Re: [firebird-support] Help creating expression index
great solutionthanks! On Wednesday, July 17, 2019, 06:59:44 PM GMT+3, Dimitry Sibiryakov s...@ibphoenix.com [firebird-support] wrote: 17.07.2019 17:54, 'Mr. John' mr_joh...@yahoo.com [firebird-support] wrote: > I want to create a index to improve a query like that: > SELECT * FROM MYTABLE WHERE EXTRACT(YEAR FROM datein)=2019 AND >EXTRACT(MONTH FROM > datein)=1 Rewrite it as SELECT * FROM MYTABLE WHERE datein between date '2019-01-01' and date '2019-02-01' Then you can create an ordinary index for datein. -- WBR, SD. ++ 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
Re: [firebird-support] Help creating expression index
17.07.2019 17:54, 'Mr. John' mr_joh...@yahoo.com [firebird-support] wrote: > I want to create a index to improve a query like that: > SELECT * FROM MYTABLE WHERE EXTRACT(YEAR FROM datein)=2019 AND > EXTRACT(MONTH FROM > datein)=1 Rewrite it as SELECT * FROM MYTABLE WHERE datein between date '2019-01-01' and date '2019-02-01' Then you can create an ordinary index for datein. -- WBR, SD. ++ 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 <*> To visit your group on the web, go to: http://groups.yahoo.com/group/firebird-support/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/firebird-support/join (Yahoo! ID required) <*> To change settings via email: firebird-support-dig...@yahoogroups.com firebird-support-fullfeatu...@yahoogroups.com <*> To unsubscribe from this group, send an email to: firebird-support-unsubscr...@yahoogroups.com <*> Your use of Yahoo Groups is subject to: https://info.yahoo.com/legal/us/yahoo/utos/terms/
[firebird-support] Help creating expression index
HiI want to create a index to improve a query like that: SELECT * FROM MYTABLE WHERE EXTRACT(YEAR FROM datein)=2019 AND EXTRACT(MONTH FROM datein)=1 I can create this index: CREATE DESCENDING MYINDEX ON MYTABLE COMPUTED BY (EXTRACT(YEAR FROM datein) || EXTRACT(MONTH FROM datein) ) and change the query: SELECT * FROM MYTABLE WHERE EXTRACT(YEAR FROM datein)|| EXTRACT(MONTH FROM datein)='20191' index is used,but don't think this is the solution thanks for any help
