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並前往https://towardsdatascience.com/aggregating-and-grouping-data-in-sql-with-group-by-and-partition-by-fd5eaccece75

Aggregating and grouping data in SQL with Group by and ...

Very simple, what I can do is using aggregate SUM() function following by a 'GROUP BY' Clause. In the query, SUM() function will adds up all the values in a ...

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