CREATE procedure dbo.select_a
@b varchar(50),
@c varchar(50),
@d varchar(50),
@e varchar(50)
as
declare @strsql varchar(5000) ;
set @strsql="select * from a where 1=1 ";
if @b <>""
set @strsql= @strsql+" and b=""+@b +""";
if @c <>""
set @strsql= @strsql+" and c=""+@c +""";
if @d <>""
set @strsql= @strsql+" and d=""+@d +""";
if @e <>""
set @strsql= @strsql+" and e=""+@e +""";
exec (@strsql)
GO