using conditional where in stored procedure of sql server 2000

Question

I am trying to use a condition in stored procedure which is created by using multiple tables. Can anybody please help me to solve this problem?

I want to skip a parameter if the parameter value is null or nil .

Example: I want to see all the cities of a country starting with 'A' if user select a country name from drop down list and want to see all the cities starting with 'A' of all countries if user does not select any country.

Please suggest me what will be placed in the following line:-

WHERE substring(cityname,1,1)='A' and countryname=@countryname

Eagerly awaiting suggestion from anybody.

Thanks, Nowshad

Answer 1

I want to skip a parameter if the parameter value is null

Simply check to see whether your parameters are NULL or whether they specify a predicate. If they specify a predicate, then check that it matches.

    SUBSTRING(CityName, 1, 1) = 'A'
AND ( @CountryName IS NULL OR CountryName = @CountryName )