[FLINK-9296] [table] Add documentation for DISTINCT aggregates

mpdn · Jul 24, 2018 · 365d9c1 · 365d9c1
1 parent 9f181a4
commit 365d9c1
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/docs/dev/table/sql.md b/docs/dev/table/sql.md
@@ -2222,7 +2222,7 @@ COUNT(value [, value]* )
 {% endhighlight %}
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-        <p>Returns the number of input rows for which <i>value</i> is not null.</p>
+        <p>Returns the number of input rows for which <i>value</i> is not null. Use <code>COUNT(DISTINCT value)</code> for the number of unique values in the column or expression.</p>
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@@ -2255,7 +2255,7 @@ SUM(numeric)
 {% endhighlight %}
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-        <p>Returns the sum of <i>numeric</i> across all input values.</p>
+        <p>Returns the sum of <i>numeric</i> across all input values. Use <code>SUM(DISTINCT value)</code> for the sum of unique values in the column or expression.</p>
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