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

Oracle (3259)
SQL Server (4518)
MS Access (429)
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Postgre (483)
Sybase (267)
DB Architecture (141)
DB Administration (291)

DB Development (113)
SQL PLSQL (3330)
MongoDB (502)
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Database Management (1411)
Databases AllOther (288)

Databases Interview Questions

Questions Answers Views Company eMail

how to i write the query 'NISHI' TO N I S H I

Attra, Metric Stream,

4 7232

Hi Guys, I have a situation where I need to access the column values from rowtype variable. However, the column names are dynamic. below is sample code: declare Cursor c1 is select * from emp; Cursor c2 is select column_name from xyztable; v_c2 c2%rowtype; v_str varchar2 v_value varchar2(200); begin for rec in c1 loop open c2;---this cursor has column names like EMPLOYEE_ID, FIRST_NAME, LAST_NAME etc. loop fetch c2 into v_c2; exit when c2%notfound; /* now lets say i want to access value of LAST_NAME from cursor c1, so I am writing below code, however it does not work as expected */ v_str:= 'rec.'|| v_c2.column_name; -- this will give me string like "rec.EMPLOYEE_ID" v_value:=v_str; end loop; end loop; end; / Plz help ASAP.Thanks.

2 3515

The table has 3 columns 4 rows. The output is which column has least null values( A COL SHOULD BE THE OUTPUT) Write the query plz. A B C ---------- 1 NULL 7 2 4 NULL NULL 5 NULL 3 NULL NULL

TCS,

1 3311

The table has 3 columns 4 rows. The output is which column has least null values( A COL SHOULD BE THE OUTPUT) Write the query plz. A B C ================ 1 NULL 2 NULL 3 4 NULL 5 6 7 NULL NULL O/P C = 2 4 6

TCS,

2 3947

difference between SQL and C

Indus Software Technologies,

1 3429

Why fastload support to empty table?

CTS,

1644

Teradata: How can we know the indexed column in a table?

CTS, HSBC,

1862

how to overcome kernel isssues

Fortune,

1583

how to restore particular schema from rman full backup?

HCL,

1720

user says the db performance is slow or yesterday the query runned 1min and today its taking 30 min. how to trouble shot or were to start with?

HCL,

1 3031

what is logical system in sap basis

1597

how to solve cardinality in dbms...many to many ralationships

1658

HI Friends I m new dev(forms & report). can anyone tell me how we upload a document on form 11g.??

Access Info,

1427

how to write a query without using where? Example- select * from employee where empno=10 I need to write this query without where clause.

Alshaya,

1 3218

How to display all Friday's in a year with date?

Flipkart,

4 7499

Un-Answered Questions { Databases }

Explain what is mongodb?

Explain the truncate command? : SQL Server Architecture

1112

What are the functions in sql server?

919

Explain features and concepts of analysis services?

947

how can we submit a form without a submit button? : Sql dba

935

Explain tables in SQL Azure?

120

What are the lock types?

902

What is oracle and what are its different editions?

1034

How would you check the long running transaction?

872

What is the benefit of database?

860

Explain the use of containers in ssis?

906

What are the difference between primary keys and foreign keys?

929

What are the parts of a table?

935

Do we need to create index on primary key?

878

How many indexes can be created on a table in sql?

1008

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