Why wouldn't it be necessary, this is an inner join, so the joined table needs to be evaluated if the matches row is present. Mark
----- Bericht beantwoorden ----- Van: "Gabor Boros gaborbo...@yahoo.com [firebird-support]" <firebird-support@yahoogroups.com> Aan: <firebird-support@yahoogroups.com> Onderwerp: [firebird-support] VIEW optimization Datum: do, apr. 7, 2016 18:34 Hi All, VIEW: CREATE VIEW VIEW1 AS SELECT RDB$RELATION_FIELDS.RDB$RELATION_NAME, RDB$FIELD_NAME FROM RDB$RELATION_FIELDS JOIN RDB$RELATIONS ON RDB$RELATION_FIELDS.RDB$RELATION_NAME=RDB$RELATIONS.RDB$RELATION_NAME; SELECT: SELECT RDB$FIELD_NAME FROM VIEW1 PLAN: PLAN JOIN (VIEW1 RDB$RELATION_FIELDS NATURAL, VIEW1 RDB$RELATIONS INDEX (RDB$INDEX_0)) Plan contains the JOIN but that not needed for the selected field. Is this an SQL standard thing or just Firebird's optimizer not smart enough? Gabor ------------------------------------ ------------------------------------ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Visit http://www.firebirdsql.org and click the Documentation item on the main (top) menu. Try FAQ and other links from the left-side menu there. Also search the knowledgebases at http://www.ibphoenix.com/resources/documents/ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------ Yahoo Groups Links https://info.yahoo.com/legal/us/yahoo/utos/terms/
