[PHP] math calculations query
hi all, i have a script which selects description, price and quantity from a mysql table. i have displayed the results on a page in the form of description, price, quantity but I was wondering how best to go about calculating a total total, ie. sum of quantitys multiplied by sum of prices. Any ideas? Many thanks, Sean. -- PHP General 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] math calculations query
At 08:31 PM 4/26/01 +0100, [EMAIL PROTECTED] wrote: hi all, i have a script which selects description, price and quantity from a mysql table. i have displayed the results on a page in the form of description, price, quantity but I was wondering how best to go about calculating a total total, ie. sum of quantitys multiplied by sum of prices. Generally, that's not how you do that. You'd calculate extended prices based on quantity of item and price, then add all extended prices. 1 Thingy $5 Ext= $5 2 SuperThingy $3 Ext=$6 Total is $11 As opposed to 3 * $8 by the method you described. -- Dave's Engineering Page: http://www.dvanhorn.org Where's dave? http://www.findu.com/cgi-bin/find.cgi?kc6ete-9 -- PHP General 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] math calculations query
oh, I am such a bone head.. but the actual question was how to calculate the totals. i have a column on my form that says $qry[price]*$qry[quantity] which gives me a column of totals but my question is how to total that up??? any ideas? David VanHorn [EMAIL PROTECTED] wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... At 08:31 PM 4/26/01 +0100, [EMAIL PROTECTED] wrote: hi all, i have a script which selects description, price and quantity from a mysql table. i have displayed the results on a page in the form of description, price, quantity but I was wondering how best to go about calculating a total total, ie. sum of quantitys multiplied by sum of prices. Generally, that's not how you do that. You'd calculate extended prices based on quantity of item and price, then add all extended prices. 1 Thingy $5 Ext= $5 2 SuperThingy $3 Ext=$6 Total is $11 As opposed to 3 * $8 by the method you described. -- Dave's Engineering Page: http://www.dvanhorn.org Where's dave? http://www.findu.com/cgi-bin/find.cgi?kc6ete-9 -- PHP General 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 General 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] math calculations query
initialize a total variable to 0. every time you print out a price, $total += $currentprice. at the end you'll have the total. am i misunderstanding you? -jack -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] Sent: Thursday, April 26, 2001 3:43 PM To: [EMAIL PROTECTED] Subject: Re: [PHP] math calculations query oh, I am such a bone head.. but the actual question was how to calculate the totals. i have a column on my form that says $qry[price]*$qry[quantity] which gives me a column of totals but my question is how to total that up??? any ideas? David VanHorn [EMAIL PROTECTED] wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... At 08:31 PM 4/26/01 +0100, [EMAIL PROTECTED] wrote: hi all, i have a script which selects description, price and quantity from a mysql table. i have displayed the results on a page in the form of description, price, quantity but I was wondering how best to go about calculating a total total, ie. sum of quantitys multiplied by sum of prices. Generally, that's not how you do that. You'd calculate extended prices based on quantity of item and price, then add all extended prices. 1 Thingy $5 Ext= $5 2 SuperThingy $3 Ext=$6 Total is $11 As opposed to 3 * $8 by the method you described. -- Dave's Engineering Page: http://www.dvanhorn.org Where's dave? http://www.findu.com/cgi-bin/find.cgi?kc6ete-9 -- PHP General 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 General 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 General 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] math calculations query
SELECT SUM(quantity)*SUM(total) As mySUM FROM table WHERE ... Sincerely, Maxim Maletsky Founder, Chief Developer PHPBeginner.com (Where PHP Begins) [EMAIL PROTECTED] www.phpbeginner.com -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] Sent: Friday, April 27, 2001 4:31 AM To: [EMAIL PROTECTED] Subject: [PHP] math calculations query hi all, i have a script which selects description, price and quantity from a mysql table. i have displayed the results on a page in the form of description, price, quantity but I was wondering how best to go about calculating a total total, ie. sum of quantitys multiplied by sum of prices. Any ideas? Many thanks, Sean. -- PHP General 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 General 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] math calculations query
Maxim Maletsky [EMAIL PROTECTED] wrote: SELECT SUM(quantity)*SUM(total) As mySUM FROM table WHERE Technically, this is correct based on what the original poster (below) stated he wanted, but that's not really what he wanted since there's no real world reason to calculate what he stated he wanted. He must really want the total monetary value of the items returned by the query. That's calculated by multiplying the quantity of each record by the price of each item and summing that for each record. So the correct SQL statement is: SELECT SUM(price*quantity) FROM table_name WHERE ... If he doesn't want to run the query above in addition to his existing query to return individual records, he can calculate this total programatically. Sean, in this case, as you're looping through the records do: $amount_record = $price * $quantity; $amount_total += $amount_record; After the loop is complete, $amount_total will contain the value you want. Alternately, the first line can be eliminated by calculating the amount for each record within the query. [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] wrote: i have a script which selects description, price and quantity from a mysql table. i have displayed the results on a page in the form of description, price, quantity but I was wondering how best to go about calculating a total total, ie. sum of quantitys multiplied by sum of prices. -- Steve Werby President, Befriend Internet Services LLC http://www.befriend.com/ -- PHP General 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]
