Re: [PHP-DB] Problem with SQL query on several tables
Thanks, but I want wo JOIN data from three tables and then to order all data by datestamp. Can I Do It ? Thanks, Rosen Andrey Hristov wrote in message 071401c17759$f5873c80$0b01a8c0@ANDreY... Mysql says that in the join there are some columns with namer datestamp so you have to choose by which you want to order. Think about making LEFT JOIN. select * from f1 LEFT JOIN f2 ON f1.some_field=f2.some_field LEFT JOIN f3 ON f2.some_field=f3.some_field roder by f1.datestamp; Regards, Andrey Hristov IcyGEN Corporation http://www.icygen.com BALANCED SOLUTIONS - Original Message - From: Rosen [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Tuesday, November 27, 2001 5:34 PM Subject: [PHP-DB] Problem with SQL query on several tables Hi, I'm trying to execute SQL query: select * from f1,f2,f3 order by datestamp MySQL returns me an error: 1052 - Column: 'datestamp' in order clause is ambigious The tables f1,f2,f3 have some structure. The field datestamp is type datetime. Why I can't order query on 'datestamp' ? Thanks, Rosen -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
Re: [PHP-DB] Problem with SQL query on several tables
It sounds to me like what you're trying to do is APPEND data from three similarly structured tables into one entity ordered by a column common to all 3 tables called datestamp. If I'm mistaken, then please ignore all of the following: Approach #1 (mysql) Create a temporary table with the columns you need to process, indexed by datestamp, and append the data from the 3 tables-- then query the temp table. Approach #2 (php) Create an associative array (hash table) in php then append the data from the 3 tables, order as desired, and process. Which you choose would depend on which you find simpler-- the mysql approach would probably take a more time, but be easier to reuse on successive pages. ib Rosen wrote: Thanks, but I want wo JOIN data from three tables and then to order all data by datestamp. Can I Do It ? Thanks, Rosen Andrey Hristov wrote in message 071401c17759$f5873c80$0b01a8c0@ANDreY... Mysql says that in the join there are some columns with namer datestamp so you have to choose by which you want to order. Think about making LEFT JOIN. select * from f1 LEFT JOIN f2 ON f1.some_field=f2.some_field LEFT JOIN f3 ON f2.some_field=f3.some_field roder by f1.datestamp; Regards, Andrey Hristov IcyGEN Corporation http://www.icygen.com BALANCED SOLUTIONS - Original Message - From: Rosen [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Tuesday, November 27, 2001 5:34 PM Subject: [PHP-DB] Problem with SQL query on several tables Hi, I'm trying to execute SQL query: select * from f1,f2,f3 order by datestamp MySQL returns me an error: 1052 - Column: 'datestamp' in order clause is ambigious The tables f1,f2,f3 have some structure. The field datestamp is type datetime. Why I can't order query on 'datestamp' ? Thanks, Rosen -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
RE: [PHP-DB] Problem with SQL query on several tables
Thanks, but I want wo JOIN data from three tables and then to order all data by datestamp. There must be more than one column called datestamp, this is why mysql is telling you it's ambiguous. So you need to tell it which table's datestamp column you wish to use. for example your new query could be: select * from f1,f2,f3 order by f1.datestamp Also, presumably all the tables have a column which relates to one of the other columns in some way? If so, and I can't reason the point in doing it if there is not, maybe you should look at the JOIN syntax from the mysql manual. If nothing else it will give you a better understanding of joining tables and the problems you may face. M: Can I Do It ? Thanks, Rosen Andrey Hristov wrote in message 071401c17759$f5873c80$0b01a8c0@ANDreY... Mysql says that in the join there are some columns with namer datestamp so you have to choose by which you want to order. Think about making LEFT JOIN. select * from f1 LEFT JOIN f2 ON f1.some_field=f2.some_field LEFT JOIN f3 ON f2.some_field=f3.some_field roder by f1.datestamp; Regards, Andrey Hristov IcyGEN Corporation http://www.icygen.com BALANCED SOLUTIONS - Original Message - From: Rosen [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Tuesday, November 27, 2001 5:34 PM Subject: [PHP-DB] Problem with SQL query on several tables Hi, I'm trying to execute SQL query: select * from f1,f2,f3 order by datestamp MySQL returns me an error: 1052 - Column: 'datestamp' in order clause is ambigious The tables f1,f2,f3 have some structure. The field datestamp is type datetime. Why I can't order query on 'datestamp' ? Thanks, Rosen -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
