How can I bypass this issue? SQL Error ORA-00904 - sql

Question

I'm into troubles with this code:
SELECT
s.codcli,
s.consfin consistenza_iniziale,
s.periodo,
ss.consfin consistenza_finale,
ss.periodo,
(SELECT sum(quanti) somma_bonifici_ingresso
FROM mov WHERE tipope IN ('VE1', 'VE5', 'VE9') AND (datope BETWEEN to_date('01-01-2016', 'DD-MM-YYYY') AND to_date('30-07-2017', 'DD-MM-YYYY')) AND mov.codcli = s.codcli
GROUP BY codcli, tipope) as somma_bonifici_ingresso,
(SELECT sum(quanti) somma_bonifici_ingresso
FROM mov WHERE tipope IN ('PR1', 'PR5', 'PR9') AND (datope BETWEEN to_date('01-01-2016', 'DD-MM-YYYY') AND to_date('30-07-2017', 'DD-MM-YYYY')) AND mov.codcli = s.codcli
GROUP BY codcli, tipope) as somma_bonifici_uscita,
(ss.consfin - (somma_bonifici_ingresso - somma_bonifici_uscita) - s.consfin)/s.consfin as variazione
FROM sre s
LEFT JOIN sre ss on s.codcli = ss.codcli
WHERE s.periodo=to_date('01-01-2016', 'DD-MM-YYYY')
AND ss.periodo=to_date('30-06-2017', 'DD-MM-YYYY')
AND s.consfin>0
ORDER BY s.codcli
I'm getting an 00904 error not a valid identifier. I need to insert a new column arranging the columns somma_bonifici_ingresso and somma_bonifici_uscita. I have to do some calculations but it seems like it isn't able to find those columns I guess for the aliases...

Answer 1

You cannot re-use a column alias in the same select, so use a subquery:
SELECT s.*,
(consistenza_iniziale - (somma_bonifici_ingresso - somma_bonifici_uscita) - consistenza_iniziale) / consistenza_iniziale as variazione
FROM (SELECT s.codcli, s.consfin as consistenza_iniziale, s.periodo,
ss.consfin as consistenza_finale, ss.periodo,
(SELECT sum(quanti)
FROM mov
WHERE tipope IN ('VE1', 'VE5', 'VE9') AND
(datope BETWEEN DATE '2016-01-01' AND DATE '2017-07-30') AND
mov.codcli = s.codcli
) as somma_bonifici_ingresso,
(SELECT sum(quanti)
FROM mov
WHERE tipope IN ('PR1', 'PR5', 'PR9') AND
(datope BETWEEN '2016-01-01' AND DATE '2017-07-30') AND
mov.codcli = s.codcli
) as somma_bonifici_uscita,
FROM sre s LEFT JOIN
sre ss
ON s.codcli = ss.codcli
WHERE s.periodo = DATE '2016-01-01' AND
ss.periodo = DATE '2017-07-30' AND
s.consfin > 0
) s
ORDER BY codcli;
Other notes:
Use date constants instead of literals. DATE for dates and TIMESTAMPS if there is a time.
Check your dates. There are differences between the dates in the subqueries and outer WHERE.
The GROUP BY is unnecessary -- and bad -- in the subqueries. You could end up with a "too many rows returned" error.