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ralfhandl committed Jun 30, 2023
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Expand Up @@ -1759,7 +1759,7 @@ <h4 id="3214-aggregate-expression-count"><a name="AggregateExpressioncount" href
<span id="cb21-6"><a href="#cb21-6" aria-hidden="true" tabindex="-1"></a><span class="fu">}</span></span></code></pre></div>
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<h4 id="3215-keyword-from"><a name="Keywordfrom" href="#Keywordfrom">3.2.1.5 Keyword <code>from</code></a></h4>
<p>The <code>from</code> keyword offers a shortcut for a sequence of <a href="Transformationgroupby"><code>groupby</code></a> and <a href="#Transformationaggregate"><code>aggregate</code></a> transformations with the pattern <span class="math inline">\({\tt groupby}(…,{\tt aggregate}(…{\tt\ as\ }D_1))/{\tt aggregate}(D_1{\tt\ with\ }…)\)</span>.</p>
<p>The <code>from</code> keyword offers a shortcut for a sequence of <a href="#Transformationgroupby"><code>groupby</code></a> and <a href="#Transformationaggregate"><code>aggregate</code></a> transformations with the pattern <span class="math inline">\({\tt groupby}(…,{\tt aggregate}(…{\tt\ as\ }D_1))/{\tt aggregate}(D_1{\tt\ with\ }…)\)</span>.</p>
<p>In the following <span class="math inline">\(p_1,…,p_n\)</span> are <a href="#DataAggregationPath">data aggregation paths</a> that are allowed in <code>groupby</code> for <a href="#SimpleGrouping">simple grouping</a>.</p>
<ol type="1">
<li>If <span class="math inline">\(α\)</span> is an <a href="#AggregateExpression">aggregate expression</a> and <span class="math inline">\(g\)</span> is an aggregation method, then <span class="math display">\[α{\tt\ from\ }p_1,…,p_n{\tt\ with\ }g\]</span> is an aggregate expression which evaluates to the value of property <span class="math inline">\(D\)</span> in the single instance in the output set of the following transformation sequence: <span class="math display">\[{\tt groupby}((p_1,…,p_n),{\tt aggregate}(α{\tt\ as\ }D_1))/{\tt aggregate}(D_1{\tt\ with\ }g{\tt\ as\ }D).\]</span></li>
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#### <a name="Keywordfrom" href="#Keywordfrom">3.2.1.5 Keyword `from`</a>

The `from` keyword offers a shortcut for a sequence of [`groupby`](Transformationgroupby) and [`aggregate`](#Transformationaggregate) transformations with the pattern ${\tt groupby}(…,{\tt aggregate}(…{\tt\ as\ }D_1))/{\tt aggregate}(D_1{\tt\ with\ }…)$.
The `from` keyword offers a shortcut for a sequence of [`groupby`](#Transformationgroupby) and [`aggregate`](#Transformationaggregate) transformations with the pattern ${\tt groupby}(…,{\tt aggregate}(…{\tt\ as\ }D_1))/{\tt aggregate}(D_1{\tt\ with\ }…)$.

In the following $p_1,…,p_n$ are [data aggregation paths](#DataAggregationPath) that are allowed in `groupby` for [simple grouping](#SimpleGrouping).

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