Databases Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

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Databases Interview Questions

Questions Answers Views Company eMail

1. Which is an aggregate function? a. Union b. like c. max d. Rank

Fintellix,

1 2955

2. Select A.A from ( select 1 as from dual Union select 1 as from dual)A Full outer join ( select 1 B from dual Union select 2 B from dual)B On A.A=B.B

Fintellix,

2 8596

3. Select sum(a) sum_1,max(a) max_1 ,count(a) count_1 from ( ( select 1 a from dual union all Select to_number(‘2011’) a from dual union all select 1 a from dual) union select 2 b from dual);

Fintellix,

1 3093

4. Select sum(A.salary) +sum(B.salary) as TOT_SAL from ( select LEVEL emp_id,level*100 salary,case when mod (level,2)=0then 2 else null end dept_id from dual connect by level<6 )A right outer join (select level emp_id ,level*200 salary ,case when mod (level,3)=0 then 2 else null end dept_id from dual connect by level<6)B On A.dept_id=B.dept_id And A.emp_id=B.emp-id;

Fintellix,

1 2654

7. Where would you look for errors from the database design?

Fintellix,

1 2956

Can any one explain me when i execute below query.. select months_between('07-JUL-12','10-FEB-12') from dual; Out put:- 4.90322581 How oracle calculate?

1349

HI Friends Myself Manoj,i am from bengaluru.i have 1 yr of exp in PLSQL but not upto the mark..now attending interviews but m not able to clear even 1 round..i have attended 3 interviews till today.purpose of writing this query is,i want to know the intreview topics that interviewer going to ask frequently,mainly SCENARIO based questions.IF anybody have any PLSQL projects please give it to me,it will helps me alot.Thanks for your patience.

1388

During insert operation in Netezza Connector, if we give direct option as Yes , is there any issue?

1348

I need a query to list out "Subinventory Transfer" record from Oct 2016 to Oct 2017 for few users

1177

Whis is not false in primary key?

Fintellix,

1420

Can we call a function that has out parameter in select statement

Nagarro,

1315

Call by value and call by reference in procedure and function, with NOCOPY.

Nagarro,

1258

If we delete pack Spec what will be the status of pack Body ?

Nagarro,

1447

Delete duplicate rows without using rowid.

Nagarro,

1504

What is Histogram?

NIIT,

1519

Un-Answered Questions { Databases }

What is sql server programming?

1005

Explain what is gridfs in mongodb?

how to handle exceptions in post production

1375

Why is it called mongodb?

How to bring a tablespace offline?

1012

What is cte?

936

How to drop an existing table?

974

How to pump the data from one database to another?

883

How to update a field in SQL after ALTERING a row?

1196

What are the different types of Indexes available in SQL Server?

966

What are the three levels of database architecture?

729

What are the main phases of database development?

931

How would you convert date into julian date format?

963

What is compilation error in pl sql?

939

How many triggers can be applied on a table?

897

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