[英]Daily distinct Sales using T-SQL for Different Models
您可以通過兩個級別的聚合來做到這一點:
select model, sale_date,
sum(count(*)) over(partition by model order by sale_date) sale_qty
from (
select model, serial_number, min(sale_date) sale_date
from mytable
group by model, serial_number
) t
group by model, sale_date
order by model, sale_date
使用這種技術,每個serial_number
僅在其首次出現日期計數一次。
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