sql server - Add column to condition based on parameter value SQL -

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i'm working in dynamic query need add column query if parameter value false.

//sql:

set @filterexp = 'select * tblname ptblnflag = '+convert(varchar(2),@blnflag)+') tbl 1=1'+ coalesce(nullif( convert(varchar(8000), @filterexp),''), '')

in above query need check if @blnflag false column can added in condition. if true need not there.

something if condition false should return values , if true result set based on condition.

you need and/or operator's no need of dynamic query here 

select *   tblname  ( ptblnflag = @blnflag          , @blnflag = 0 )         or @blnflag = 1

may wrong variable names logic same


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