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

Oracle (3253)
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DB Architecture (141)
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DB Development (113)
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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,

2011

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

4 5679

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 4183

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

Spectra,

2 4447

difference between function and procedure

Cognizant, HCL, TCS, Theorem,

3 5515

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,

1592

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,

1796

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 8132

How to fetch records from a partitioned table?

HSBC,

2 8194

How many triggers can be implemented for a table?

HSBC,

3 7209

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 4632

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 7690

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

HSBC,

5 13912

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 5068

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 3218

Un-Answered Questions { Databases }

What are five main functions of a database administrator?

913

List out some features of neo4j database?

What is a trigger word?

1081

When should I execute an sp_recompile in sybase?

950

What are the benefits of oracle rac?

What is pl sql collection?

1017

What is SQL Server?

1276

what's the difference between delete table and truncate table commands? : Sql server database administration

1041

Explain the index key?

840

What is ceil and floor in oracle?

1124

Can we use pl sql in mysql?

1063

When cursors are useful?

1172

What is load plan and types of load plans in ODI?

673

What is a tns file?

1048

What is cardinality in db?

1077

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