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itan_hunt
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Файл:q8
.sql SELECT
source.name AS source_name,
SUM(sale.sale_sum) AS volume
FROM source
LEFT JOIN client
ON source.id = client.source_id
LEFT JOIN sale
ON client.id = sale.client_id
GROUP BY source_name
ORDER BY volume DESC;
source.name AS source_name,
SUM(sale.sale_sum) AS volume
FROM source
LEFT JOIN client
ON source.id = client.source_id
LEFT JOIN sale
ON client.id = sale.client_id
GROUP BY source_name
ORDER BY volume DESC;