PostgreSQL equivalente per SQL Server GROUP BY WITH ROLLUP

Question

Ho una query SQL Server che utilizza la clausola ROLLUP durante il raggruppamento. Voglio una query equivalente in Postgres. Query in SQL Server è:

SELECT (CASE WHEN acnt_dba_name Is Null THEN 'Total' ELSE acnt_dba_name END) as account, 
     (CASE WHEN evt_name Is Null THEN '' ELSE evt_name END) as event, 
     COUNT(CASE reg_is_complete WHEN true THEN 1 ELSE Null END) as regsComplete, 
     COUNT(CASE WHEN reg_frn_pro_id > 0 AND reg_is_complete = false THEN 1 ELSE Null END) as regsInComplete, 
     COUNT(CASE WHEN reg_frn_pro_id > 0 THEN Null ELSE 1 END) as regsClicks 
FROM  registrations_view 
LEFT JOIN events ON (evt_id = reg_frn_evt_id) 
LEFT JOIN accounts ON (acnt_id = evt_frn_acnt_id) 
WHERE reg_date_created < #CreateODBCDate(url.endDate)# 
AND reg_date_created > #CreateODBCDate(url.startDate)# 
AND reg_is_active = true  -- only active regs 
AND reg_is_test = false  -- only live registrations 
-- AND reg_is_denied = false   -- exclude denied reg statuses (include these for now RWB 8/7/2) 
GROUP BY rollup(acnt_dba_name, evt_name) 
-- Sort with Nulls at the bottom 
ORDER BY acnt_dba_name, evt_name 

Answer 1

with detail as (
    select 
     acnt_dba_name as account, 
     evt_name as event, 
     count(case reg_is_complete when true then 1 else null end) as regscomplete, 
     count(case when reg_frn_pro_id > 0 and reg_is_complete = false then 1 else null end) as regsincomplete, 
     count(case when reg_frn_pro_id > 0 then null else 1 end) as regsclicks 
    from 
     registrations_view 
     left join 
     events on evt_id = reg_frn_evt_id 
     left join 
     accounts on acnt_id = evt_frn_acnt_id 
    where 
     reg_date_created < #CreateODBCDate(url.endDate)# 
     AND reg_date_created > #CreateODBCDate(url.startDate)# 
     and reg_is_active = true  -- only active regs 
     and reg_is_test = false  -- only live registrations 
    group by acnt_dba_name, evt_name 
), account as (
    select 
     account, 
     '' as event, 
     sum(regscomplete) as regscomplete, 
     sum(regsimcomplete) as regsincomplete, 
     sum(regsclicks) as regsclicks 
    from detail 
    group by account 
), total as (
    select 
     'Total' as account, 
     '' as event, 
     sum(regsComplete) as regsComplete, 
     sum(regsImComplete) as regsInComplete, 
     sum(regsClicks) as regsClicks 
    from account 
) 
select * from detail 
union 
select * from account 
union 
select * from total 
order by account, event 

Answer 2

Questa è una risposta generica per l'equivalente di roll up in PostgreSQL.

dato un tavolo t:

create table t (l1 char(1), l2 char(1), i integer); 
insert into t (l1, l2, i) values 
('A', 'X', 1), 
('A', 'Y', 2), 
('B', 'X', 3), 
('B', 'Y', 4); 

E questa query SQL Server: SQL Fiddle

select l1, l2, sum(i) total 
from t 
group by rollup(l1, l2) 

Questo è come farlo in PostgreSQL: SQL Fiddle

Creare aggregando CTE a partire dal dettaglio andando al livello più alto:

with detail as (
    select l1, l2, sum(i) total 
    from t 
    group by l1, l2 
), l2 as (
    select l1, sum(total) total 
    from detail 
    group by l1 
), l1 as (
    select sum(total) total 
    from l2 
) 

Si noti che per le prestazioni il livello successivo aggrega dal livello precedente precedente.

Con quello fatto proprio l'unione del CTEs creazione delle etichette appropriate:

select l1, l2, total 
from detail 
union 
select l1, 'Total', total 
from l2 
union 
select 'Total', '', total 
from l1 
order by l1, l2 

Answer 3

In Postgres 9.5 apparso GROUPING SETS, CUBE e ROLLUP: http://www.postgresql.org/docs/9.5/static/queries-table-expressions.html#QUERIES-GROUPING-SETS