Eleytherios Stamatogiannakis wrote: > "union all" works exactly like plain "union". It always materializes its > input.
sqlite> explain query plan select 1 union select 2; sele order from deta ---- ------------- ---- ---- 0 0 0 COMPOUND SUBQUERIES 1 AND 2 USING TEMP B-TREE (UNION) sqlite> explain query plan select 1 union all select 2; sele order from deta ---- ------------- ---- ---- 0 0 0 COMPOUND SUBQUERIES 1 AND 2 (UNION ALL) It does not. (In the full "explain" output, "OpenEphemeral" is missing.) Neither with real tables. What particular query behaves unexpectedly for you? Regards, Clemens _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
