Oracle Basics Interview Questions _ GeekInterview

8/19/2019 Oracle Basics Interview Questions _ GeekInterview

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GeekAdmin Oracle Basics Interview Questions

What is the difference between

entity and attribute?

To put the definition of an entity is an entity is a single

person, place, or thing about which data can be stored.

That is in other words for example when one wants to

store information about STUDENT then it has details like

studentno, student name, address for communication,phone number, class of the student and so on. All of these

details together is placed in the entity or table called as

STUDENT....

Answer QuestionSelect Best Answer

rishabh

Jan 29th, 2016

Attributes are the properties of entity, i.e, Everyentity has some attributes.

magedabd

Apr 10th, 2010

The question is: " is the attribute instance." Theattribute itself is not an instance but the value"Exforsys" stored in the attribute is an instance.

samarendra161 Oracle Basics Interview Questions

SQL Commands to Manipulate

Oracle Database Structures

Which is the subset of SQL commands used to manipulate

Oracle database structures, including tables?


test

Jan 5th, 2016

DDL is used to define database structure (cerate ,alter, drop, truncate)DML is used to manipulate data ( select, insert,update, delete)So DDL is used to manipulate database

sri ram reddy

Nov 14th, 2015

Alter command manipulates Oracle databasestructures including tables

sreenu Oracle Basics Interview Questions

Object and Relational View

Explain the difference between object view and relational

view.

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Oracle Basics Interview Questions

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Diptiman

Dec 21st, 2015

A "Relational View" is the projection of the datausing simple relational tables like: CREATE ORREPLACE VIEW relational_view (employee_name,department_name) AS SELECT employee_name,department_na...

adarsh_sp Oracle Basics Interview Questions

Create a query that will display thetotal no.of employees and, of that

total, the no.of employees hired in

1995,1996,1997, and 1998. create

appropriate column headings.


RAVI

Dec 8th, 2015

Code

1. SELECT TO_CHAR(HIREDATE,YYYY),COUNT(*) FROM EMP GROUP BY TO_CHAR(HIREDATE,YYYY) HAVING TO_CH

YaserAbbasi

Sep 25th, 2015

Late by couple of years but here you go"oracle8SELECT COUNT(*) as "Total" ,SUM(CASETO_CHAR(HIRE_DATE,YYYY) WHEN 1995 THEN 1ELSE 0 END) as "1995", SUM(CASETO_CHAR(HIRE_DATE,YYY...

nareshgupta12 Oracle Basics Interview Questions

Truncate command in oracle is DDL

command or DML command ? give

the answer with descirptive reasonwhich is and why?


SRI RAM REDDY

Nov 14th, 2015

Truncate is DDL command, not a DML commandWhen we issue Truncate on a database table, therecords are deleted from the table, and structureremains same. Once we issue truncate on a table,the record...

Akshatha

Dec 25th, 2014

Truncate is DDL. Auto commits the transaction.Also, truncating a table can reset the high watermark if REUSE storage clause is not used.

ravikumar.drk Oracle Basics Interview Questions

GROUP BY Performance

Which one will give best performance between GROUP BY

function in Oracle and GROUP BY function in Crystal

Reports? Explain


ShyamOct 22nd, 2015

The Group BY in Oracle will give best performance,because Group By is not a function for Oracle.

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senthil Oracle Basics Interview Questions


rownum,rowid

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rishipahuja

Member Since Aug-2006 | Aug 6th, 2006

rowid has a physical significance i.e you can reada row if you know rowid. It is complete physicaladdress of a row.While rownum is temporary serial numberallocated to each returned row during queryexecution.

vinay

Sep 20th, 2015

It it will be re-assigned to a different row wheninserted by Oracle.

Arif

Jul 3rd, 2015

I have one doubt like you said that rowid isautomatically created when we add a row(record)then what happens to rowidwhen we delete that record?

satish Oracle Basics Interview Questions

What is difference between COM &

DCOM?


Balaji

Aug 5th, 2015

The way for accessing a remote object.

maqk

Jan 2nd, 2006

What's the Difference between COM and DCOM?Obviously, the difference is that DCOM isdistributed but COM is not. To be more precise,there are three main elements added to COM: Theway for creating a ...


What is normalization? What is the

advantage of normalization?


