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?
Answer QuestionSelect Best Answer
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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Answer QuestionSelect Best Answer
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.
Answer QuestionSelect Best Answer
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?
Answer QuestionSelect Best Answer
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
Answer QuestionSelect Best Answer
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
What is the difference between
rownum,rowid
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Editorial / Best Answer
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?
Answer QuestionSelect Best Answer
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 ...
Oracle Basics Interview Questions
What is normalization? What is the
advantage of normalization?
Answer QuestionSelect Best Answer
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
What is the difference between
trigger and constraints ?
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Answer QuestionSelect Best Answer
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
Answer QuestionSelect Best Answer
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 ?
Answer QuestionSelect Best Answer
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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Answer QuestionSelect Best Answer
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.
Answer QuestionSelect Best Answer
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..?
Answer QuestionSelect Best Answer
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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Answer QuestionSelect Best Answer
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?
Answer QuestionSelect Best Answer
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 ..
Oracle Basics Interview Questions
What is the difference between
primary key, unique key, surrogate
key?
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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
Oracle Basics Interview Questions
What is the diffrence between and
constraints and triggers?
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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
Oracle Basics Interview Questions
BASECONV.CONVDATA
What is the function
BASECONV.CONVDATA(FILED_01,ARG_1,ARG_2) used for ?
Answer QuestionSelect Best Answer
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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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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8/19/2019 Oracle Basics Interview Questions _ GeekInterview
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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8/19/2019 Oracle Basics Interview Questions _ GeekInterview
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should I raise with the vendor about there
application...
Asked by: dba707
How do we insert blob datatype into table?
How to insert image in table?
Asked by: aravinthancse
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
Asked by: prasant0661
Exceptions
What do yo mean by exceptions? How many type of
predefined exceptions are there & What are they?
Asked by: samarendra161
Oracle inventory
Where is Oracle Inventory located in Oracle 10g and
11i ?
Asked by: rahuldoulagar
Change lov dynamically
What is POST in D2K.How can you change the LOV
Dynamically?
Asked by: kreddy.vonteddu
Db writers
How many database writers are available (max) to
create in Oracle.
Asked by: happy
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?
Asked by: sure_prince
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