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- <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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