Question

I must select in same table two project.project_dates (one for start and one for end) in the table I’ve two fields project.start = true and project.end = true for identify it

What should the SQL query look like?

I have tried:

SELECT 
    pz.cognome AS Cognome,
    (select s.presa_in_carico_data from tbl_progetto s where s.is_progetto = 1 AND                    
        s.cc_id_fk = cc.cc_id) as Start,
    (select e.presa_in_carico_data from tbl_progetto e where e.is_dimissione = 1 AND 
        e.cc_id_fk = cc.cc_id) as End, 
    trf.trf_note AS "Tipo trattam.",
    trf.trf_prezzou as Retta,
    COUNT(tra.trt_id) AS "N.GG." /*<-- this is normal count from date range select from user(#) */
FROM
    tbl_progetto p 
    JOIN tbl_cartellaclinica cc ON cc.cc_id = p.cc_id_fk
    JOIN tbl_paziente pz ON pz.id = cc.pz_fk_id
    JOIN tbl_distretti_sanitari di ON pz.distretto_appartenenza = di.dss_id
    JOIN tbl_trattamenti tra ON p.pr_id = tra.pr_fk_id    
WHERE
    tra.trt_data BETWEEN '2012-08-01' AND '2012-08-31' AND
    p.pr_faseriab_fk = 4
GROUP BY cc_id

Answer 1

select p.id as ProjectId,
(select s.date from project_dates s where s.start = true and s.project_id = p.id) as StartDate,
(select e.date from project_dates e where e.end = true and e.project_id = p.id) as EndDate
into #temp
from Project p 

Update:

To answer your comment, again I have to make assumptions about how things look in your database, but I would do something like this:

Create a temp-table for storing the result of the above query (see changes).. Then:

select p.id
       (select count(1) from Meeting m where m.date between '2012-01-01' and '2012-08-31' and m.project_id = p.id) as Count1
       (select count(1) from Meeting m where m.date between (select StartDate from #temp where ProjectId = p.id) and (select EndDate from #temp where ProjectId = p.id) and m.project_id = p.id) as count2
from Project p 
[where p.id = <something>]