It is never a good idea to rely on automatically assigned column names. If you want reproducible, predictable, release independant column names then please assign them with the AS clause.
-----Ursprüngliche Nachricht----- Von: Marcus Bergner [mailto:marcusberg...@gmail.com] Gesendet: Sonntag, 25. Jänner 2015 14:16 An: sqlite-users@sqlite.org Betreff: [sqlite] Invalid column prefix returned in SELECT with joined subquery Hi, Using the latest amalgamation build sqlite-autoconf-3080801 I'm seeing the following inconsistent behaviour: $ ./sqlite3 sqlite> .headers on sqlite> pragma short_column_names; 1 sqlite> pragma full_column_names; 0 sqlite> create table tbl1 (id1 integer, s1 text); create table tbl2 (id2 sqlite> integer, s2 text); insert into tbl1 values (1, 'v1'); insert sqlite> into tbl2 values (1, 'v2'); select x.id1, x.s1, y.s2 from tbl1 x sqlite> inner join tbl2 y on x.id1=y.id2; id1|s1|s2 1|v1|v2 So far so good, everything as expected. If I rewrite the above select statement to do a join with a subquery instead the resulting output changes in an unexpected way. sqlite> select x.id1, x.s1, subq.s2 from tbl1 x inner join (select * sqlite> from tbl2 y where y.id2=1) subq on x.id1=subq.id2; x.id1|x.s1|subq.s2 1|v1|v2 Here we get unexpected column prefixes on all fetched columns. If I rewrite the query again to a subq.* query the behaviour is different again where only the first two columns have prefixes. sqlite> select x.id1, x.s1, subq.* from tbl1 x inner join (select * from tbl2 y where y.id2=1) subq on x.id1=subq.id2; x.id1|x.s1|id2|s2 1|v1|1|v2 Expected behaviour: returned columns should not contain prefixes in any of the above scenarios. Kind regards, Marcus Bergner _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users ___________________________________________ Gunter Hick Software Engineer Scientific Games International GmbH FN 157284 a, HG Wien Klitschgasse 2-4, A-1130 Vienna, Austria Tel: +43 1 80100 0 E-Mail: h...@scigames.at This communication (including any attachments) is intended for the use of the intended recipient(s) only and may contain information that is confidential, privileged or legally protected. Any unauthorized use or dissemination of this communication is strictly prohibited. If you have received this communication in error, please immediately notify the sender by return e-mail message and delete all copies of the original communication. Thank you for your cooperation. _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
