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

12
src/tutorial/basics.source
View File

@ -126,13 +126,13 @@ SELECT *
FROM weather LEFT OUTER JOIN cities ON (weather.city = cities.name); 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 -- 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, SELECT w1.city, w1.temp_lo, w1.temp_hi,
W2.city, W2.temp_lo, W2.temp_hi w2.city, w2.temp_lo, w2.temp_hi
FROM weather W1, weather W2 FROM weather w1, weather w2
WHERE W1.temp_lo < W2.temp_lo WHERE w1.temp_lo < w2.temp_lo
and W1.temp_hi > W2.temp_hi; and w1.temp_hi > w2.temp_hi;
----------------------------- -----------------------------