COVERING INDEX means that all required fields for the query can be read from the index alone, without accessing the row itself.
-----Ursprüngliche Nachricht----- Von: sqlite-users [mailto:sqlite-users-boun...@mailinglists.sqlite.org] Im Auftrag von x Gesendet: Donnerstag, 23. November 2017 17:34 An: sqlite-users@mailinglists.sqlite.org Betreff: [EXTERNAL] [sqlite] help with EXPLAIN QUERY PLAN Can anyone tell me why the detail column sometime states ‘USING INDEX ....’ and other time ‘USING COVERING INDEX ...’? At first I thought USING COVERING INDEX implied the search was searching only the first m columns of an n column index (m less than n) but I’ve also seen USING COVERING INDEX when the query was searching all of the columns in the index. _______________________________________________ sqlite-users mailing list sqlite-users@mailinglists.sqlite.org http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users ___________________________________________ Gunter Hick | Software Engineer | Scientific Games International GmbH | Klitschgasse 2-4, A-1130 Vienna | FN 157284 a, HG Wien, DVR: 0430013 | (O) +43 1 80100 - 0 May be privileged. May be confidential. Please delete if not the addressee. _______________________________________________ sqlite-users mailing list sqlite-users@mailinglists.sqlite.org http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users
