Please help to build an sql from the given expression to build case condition with Where clause

if @rollno is not null then
Select top 1 studentid from student where rollno =:@rollno
else
if @regno is not null then
Select top 1 studentid from student where regno =:@regno
Please help me to create the above condition as a single sql statement . I will pass two argument in to the sql.
With Thanks
Pol
polachan

Select top 1 studentid from student
where (rollno =:@rollno or :@rollno is null)
and (regno =:@regno or :@regno is null)
The above expression will work in SQL server
I'm not sure you're using sql server as syntax like :@regno are not t-sql valid
so you can try the above and if it doesnt work please try in the relevant forums for more help in case you're using a different RDBMS
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Med venlig hilsen
Mogens Pedersen
Specialkonsulent
T 33 63 13 07
F 33 63 10 11
[email protected]<mailto:[email protected]>
Fra: Bernd Alheit [email protected]
Sendt: 2. marts 2012 13:11
Til: Mogens Pedersen
Emne: Help Please - having difficulties creating af link from the text to an attached file i acrobat
Re: Help Please - having difficulties creating af link from the text to an attached file i acrobat
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Please help to build an sql from the given expression to build case condition with Where clause

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