Subrat

Jul 28th, 2015

It is a Process to obtain a database design thatallows for efficient access and storage of data. Thisprocess use reduce data redundancy and thechances of data becoming inconsistent.

rama

May 11th, 2015

Normalization is the process of dividing the datainto separate tables because of dividing data intotables avoiding the data redundancy(duplications)

narasingha baral Oracle Basics Interview Questions


trigger and constraints ?

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4/12


munny

Jul 24th, 2015

Triggers are the stored procedures that are firedwhen an DB event occur where as Constraints arethe checks or the rules that are enforced on datacolumns to maintain the data integrity. Both canbe...

Samudrala

Jan 30th, 2015

Constraints are the rules enforced on datacolumns on table. These are used to limit the typeof data that can go into a table. This ensures theaccuracy and reliability of the data in the database.

C...

parthokonar1 Oracle Basics Interview Questions

Can any one tell me how the get the

datafile when my controlfile is lost

and i have created a new controlfile.

and the information about the

datafile is present in the previous

controlfile which is corrupt and

deleted. and there is no backup of the datafile is present


SATHEES KUMAR

Jul 1st, 2015

Control file is a small binary file that record thephysical structure of the database like datafile andredolog file location, timestamp,scn and used forrecover purpose all so but have no datafile backupthen you cant recover the database.

Rushil

Sep 17th, 2014

Hi, Can anyone explain what is data file andcontrol file.

Sundra Oracle Basics Interview Questions

Can you explain what is DUAL table

in oracle ?


shadiq

Jun 25th, 2015

Insert into dual values (Y); will work i guess, onlything is you need a sufficient privilege...Also Dual can have 1000 columns and only onerow.

subrahmanyam pattapu

Jul 19th, 2011

Dual is default table in oracle .it contains singlerow and single column.All the Character functionsand number functions and date functionsexecution done in this Dual table.

uma Oracle Basics Interview Questions

Finding errors from Pl/SQL package

How to check errors from plsql package not by log file not

by "show err"from sql * plus provided concurrent program

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5/12


prakash

Jun 8th, 2015

Using dbms_utility.format_error_mask function willbe used to get errors from that package.

Karthik Sai

Feb 2nd, 2015

Using exception / dbms output are the best andeasier methods

Rohit Mathur Oracle Basics Interview Questions

What steps server process has to

take to execute an update

statement.


anjum

May 1st, 2015

When update statement fires data will be loadedinto buffer from data files and keeps the old imageinto undo tablespace and modifies the data inbuffer once you commit modified data will bewritten to data files if you rollback data fromundotablespace it will read and writes to the datafiles.

premk

Dec 23rd, 2009

When a user issues a update statement the serverprocess checks for weather the same type of command is executed recently or not if thatcommand is executed very recently then it directlyproceed to t...

shankar Oracle Basics Interview Questions

Difference between IS and AS in

oracle

What is the difference between IS and AS in Oracle

PL/SQL..?


Nupur

Apr 24th, 2015

In plsql there is no difference.

pabitra praharaj

Mar 26th, 2015

IS is used in to filter which value is null or not null.

AS is used in for ALIAS

abhimanu.singh Oracle Basics Interview Questions

What is the difference between ALL

and ANY in ORACLE?can any one

explain with example?

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Samudrala

Jan 30th, 2015

ANY The ANY comparison condition is used tocompare a value to a list or subquery. It must bepreceded by =, !=, >, ANY (2000, 3000, 4000);EMPNO SAL ---------- ---------- 7...

Samudrala

Jan 30th, 2015

ALL The ALL comparison condition is used tocompare a value to a list or subquery. It must bepreceded by =, !=, >, ALL (2000, 3000, 4000);EMPNO SAL ---------- ---------- 783...

Beena Oracle Basics Interview Questions

In Oracle varchar2 takes dynamic

space for storage then why char is

still in oracle?


Vijay Shewale

Sep 11th, 2014

The reason behind char is still in oracle that issome of the table and objects are stored in oraclein char data types. to support that data types forthat it is still in oracle. one more thing that ...

Paras

Feb 23rd, 2013

To Provide backward compatibility. i.e. programwritten in older version of Oracle might have CHARused in it. The newer version should becompatible with it. Thats why CHAR is still there inOracle ..



primary key, unique key, surrogate

key?

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7/12

Improve Answer

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Editorial / Best Answer

Kolta Sam

Member Since Jul-2011 | Jul 10th, 2011

Primary Key:It is a visible keyIt generated by user or application.It could be changed by the user or application.It could be queriedIt used to form a relation between tablesIt shouldn’t contain null valueIt resemble table rowIt is a unique identifier for a table object.

