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    <title>MongoDB Jira</title>
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    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[DOCS-3376] Comment on: &quot;manual/tutorial/aggregation-zip-code-data-set.txt&quot;</title>
                <link>https://jira.mongodb.org/browse/DOCS-3376</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Hello.&lt;/p&gt;

&lt;p&gt;About the example &quot;Return Average City Population by State&quot; I spent a lot of time figuring out why the query was so complex.&lt;/p&gt;

&lt;p&gt;I had to analyze the dataset to see that cities can have the same name in the same state. Maybe it is obvious for americans but not really for foreign people like me &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/smile.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;

&lt;p&gt;I think it should me mentioned somewhere that we need to group on state AND cities because 2 cities can have the same name, in the same state.&lt;br/&gt;
Else, the simple following request would be enough:&lt;/p&gt;

&lt;p&gt;db.collection.aggregate(&lt;span class=&quot;error&quot;&gt;&amp;#91;{$group: { _id: &amp;quot;$state&amp;quot;, average: {$avg: &amp;quot;$pop&amp;quot; }}}&amp;#93;&lt;/span&gt;)&lt;/p&gt;

&lt;p&gt;Michel&lt;/p&gt;
</description>
                <environment>&lt;br/&gt;
&lt;br/&gt;
*Location*: &lt;a href=&quot;http://docs.mongodb.org/manual/tutorial/aggregation-zip-code-data-set/&quot;&gt;http://docs.mongodb.org/manual/tutorial/aggregation-zip-code-data-set/&lt;/a&gt;&lt;br/&gt;
*User-Agent*: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.86 Safari/537.36&lt;br/&gt;
*Referrer*: &lt;a href=&quot;http://docs.mongodb.org/manual/core/aggregation-pipeline/&quot;&gt;http://docs.mongodb.org/manual/core/aggregation-pipeline/&lt;/a&gt;&lt;br/&gt;
*Screen Resolution*: 1440 x 900&lt;br/&gt;
*repo*: docs&lt;br/&gt;
*source*: tutorial/aggregation-zip-code-data-set&lt;br/&gt;
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        <key id="135683">DOCS-3376</key>
            <summary>Comment on: &quot;manual/tutorial/aggregation-zip-code-data-set.txt&quot;</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="1" iconUrl="https://jira.mongodb.org/images/icons/priorities/blocker.svg">Blocker - P1</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="xgen-internal-docs">Docs Collector User</reporter>
                        <labels>
                            <label>collector-298ba4e7</label>
                    </labels>
                <created>Fri, 9 May 2014 10:24:34 +0000</created>
                <updated>Thu, 8 Dec 2016 23:01:27 +0000</updated>
                            <resolved>Fri, 25 Jul 2014 18:55:13 +0000</resolved>
                                                    <fixVersion>v1.3.8</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="671697" author="kay.kim@10gen.com" created="Fri, 25 Jul 2014 18:55:14 +0000"  >&lt;p&gt;Add note that a city can have more than one zip code.&lt;/p&gt;</comment>
                            <comment id="671695" author="xgen-internal-githook" created="Fri, 25 Jul 2014 18:54:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kay-kim&apos;, u&apos;name&apos;: u&apos;kay&apos;, u&apos;email&apos;: u&apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-3376&quot; title=&quot;Comment on: &amp;quot;manual/tutorial/aggregation-zip-code-data-set.txt&amp;quot;&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-3376&quot;&gt;&lt;del&gt;DOCS-3376&lt;/del&gt;&lt;/a&gt; clarify city can have multiple zip codes and hence in example collection, multiple documents&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/01b5a18e06fe9a10cebb70eaeb04f1ab4aaf6f08&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/01b5a18e06fe9a10cebb70eaeb04f1ab4aaf6f08&lt;/a&gt;&lt;/p&gt;</comment>
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