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

Oracle (3259)
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Sybase (267)
DB Architecture (141)
DB Administration (291)

DB Development (113)
SQL PLSQL (3330)
MongoDB (502)
IBM Informix (50)

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Apache CouchDB (44)
Firebird (5)

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 7368

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 3594

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 3360

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 4040

difference between SQL and C

Indus Software Technologies,

1 3503

Why fastload support to empty table?

CTS,

1692

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

CTS, HSBC,

1893

how to overcome kernel isssues

Fortune,

1625

how to restore particular schema from rman full backup?

HCL,

1754

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 3095

what is logical system in sap basis

1641

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

1703

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

Access Info,

1450

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 3288

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

Flipkart,

4 7609

Un-Answered Questions { Databases }

What is the contrast between sql and mysql?

1110

Explain for what purpose you can use neo4j databases?

Explain issues for database performance.

950

Explain how can you use the same lov for 2 columns?

1128

What is the purpose of normalization in dbms?

1161

Describe the types of keys?

1108

what does the t-sql command ident_current does? : Transact sql

977

Why are recursive relationships are bad? How do you resolve them?

1159

What is rank function in sql?

1026

Are foreign key constraints necessary?

836

What is trigger explain with program?

980

What are the different types of (all page) locks in sybase?

816

Explain error and transaction handling in sql server?

1012

What is difference between mongodb and dynamodb?

What is spool?

1054

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