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

i have a question here... As of my knowledge, when we apply an index (b-tree)on a column, internally it arranges the data in b-tree format and do the fetching process correspondingly... and my quetion is... How a bit-map index arranges the data internally when applied on a column?IS it in b-tree format or whatelse?

Oracle,

1949

which institute and which faculty is providing best training for oracle sql, plsql in hyderabad

4 5519

I have a table emp , Fields with empname,dnname,dno,salary. now I want copy distinct salary with all emp detail from emp into new table which is not already exist in database. how would I do this ?

Techno Labs,

2 4070

how to copy only distinct data into another table which is not already exist in database?

Spectra,

2 4318

difference between function and procedure

Cognizant, HCL, TCS, Theorem,

3 5373

I have single column in a file. Input 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15 my output is file 1 have 1,2,3,10,11,12 file 2 have 4,5,6,13,14,15 and file 3 have 7,8,9 how is it possible in datastage

IBM,

1553

First input columns brand, mt, re values are ov, 1,re vg, 2,re wu ,3,re. Second input columns are brand, mt, cx their records are ov,4,vg ,5,cx Wu, 6,cx and third input columns brand, mt, rt values are ov,7,rt vg, 8,rt wu, 9,rt but my output is brand, re, cx,rt values are ov, 1,4,7 vg, 2,5,8 wu, 3,6,9

IBM,

1740

While inserting/updating million of records into a database table, how do I came to know how many records has been inserted or updated successfully so far?

HSBC,

2 8029

How to fetch records from a partitioned table?

HSBC,

2 8105

How many triggers can be implemented for a table?

HSBC,

3 7068

My select statement is not working as expected, So, to overcome from such issues what are the steps needed to be taken care?

CG,

2 4510

I have a table with 1 million records out of which 10,000 records are of unique records, then if I will implement index, then which type of index shall I use and why shall I use?

HSBC,

2 7572

Can we use commit or rollback in trigger? If yes, then how. Please explain with a suitable example?

HSBC,

5 13680

2) Consider a Table name A which has below records ID --- 5 5 5 5 5 Consider another table B which has below records ID -- 5 5 5 5 5 5 5 5 How many rows will be returned by each of the below queries a) select * from A inner join B on A.id = b.ID b) select * from A left join B on A.id = b.ID c) select * from A right join B on A.id = b.ID

Synechron, TCS,

2 4952

I have 3+ Years experience HR with Technical Recruitment Industry. Now i would like to learn oracle HRMS Models of all aspect. please suggest any one, which institution is best for oracle HRMS practical with real time teaching in Chennai, Tamilnadu. What are the basic stat up to learn Oracle HRMS with Core strongly?

Oracle,

1 3140

Un-Answered Questions { Databases }

Is mongodb easy to learn?

What are date and time intervals?

989

Is it necessary to install mongodb compass?

What does desc stand for?

1069

what are the 'mysql' command line arguments? : Sql dba

1138

What is percent sign in sql?

1283

What is mysql database server?

965

what is tripstop report?

1835

Explain what is mysql?

1038

What's dateware house and what's clustor with practicle example

2175

How do you add a serial number to an access report?

812

What is the difference between clustered and non-clustered indexes?

1092

What do you understand by intension and extension?

920

Explain why variables called the most powerful component of ssis?

1097

How do I create a stored procedure in mysql?

900

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