sql - How can i use two fields in a SELECT clause that has a "single-group group function" -


i need write query joins lot of queries. connected id. problem in 1 of queries, value have select "single-group group function" , must evaluate condition on on clause must use second selected column, i'm unable add. i'll write lot easier example code:

select frst.firstresult, scnd.firstresult  from(     select firstresult, id_to_compare secondresult table     -- [...] ) frst  join(     select firstresult, id_to_compare secondresult table2     -- [...]  ) scnd  on frst.secondresult=scnd.secondresult  join(     select firstresult, id_to_compare secondresult table3     -- [...] ) trd  on scnd.secondresult=trd.secondresult  -- [...]  join(     select single_group_function(params) firstresult, id_to_compare secondresult table3 --this select cannot done because of group function cannot executed     -- [...] ) trd  on svn.secondresult=eit.secondresult

my problem need compare "secondresult" every select, member group not allowed make query this. i've tried "dual" table it's messy me , don't understand how use it. i've tried joining them in macro query, every single select big enough confusing write. i've taken ideas this post , lot more. have hint acomplish task?

for petition of mt0, minimal complete , verificable problem this:

select frst.firstfield, scnd.firstfield, frst.secondfield (select a1.dummy firstfield, a2.dummy secondfield     dual a1 join dual a2 on 1=1) frst   join (select a1.dummy firstfield, a2.dummy secondfield     dual a1 join dual a2 on 1=1) scnd   on frst.secondfield = scnd.secondfield    join   (select sum(a1.dummy) firstfield, a2.dummy secondfield     dual a1 join dual a2 on 1=1) trd   on trd.secondfield = scnd.secondfield   ;

i expect in case

frst.firstfield  scnd.firstfield  frst.secondfield ---------------- ---------------- -------------------- x                x                1

but instead

error en la línea de comandos : 11 columna : 40 informe de error - error sql: ora-00937: la función de grupo no es de grupo único 00937. 00000 -  "not single-group group function" *cause:     *action:

this sample subquery:

select sum(a1.dummy) firstfield, a2.dummy secondfield dual a1 join dual a2 on 1=1

so expect 1 result row? aggregation no group by does. you'd sum on records, a2.dummy show in result record? dbms complaining about.

what want sum per a2.dummy instead. group column:

select sum(a1.dummy) firstfield, a2.dummy secondfield dual a1 join dual a2 on 1=1 group a2.dummy

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