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

What does “select count(*) from tab” result?

IBM, Student, Wipro,

15 29616

What does “select count(1) from tab” result?

IBM,

10 21453

suppose we have a table in which 200 rows. i want to find 101 row ? what the query.... and how we find 4th and 5th highest salary and 1 to 10 highest salary

7 12981

I have 2 Databases. How can create a table in particular database? How can i know the list of tables presented each database?( in oracle 10g)

Relq,

5 9808

What is the default value of CHAR type?

Bosch,

3 10205

If CPU is very slow What can u do to speed up?

1 4655

if monday take full backup and tuesday it was cumulative backup and wednesday we taken incremental backup, thursday some disaster happen then what type of recovery and how it will take?

1 4094

when we login sql editor using username and password then it says this error "could not resolve service name" then what can we do at client side.( here thing is tnsnames.ora file is ok till yesterday and worked well, but now it giving error.

1 1803

There are n numbers of flatfile of exactly same format are placed in a folder.Can we load these flatfile's data one by one to a single relational table by a single session??

1 2092

how many tupples can insert in 1 second in sql

1 5754

i have marks in table,how to find total?

1 5408

what is difference between nchar and char in Sql server ?

3 8366

How can we write or define DDL statements in Sql server and DML statements?

3 6623

How many memory layers are in the shared pool?

3 7887

How do you find out from the RMAN catalog if a particular archive log has been backed-up?

IBM,

2 11477

Un-Answered Questions { Databases }

in user parameter property we have list of values.can we write select query for binding? for example:: select empno from emp where deptno=:deptnum :deptnum is first parameter it displays distinct dept nos. if i do like this it is giving error:: bind variables are not allowed in the select statement

2202

Can delete statement be rollbacked?

1038

Is inner join faster than left join?

1265

how to escape special characters in sql statements? : Sql dba

1097

What is sql server query analyzer?

1112

What are wait types?

1220

Does view occupy space?

1000

what is collation? : Sql dba

1211

what is the Ticketing tool used in Wipro technologies at Bangalore...???

8210

What is an indexed view?

1013

do you know how to configure db2 side of the application? : Sql server database administration

1106

This question asked during interview, 2) At the end of each month, a new table is created for each bank that contains monthly metrics consolidated at the account level. The table naming convention is bankX_YYYYMM where X represents the numeric designation of the bank and YYYYMM indicates the 4 digit year and 2 digit month. The tables contain the following fields: name data type description account text account number registered boolean indicates whether the account is registered num_trans integer number of transactions made during the time period spend numeric(9,2) total spend during the time period a) Write a SQL query that will display the total number of transactions and total spend for "Bank1" during the 4th quarter of 2009. b) Write a SQL query that will display the total number of transactions and total spend at "Bank1" and "Bank2", broken out by registered vs. non-registered accounts, during January 2010 not sure what is correct answer and how to solve?

2545

Can we rollback truncate?

1059

What is temporary table in sql server? Why we use temp table?

1001

Why we use the openxml clause?

1059

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