Re: Comparing an alias ...
Julio Faerman writes: Hi ... I am need the following query to work : SELECT min(my_colum) as MINIMAL_VALUE WHERE MINIMAL_VALUE 10 The query is not EXACTLY as this one, but i think it is enough to get you the idea of my problem... What would this mean? The WHERE clause is what determines what rows will be used in the GROUP BY functions, e.g. MIN(). How do you know what rows to use when you need to know what rows to use before you can figure out the criteria for what rows to use? Trying to express in words what you wish to accomplish, I'd say that you want the smallest of all my_column such that this value is greater than ten. This would be equivalent to WHERE my_column 10, but if that's what you want I suppose you wouldn't be asking. Someone suggested HAVING, but as far as I can see using HAVING to accomplish MIN(column)constant is equivalent to WHERE columnconstant. //C - not wearing his glasses -- Carl Troein - Círdan / Istari-PixelMagic - UIN 16353280 [EMAIL PROTECTED] | http://pixelmagic.dyndns.org/~cirdan/ Amiga user since '89, and damned proud of it too. - 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: Comparing an alias ...
HAVING worked OK thus . - What would this mean? The WHERE clause is what determines what rows will be used in the GROUP BY functions, e.g. MIN(). How do you know what rows to use when you need to know what rows to use before you can figure out the criteria for what rows to use? Trying to express in words what you wish to accomplish, I'd say that you want the smallest of all my_column such that this value is greater than ten. This would be equivalent to WHERE my_column 10, but if that's what you want I suppose you wouldn't be asking. Someone suggested HAVING, but as far as I can see using HAVING to accomplish MIN(column)constant is equivalent to WHERE columnconstant. //C - not wearing his glasses -- Carl Troein - Círdan / Istari-PixelMagic - UIN 16353280 [EMAIL PROTECTED] | http://pixelmagic.dyndns.org/~cirdan/ Amiga user since '89, and damned proud of it too. - 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
Comparing an alias ...
Hi ... I am need the following query to work : SELECT min(my_colum) as MINIMAL_VALUE WHERE MINIMAL_VALUE 10 The query is not EXACTLY as this one, but i think it is enough to get you the idea of my problem... Thnx for any help ! []~S julio - 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: Comparing an alias ...
Try to use HAVING instead of WHERE. I hope that will help. Julio Faerman wrote: JF: Hi ... I am need the following query to work : JF: SELECT JF: min(my_colum) as MINIMAL_VALUE JF: WHERE JF: MINIMAL_VALUE 10 JF: JF: The query is not EXACTLY as this one, but i think it is enough to get you JF: the idea of my problem... JF: JF: Thnx for any help ! JF: []~S JF: julio JF: JF: JF: - JF: Before posting, please check: JF:http://www.mysql.com/manual.php (the manual) JF:http://lists.mysql.com/ (the list archive) JF: JF: To request this thread, e-mail [EMAIL PROTECTED] JF: To unsubscribe, e-mail [EMAIL PROTECTED] JF: Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php JF: -- sherzodR [EMAIL PROTECTED] use CGI::Session; - 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
Comparing an alias ...
It won't work this way. SELECT min(my_column) as MINIMAL_VALUE will give you ONE record only. Therefore, an additional condition (which you can get with HAVING, not WHERE) will be meaningless. e.g: SELECT min(my_column) as MINIMAL_VALUE FROM mytable HAVING MINIMAL_VALUE 10 will return an empty set if the minimal value is = 10. This one, will give you some more: SELECT other_column, min(my_column) as MINIMAL_VALUE FROM mytable GROUP BY other_column HAVING MINIMAL_VALUE 10 Here you will get one line for each distinct value of other_column, provided that the minimimum value is bigger than 10. Bye Giuseppe Maxia Hi ... I am need the following query to work : SELECT min(my_colum) as MINIMAL_VALUE WHERE MINIMAL_VALUE 10 The query is not EXACTLY as this one, but i think it is enough to get you the idea of my problem... Thnx for any help ! []~S julio - 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
