how to find the value in sql server

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hello,

I have a table e.g. student like this:-

roll    mark
--------------
1       50
2       60
3       70
--------------

when I making query

SQL

select mark from student where roll=1

It is showing

mark
-----
50

but when I am writing

SQL

select mark from student where roll=4

It is showing

mark
-----

But I want if the condition is not satisfied then it return zero means like:-

mark
----
0

Thanks.

Posted 2-Feb-12 22:12pm

JBSAHU

Updated 3-Feb-12 18:25pm

Amir Mahfoozi

v3

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OriginalGriff · Accepted Answer · 2012-02-02T22:23:00

Solution 1

That is not a nice thing to do - it means you cannot tell the difference between a student that doesn't exist, and a student that scores zero. However:

SQL

IF EXISTS (SELECT mark FROM student WHERE roll=4)
SELECT mark FROM student WHERE roll=4
ELSE
SELECT 0

But you should find a better way to organise your code instead. If nothing else, this is very inefficient!

Posted 2-Feb-12 22:23pm

OriginalGriff

Comments

^That's Aragon 3-Feb-12 7:38am

Agreed with OriginalGriff. 5!. Application should have some differentiation mechanism for students who have mark 0 and whose record is not available in table like here for roll=4 is not available then it should return mark=-1 Later on, you can display proper message for mark=-1 and mark=0 records.

amesh004 · Accepted Answer · 2012-02-02T22:24:00

Solution 2

SQL

select isnull((select mark  from @temptable where id=4),0) as mark

This query is based on SQL 2008 Data Base.@temptable is table name.

Posted 2-Feb-12 22:24pm

amesh004

Updated 3-Feb-12 10:53am

v3

Comments

Rajeev Jayaram 3-Feb-12 6:34am

5!