On Sat, Oct 24, 2015 at 6:41 AM, Rafal Pietrak <rafal@ztk-rp.eu> wrote:
The only way I know to avoid the column name duplication is to explicity select column list: SELECT s.sled,s.length,s....,r.runner as right,r.length as right_length,r....,l.runner as left,l.length as left_length,l.* FROM sleds s JOIN runners l ON (s.left=l.runner) JOIN runners r ON (s.right=r.runner); .... which is truely overtalkative (and thus obfuscates future query analize during code maintenance).
Skimmed...
Using explicit column names is expected - using "*" in non-trivial and production queries is not.
You can move the aliases if you would like.
SELECT *
FROM tablea (col1, col2, col4)
JOIN tableb AS tb1 (col1, col3, col5) USING (col1)
JOIN tableb AS tb2
(col1, col6, col7) USING (col1)
The "USING" clause ensure that only a single "col1" appears in the output.
For all other columns in the duplicate join you need to provide a context-specific alias.
