diff options
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/query.sgml | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/doc/src/sgml/query.sgml b/doc/src/sgml/query.sgml index 497aae416b3..e73e805ec4f 100644 --- a/doc/src/sgml/query.sgml +++ b/doc/src/sgml/query.sgml @@ -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 < W2.temp_lo - AND W1.temp_hi > 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 < w2.temp_lo + AND w1.temp_hi > 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> |