[英]Daily distinct Sales using T-SQL for Different Models
您可以通过两个级别的聚合来做到这一点:
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
使用这种技术,每个serial_number
仅在其首次出现日期计数一次。
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