Examine the following SQL query, and explain clearly and succintly what it means. Will the query work? Explain why or why not.
WITH processed_users
AS (SELECT LEFT(u.phone_country, 2) AS short_phone_entry,
u.id
FROM users u)
SELECT t.user_id,
t.merchant_country,
Sum(t.amount / fx.rate / Power (10, cd.exponent)) AS amount
FROM transactions t
JOIN fx_rates fx
ON ( fx.ccy = currency
AND fx.base_ccy = 'EUR')
JOIN currency_details cd
ON cd.currency = t.currency
JOIN processed_users pu
ON pu.id = t.user_id
WHERE t.source = 'GAIA'
AND pu.short_phone_country = t.merchant_country
GROUP BY t.user_id,
t.merchant_country
ORDER BY amount DESC;