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並前往https://www.postgresonline.com/journal/archives/119-Running-totals-and-sums-using-PostgreSQL-8.4-Windowing-functions.html

Running totals and sums using PostgreSQL 8.4 Windowing ...

With windowing functions, you have the option of doing this. Note in our example we want to exclude the current order from our running total sum ...

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