is

A Clause which is the pseudocolumn used to know the current value of the sequence

A Query which is used in top-N analysis is

An operator is used to get and display the redundant records

All the datatypes with respect to Oracle 9i is true except one

What is database?

To select records from the given row?

To check the leap year

To delete duplicate records

To keep latest single record

To select second max salary

To select nth max salary

To select nth min salary

To select top(n) max salaries

To select top(n) min salaries

To select records from particular row(the remaining rows)

to select first n rows

Explain the difference between trigger and stored procedure.

Differences between DATE and TIMESTAMP in Oracle

Create a copy of EMP table without any data?

Delete the 10th record of EMP table?

Find all the departments which have more than 3 employees?

Display the manager who is having maximum number of employees working under him?

Display the name of employees who joined on the same date?

Delete those employees who joined the company 10 years back from today?

Display those employees whose salary is ODD value?

Find out the number of employees whose salary is greater than their manager salary?

Select the count of employees in each dept where count is greater than 3?

Display name of those employees who are getting the highest salary?

What is a transaction ?

What is implicit cursor and how is it used by Oracle ?

Which of the following is not a schema object : Indexes, tables, public synonyms, triggers and packages ?

Is there a PL/SQL Engine in SQL*Plus?

Can one read/write files from PL/SQL?

How can I protect my PL/SQL source code?

Can one use dynamic SQL within PL/SQL? OR Can you use a DDL in a procedure ? How ?

What are the various types of parameter modes in a procedure ?

What are the constructs of a procedure, function or a package ?

Why Create or Replace and not Drop and recreate procedures ?

Can you pass parameters in packages ? How ?

What are the parts of a database trigger ?

What are the various types of database triggers ?

What is the advantage of a stored procedure over a database trigger ?

What are cascading triggers? What is the maximum no of cascading triggers at a time?

What are mutating triggers ?

What are constraining triggers ?

Describe Oracle database's physical and logical structure ?

Can you increase the size of a tablespace ? How ?

What is the use of Control files ?

What is the use of Data Dictionary ?

What are the states of a rollback segment ? What is the difference between partly available and needs recovery ?

What is the maximum no.of columns a table can have ?

Can you pass a parameter to a cursor ?

What are the various types of RollBack Segments ?

What are the disadvantages of SQL ?

When to create indexes ?

How can you avoid indexes ?

What is the difference between a view and a synonym ?

What is the difference between foreign key and reference key ?

What is a package cursor ?

What are snap shots and views

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