How to use If Statement in Where Clause in SQL?

Question

I need to use if statement inside where clause in sql.

Select * from Customer
WHERE  (I.IsClose=@ISClose OR @ISClose is NULL)  
AND    
(C.FirstName like \'%         


        

Answer 1

select * from xyz where (1=(CASE WHEN @AnnualFeeType = 'All' THEN 1 ELSE 0 END) OR AnnualFeeType = @AnnualFeeType)