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doc: Change table alias names to lower case in tutorial chapter 

This is needlessly different from our usual style otherwise.

Author: Jürgen Purtz <juergen@purtz.de>
Discussion: https://www.postgresql.org/message-id/flat/158996922318.7035.10603922579567326239@wrigleys.postgresql.org
This commit is contained in:
Peter Eisentraut 2020-09-04 08:45:57 +02:00
parent 79fd620b20
commit 49d7165117
2 changed files with 13 additions and 13 deletions
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14
doc/src/sgml/query.sgml
View File

@ -609,11 +609,11 @@ SELECT *
following query:
<programlisting>
SELECT W1.city, W1.temp_lo AS low, W1.temp_hi AS high,
W2.city, W2.temp_lo AS low, W2.temp_hi AS high
FROM weather W1, weather W2
WHERE W1.temp_lo &lt; W2.temp_lo
AND W1.temp_hi &gt; W2.temp_hi;
SELECT w1.city, w1.temp_lo AS low, w1.temp_hi AS high,
w2.city, w2.temp_lo AS low, w2.temp_hi AS high
FROM weather w1, weather w2
WHERE w1.temp_lo &lt; w2.temp_lo
AND w1.temp_hi &gt; w2.temp_hi;
</programlisting>
<screen>
@ -624,8 +624,8 @@ SELECT W1.city, W1.temp_lo AS low, W1.temp_hi AS high,
(2 rows)
</screen>
Here we have relabeled the weather table as <literal>W1</literal> and
<literal>W2</literal> to be able to distinguish the left and right side
Here we have relabeled the weather table as <literal>w1</literal> and
<literal>w2</literal> to be able to distinguish the left and right side
of the join. You can also use these kinds of aliases in other
queries to save some typing, e.g.:
<programlisting>

12
src/tutorial/basics.source
View File

@ -126,13 +126,13 @@ SELECT *
FROM weather LEFT OUTER JOIN cities ON (weather.city = cities.name);
-- Suppose we want to find all the records that are in the temperature range
-- of other records. W1 and W2 are aliases for weather.
-- of other records. w1 and w2 are aliases for weather.
SELECT W1.city, W1.temp_lo, W1.temp_hi,
W2.city, W2.temp_lo, W2.temp_hi
FROM weather W1, weather W2
WHERE W1.temp_lo < W2.temp_lo
and W1.temp_hi > W2.temp_hi;
SELECT w1.city, w1.temp_lo, w1.temp_hi,
w2.city, w2.temp_lo, w2.temp_hi
FROM weather w1, weather w2
WHERE w1.temp_lo < w2.temp_lo
and w1.temp_hi > w2.temp_hi;
-----------------------------