Hi!
I've got to unite two tables preserving some of their columns as distinct,
so to comply with the "same number, same type" requirement of the UNION
operator I use placeholder values, like this:
SELECT united.customer_id,
united.document_id,
SUM(united.debt_moved) AS debt_moved,
SUM(united.debt_total) AS debt_total,
SUM(debt_total - debt_moved) AS delta
FROM
(SELECT debt.customer_id,
debt.document_id,
debt.debt AS debt_total,
0.00 AS debt_moved --placeholder value
FROM debt
UNION ALL SELECT debt_movement.customer_id,
debt_movement.document_id,
debt_movement.debt AS debt_moved,
0.00 AS debt_total -- placeholder value
FROM debt_movement
WHERE debt_movement.date_time>'04/03/2013' ) AS united
GROUP BY customer_id,
document_id
But I found no obvious way to do that in SA. Any thoughts? Thanks!
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