Display results in SQL that meet the criteria

Question

select only those top 10 hospitals that have both kinds of ICU and SICU beds, ie only hospitals that have at least 1 ICU bed and at least 1 SICU bed can be included in this part of the analysis. Here is what I have so far

select bu.business_name as 'Hospital Name'
,sum(be.license_beds) as Total_Licenses
,case when be.bed_id = 4 then 'ICU' end as "ICU"
,case when be.bed_id = 15 then 'SICU' end as "SICU"
from bed_fact be 
join bed_type bt 
  on be.bed_id = bt.bed_id
join business bu 
  on be.ims_org_id = bu.ims_org_id
where be.bed_id = 4 
    or be.bed_id = 15
and be.license_beds IS NOT NULL
group 
    by bu.business_name
order 
    by Total_Licenses DESC
limit 10
;

I need to some how only count the hospital that has at least one of ICU or SICU value

Answer 1

You want conditional aggregation and a having clause:

select 
    bu.business_name as Hospital_Name,
    sum(be.license_beds) as Total_Licenses,
    sum(be.bed_id = 4) as ICU,
    sum(be.bed_id = 15) as SICU
from bed_fact be 
inner join bed_type bt on be.bed_id = bt.bed_id
inner join business bu on be.ims_org_id = bu.ims_org_id
where be.bed_id in (4, 15) and be.license_beds is not null
group by bu.business_name
having ICU > 0 and SICU > 0
order by Total_Licenses desc
limit 10

If you don't what the counts in the resultset, then move the aggregate functions to the having clause:

select 
    bu.business_name as Hospital_Name,
    sum(be.license_beds) as Total_Licenses
from bed_fact be 
inner join bed_type bt on be.bed_id = bt.bed_id
inner join business bu on be.ims_org_id = bu.ims_org_id
where be.bed_id in (4, 15) and be.license_beds is not null
group by bu.business_name
having sum(be.bed_id = 4) > 0 and sum(be.bed_id = 15) > 0
order by Total_Licenses desc
limit 10