How to use JOINS
OK, well, mysql has LEFT JOINS, right? OK then, in that case, how the heck do I use them?! I need to join 14 tables (with the exact same structure, columns) together and view all of there contents with a WHERE clause like this: SELECT * FROM t1, t2, t3, t4, t5, etc ORDER BY date DESC or SELECT * FROM theworks WHERE userid = 'userid' Any suggestions? I need that join. WHY? Because it's ambiguous if I dont have it. - Deryck H - http://www.comp-u-exchange.com - 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
Re: How to use JOINS
On Wed, Sep 12, 2001 at 02:13:59AM -0500, Deryck Henson wrote: OK, well, mysql has LEFT JOINS, right? OK then, in that case, how the heck do I use them?! I need to join 14 tables (with the exact same structure, columns) together and view all of there contents with a WHERE clause like this: SELECT * FROM t1, t2, t3, t4, t5, etc ORDER BY date DESC or SELECT * FROM theworks WHERE userid = 'userid' Any suggestions? I need that join. WHY? Because it's ambiguous if I dont have it. I'm not entirely sure, but it sounds like you might be confusing a JOIN with a UNION. JOINs are used to bring together related records (related in the RDBMS sense of related) into larger records composed of columns from each table. A UNION allows you to treat several similarly structured tables as if the are one large table. MySQL doesn't yet have UNIONs (4.0 will), but it does have MERGE tables which allow you to combine several tables into a sort of virtual table against which you can write queries. Hope this helps, Jeremy -- Jeremy D. Zawodny, [EMAIL PROTECTED] Technical Yahoo - Yahoo Finance Desk: (408) 349-7878 Fax: (408) 349-5454 Cell: (408) 685-5936 MySQL 3.23.41-max: up 6 days, processed 131,748,231 queries (248/sec. avg) - 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
Re: How to use JOINS
Merges wont work because they dont allow inserts. But I'll check out UNION. Thanx - Deryck H - http://www.comp-u-exchange.com - Original Message - From: Jeremy Zawodny [EMAIL PROTECTED] To: Deryck Henson [EMAIL PROTECTED] Cc: MySQL [EMAIL PROTECTED] Sent: Wednesday, September 12, 2001 2:56 AM Subject: Re: How to use JOINS On Wed, Sep 12, 2001 at 02:13:59AM -0500, Deryck Henson wrote: OK, well, mysql has LEFT JOINS, right? OK then, in that case, how the heck do I use them?! I need to join 14 tables (with the exact same structure, columns) together and view all of there contents with a WHERE clause like this: SELECT * FROM t1, t2, t3, t4, t5, etc ORDER BY date DESC or SELECT * FROM theworks WHERE userid = 'userid' Any suggestions? I need that join. WHY? Because it's ambiguous if I dont have it. I'm not entirely sure, but it sounds like you might be confusing a JOIN with a UNION. JOINs are used to bring together related records (related in the RDBMS sense of related) into larger records composed of columns from each table. A UNION allows you to treat several similarly structured tables as if the are one large table. MySQL doesn't yet have UNIONs (4.0 will), but it does have MERGE tables which allow you to combine several tables into a sort of virtual table against which you can write queries. Hope this helps, Jeremy -- Jeremy D. Zawodny, [EMAIL PROTECTED] Technical Yahoo - Yahoo Finance Desk: (408) 349-7878 Fax: (408) 349-5454 Cell: (408) 685-5936 MySQL 3.23.41-max: up 6 days, processed 131,748,231 queries (248/sec. avg) - 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
