Hi all,im a beginner for SQL, and trying to use it with my daily work.Now i catched this question(my title of mail).Suppose there is a table about orders, i want to sum the total amount of each month.There was a statement of mine to november.select sum(order_amount) FROM table_name WHERE order_date between '2016-11-01' AND '2016-11-30';I know it comes a result what i want, but i hope someone can tell me another way to use.After searched, i found there is a function named date_part, but it doesn't work.thanks for any help!Leopold
pgsql-admin by date:
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