What is the description of this database
SELECT ‘Active’ ASsource,invoice_number,invoice_date,invoice_total
FROM invoices
WHEREinvoice_total,-payment_total,-credit_total>0
UNION
SELECT ‘Paid’ AS source, ASsource,invoice_number,invoice_date,invoice_total
FROM invoices
WHERE invoice_total,-payment_total,-credit_total>0
ORDER BY invoice_total DESC
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