From: taizi <taizi2006blog@163.com>
To: pgsql-admin@postgresql.org
Subject: How to query by month?
Date: Tue, 29 Nov 2016 22:08:50 +0800 (CST)
Message-ID: <35257d1c.b253.158b06aaae5.Coremail.taizi2006blog@163.com> (raw)
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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
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