Moving avg using SQL

From: 纪晓曦 <sheepjxx(at)gmail(dot)com>
To: pgsql-general(at)postgresql(dot)org
Subject: Moving avg using SQL
Date: 2009-09-04 05:28:22
Message-ID: 37a11ce00909032228n5dec0dfeq1544fdd3fcfad639@mail.gmail.com
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How can I do a moving avg by only using SQL?

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