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SELECT invoices.invoice_number, customer.customer_name, COUNT(contacts.contact_id) AS contact_count FROM customer JOIN invoices ON customer.id = invoices.customer_id LEFT JOIN contacts ON contacts.customer_id = customer.id WHERE contacts.contact_time < invoices.invoice_date GROUP BY invoices.invoice_number, customer.customer_name ORDER BY invoices.invoice_number ASC;
select product_name, sum(amount_due), sum(amount_paid), sum(amount_cancelled), sum(amount_refunded)
from (
select product_name,
case when time_due is not null then line_total_price end amount_due,
case when time_paid is not null then line_total_price end amount_paid,
case when time_cancelled is not null then line_total_price end amount_cancelled,
case when time_refunded is not null then line_total_price end amount_refunded
from product a left join invoice_item c on a.id = c.product_id
left join invoice b on b.id = c.invoice_id
) temp_table
group by product_name order by product_name
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