multiple parameter in crystal reports(CAse in SQL)

Hi All,

I am using add command in crystal report

and

Query is

select a.text_value, s.user_sampleid,ns.study  from naiv_sample_attributes a inner join nai_samples s

on s.sample_id=a.sample_id

inner join nai_results r on s.sample_id=r.sample_id

inner join nai_submissions ns on

ns.submission_id=s.submission_id     

where a.name='Date Received'

and

  to_date(a.text_value,'DD-MON-yyyy HH24:mi:ss') between

  to_date('01-APR-2013 08:53:22','DD-MON-yyyy HH24:mi:ss')

and to_date('30-APR-2013 08:53:25','DD-MON-yyyy HH24:mi:ss')

and r.Status in {&Status}

now Status parameter contains 3 values 'COMPLETE' , 'SUSPECT' and COMPLETE/ SUSPECT so if i select COMPLETE/ SUSPECT it should use COMPLETE and if I select SUSPECT it should take SUSPECT ,i need it to write in SQL only (i know we can do this through formula).How to write this by using case? if so please explain me

thanks