diff --git a/doc/src/sgml/query.sgml b/doc/src/sgml/query.sgml
index 6f31a5a1d6..8243bf51af 100644
--- a/doc/src/sgml/query.sgml
+++ b/doc/src/sgml/query.sgml
@@ -726,19 +726,20 @@ SELECT city, max(temp_lo)
which gives us one output row per city. Each aggregate result is
computed over the table rows matching that city.
We can filter these grouped
- rows using HAVING:
+ rows using HAVING and the output count using
+ FILTER:
-SELECT city, max(temp_lo)
+SELECT city, max(temp_lo), count(*) FILTER (WHERE temp_lo < 30)
FROM weather
GROUP BY city
HAVING max(temp_lo) < 40;
- city | max
----------+-----
- Hayward | 37
+ city | max | count
+---------+-----+-------
+ Hayward | 37 | 5
(1 row)
@@ -748,7 +749,7 @@ SELECT city, max(temp_lo)
names begin with S
, we might do:
-SELECT city, max(temp_lo)
+SELECT city, max(temp_lo), count(*) FILTER (WHERE temp_lo < 30)
FROM weather
WHERE city LIKE 'S%' --
GROUP BY city