如何在sql中获取作为单独总计列的总计

我正试图得到总支付列

Product     Timestamp   Paid                  Total_Paid
A             201801    12                     36
A             201802    11                     36
A             201803    13                     36
B             201801    10                     45
B             201802    15                     45
B             201803    20                     45

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您可以使用窗口函数。例如：

select
  *,
  sum(paid) over(partition by product) as total_paid
from t

select
  *,
  sum(paid) over(partition by product) as total_paid
from t