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select monthname(order_date) as Bulan, sum(after_discount) as 'Total Nilai Transaksi' from order_detail where extract(year from order_date) = 2021 and is_valid = 1 group by 1 order by 2 desc;
select monthname(order_date) as Bulan, sum(after_discount) as 'Total Nilai Transaksi' from order_detail where extract(year from order_date) = 2021 and is_valid = 1 group by 1 order by 2 desc;