possibly -----Original Message----- From: Miretsky, Anya [mailto:[EMAIL PROTECTED]] Sent: Friday, February 15, 2002 2:32 PM To: 'Rick Emery' Subject: RE: Left Join problem - Please Help
When I do this without specifying a left join with just :select biblio.* from biblio,keyword where p_biblio=fk_biblio and keyword="somestring"; it works fairly fast, is it the left join that's making it so slow? -----Original Message----- From: Rick Emery [mailto:[EMAIL PROTECTED]] Sent: Friday, February 15, 2002 3:29 PM To: 'Miretsky, Anya' Cc: '[EMAIL PROTECTED]' Subject: RE: Left Join problem - Please Help I don't think it's hanging. I think it's going through the process of determining joint criteria for 11,900 table entries multiplied by 88,000 other table entries, then doing a text search on the result, which is much slower than an integer search. I'm posting this back to the mysql list to see what the experts think. -----Original Message----- From: Miretsky, Anya [mailto:[EMAIL PROTECTED]] Sent: Friday, February 15, 2002 2:17 PM To: 'Rick Emery' Subject: RE: Left Join problem - Please Help Biblio has 11,901 and keyword has 87,971, also I indexed the keyword column in the keyword table. Is the fact that I have the same name for a column as for the table possibly a problem? -----Original Message----- From: Rick Emery [mailto:[EMAIL PROTECTED]] Sent: Friday, February 15, 2002 3:17 PM To: 'Miretsky, Anya' Subject: RE: Left Join problem - Please Help How many records are in these tables? -----Original Message----- From: Miretsky, Anya [mailto:[EMAIL PROTECTED]] Sent: Friday, February 15, 2002 1:51 PM To: 'Rick Emery' Subject: RE: Left Join problem - Please Help Table structure would be: Biblio table with the following columns: p_biblio int unsigned not null primary key, authors varchar(255), title varchar(255) , citation varchar(255) Keyword table with the following columns: p_keyword int unsigned not null primary key, fk_biblio int unsigned not null, Keyword varchar(255) Sql statement that works: Select distinct biblio.* from biblio left join keyword on biblio.p_biblio=keyword.fk_biblio where fk_biblio<3; Sql statement that doesn't work - msql hangs executing this: Select distinct biblio.* from biblio left join keyword on biblio.p_biblio=keyword.fk_biblio where keyword="SOMESTRING"; -----Original Message----- From: Rick Emery [mailto:[EMAIL PROTECTED]] Sent: Friday, February 15, 2002 2:10 PM To: 'Miretsky, Anya'; '[EMAIL PROTECTED]' Subject: RE: Left Join problem - Please Help Show us your table structure, some table values and the SELECT statement that works and the one that doesn't -----Original Message----- From: Miretsky, Anya [mailto:[EMAIL PROTECTED]] Sent: Friday, February 15, 2002 12:13 PM To: '[EMAIL PROTECTED]' Subject: Left Join problem - Please Help Whenever I try to issue a query which has a left join for two tables and a where clause for a column in the second table that is a varchar the query runs indefinitely. If I change the where clause to search on a numeric type column the query runs and returns expected values. Does anyone know what I am doing wrong? This is my first time using Mysql, so if this isn't the right list to post on, please tell me where I can post beginner mysql questions. Thanks for your help in advance. Anya Miretsky Computer Technology Dept. Brooklyn Botanic Garden 1000 Washington Avenue Brooklyn, NY 11225 (718)623-7265 [EMAIL PROTECTED] --------------------------------------------------------------------- Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php --------------------------------------------------------------------- Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