It contains only one keyIt could contain numeric and strings characters.It is an unique key which each row contain adistinct different key.Example for it is a customer_Id.It always starts by number one and second is twoand so on but can starts with a different number.Could created on one or more columnsNo duplicate recordsSecondary Key:It used to form a relation between tables.It is alternate table key.It used to search data with primary keyIt could contains null valueIt could contains more than one secondary keyfor each tableCreated only on one columnsNo duplicate recordsIt creates index clustered by default

Surrogate Key:It is invisible key for the user or the application.It resembles database entity.It generated by the system so it is invisible foruser and application.It shouldn’t contain null valuesOnly one surrogate key for each data entityIts value is unique system wide.Its value is never manipulated by the user or theapplication.It never reusedIt is frequently sequential numberIt called synthetic key, an entity identifier, a

system-generated key, a database sequencenumber, a factless key, a technical key, or anarbitrary unique identifierNo duplicate records

gagandeepp

Aug 21st, 2014

Null values can be used more than one times inthe unique key column .....because null is not equalto null or null is not equal to zero or null is notequal to space..............

Kote

Mar 26th, 2014

Primary key does not accept any null value butunique key accepts null value for each row of

Unique columns. Kote


What is the diffrence between and

constraints and triggers?

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092005

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8/12


rc

Aug 15th, 2014

CONSTRAINTS:= 1.it will check the existing dataand feature data. 2.we cant change the constraintbehavior these are predefined. 3.constraint arenot support the object tables. 4.constraints cancrea...

vishnuvardhanarao

Nov 14th, 2012

Check constraints it cant work multiple tables

Satish_Chaudhary_2113


BASECONV.CONVDATA

What is the function

BASECONV.CONVDATA(FILED_01,ARG_1,ARG_2) used for ?


nagarjuna

May 2nd, 2014

Baseconv.convdata is the conversion of someencrypted data to numeric data. the conversionvalues depends on the arguments u are passingfor the function

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9/12

What is the sequence of events fired when a page is

saved.

Asked by: gnana

If the digits of my present age are reversed then I

get the age of my son.If 1 year ago my age was

twice as that of my son.Find my present age

Asked by: sujatha

What is difference between unique and primary key

constraints?

A table can have only one PRIMARY KEY whereas there

can be any number of UNIQUE keys. The columns that

compose PK are automatically define NOT NULL,

whereas...

Asked by: Interview Candidate

What is the command to find out the nfs version in

solaris?

Asked by: lakshmananit

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10/12

Adding new application at existing Oracle

11gr2 database.

I have a request about adding new application at

existing oracle 11gr2 database. What questions

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11/12

should I raise with the vendor about there

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Asked by: dba707

How do we insert blob datatype into table?

How to insert image in table?

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Oracle doc command

What is the meaning of 'doc' command in oracle ?

What are the use of it?

Asked by: hiteshvaghasiya1990

Massallocation jouranl entryHow to "reverse" a MassAllocation Journal Entry in

Oracle?

Asked by: 1849VOGTE

Compare duplicate tables

How to avoid Cartesian product comparing duplicate

tables in SQL?

Asked by: bambina_b

Passing record group from form to report in

d2k

How to run same report with different query

through parameter

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Exceptions

What do yo mean by exceptions? How many type of

predefined exceptions are there & What are they?

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Oracle inventory

Where is Oracle Inventory located in Oracle 10g and

11i ?

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Change lov dynamically

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Dynamically?

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Db writers

How many database writers are available (max) to

create in Oracle.

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Oracle DBA upgrade concepts

What is utlu211i.sql in Oracle DBA in upgradeconcepts? Any one explain in detail

Asked by: kalyan

Oracle Apps attribute and GLobal attribute

What is the difference between Attribute and Global

Attribute in Oracle Apps

Asked by: Bharat Bhatia

Oracle 11g architecture

What is the difference in Oracle 10g and 11g

Architecture

Asked by: MOHIT NARANG

Display the rank in asending & descending

order for salary column

Can anybody solve this interview question in

DataStage? My input is: EMPNO, DEPTNO, SALARY 1

A 100 2 A 4000 3...

Asked by: sai3689

Reverse duplicate

How to delete reverse duplicate in oracle. e.g i/p col1

Mutual table

What is the Mutual Table?

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Oracle Basics Interview Questions _ GeekInterview

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