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Posted to commits@drill.apache.org by ts...@apache.org on 2015/05/19 01:38:41 UTC
[06/51] [partial] drill-site git commit: Website update
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+
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+ <h1>SELECT GROUP BY</h1>
+
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+
+ <div class="int_text" align="left">
+
+ <p>The GROUP BY clause identifies the grouping columns for the query. You typically use a GROUP BY clause in conjunction with an aggregate expression. Grouping columns must be declared when the query computes aggregates with standard functions such as SUM, AVG, and COUNT. Currently, Drill does not support grouping on aliases.</p>
+
+<h2 id="syntax">Syntax</h2>
+
+<p>The GROUP BY clause supports the following syntax: </p>
+<div class="highlight"><pre><code class="language-text" data-lang="text">GROUP BY expression [, ...]
+</code></pre></div>
+<h2 id="parameters">Parameters</h2>
+
+<p><em>column_name</em> </p>
+
+<p>Must be a column from the current scope of the query. For example, if a GROUP BY clause is in a subquery, it cannot refer to columns in the outer query.</p>
+
+<p><em>expression</em> </p>
+
+<p>The list of columns or expressions must match the list of non-aggregate expressions in the select list of the query.</p>
+
+<h2 id="usage-notes">Usage Notes</h2>
+
+<p><em>SelectItems</em> in the SELECT statement with a GROUP BY clause can only contain aggregates or grouping columns.</p>
+
+<h2 id="examples">Examples</h2>
+
+<p>The following query returns sales totals grouped by month: </p>
+<div class="highlight"><pre><code class="language-text" data-lang="text"> 0: jdbc:drill:> select `month`, sum(order_total)
+ from orders group by `month` order by 2 desc;
+ +------------+------------+
+ | month | EXPR$1 |
+ +------------+------------+
+ | June | 950481 |
+ | May | 947796 |
+ | March | 836809 |
+ | April | 807291 |
+ | July | 757395 |
+ | October | 676236 |
+ | August | 572269 |
+ | February | 532901 |
+ | September | 373100 |
+ | January | 346536 |
+ +------------+------------+
+</code></pre></div>
+
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