From 6eee73e4e5b6d499f1a5529f209ce4af86ef5152 Mon Sep 17 00:00:00 2001 From: Peter Eisentraut Date: Fri, 4 Sep 2020 08:19:20 +0200 Subject: [PATCH] doc: Use tags consistently in the tutorial chapter MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Make more consistent use of and . Author: Jürgen Purtz Discussion: https://www.postgresql.org/message-id/flat/158996922318.7035.10603922579567326239@wrigleys.postgresql.org --- doc/src/sgml/query.sgml | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/doc/src/sgml/query.sgml b/doc/src/sgml/query.sgml index c0889743c4c..bdb455f3008 100644 --- a/doc/src/sgml/query.sgml +++ b/doc/src/sgml/query.sgml @@ -564,14 +564,16 @@ SELECT * SELECT * FROM weather LEFT OUTER JOIN cities ON (weather.city = cities.name); + + city | temp_lo | temp_hi | prcp | date | name | location ---------------+---------+---------+------+------------+---------------+----------- Hayward | 37 | 54 | | 1994-11-29 | | San Francisco | 46 | 50 | 0.25 | 1994-11-27 | San Francisco | (-194,53) San Francisco | 43 | 57 | 0 | 1994-11-29 | San Francisco | (-194,53) (3 rows) - + This query is called a left outer join because the table mentioned on the left of the @@ -612,13 +614,15 @@ SELECT W1.city, W1.temp_lo AS low, W1.temp_hi AS high, FROM weather W1, weather W2 WHERE W1.temp_lo < W2.temp_lo AND W1.temp_hi > W2.temp_hi; + + city | low | high | city | low | high ---------------+-----+------+---------------+-----+------ San Francisco | 43 | 57 | San Francisco | 46 | 50 Hayward | 37 | 54 | San Francisco | 46 | 50 (2 rows) - + Here we have relabeled the weather table as W1 and W2 to be able to distinguish the left and right side