What is the description of this database
SELECT ‘Active’ ASsource’invoice_number,invoice_date,invoice_total
FROM active_invoices
WHERE invoice_date>=‘2014-06-01’
UNION
SELECT ‘Paid’ ASsource,invoice_number,invoice_date,invoice_total
FROMPaid_invoices
WHEREinvoice_date>= ‘2014-06-01’
ORDER BYinvoice_total DESC
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