How can I use Math Formula in a MySQL query? - mysql

Question

I am creating a CPM and I am trying to get all the CPM that are not on track. I have the follow code below and I have put the formula in the WHERE clause, but it shows all results. Instead of only results that are less than 0.9.
SELECT cpms.*, site_images.*
FROM ( cpm_images
INNER JOIN site_images ON ( cpm_images.site_image_id = site_images.site_image_id ) )
INNER JOIN cpms
ON
( cpms.cpm_id = cpm_images.cpm_id )
WHERE (
( cpms.cpm_views_count * ( $data - cpms.cpm_date_start ) ) /
( cpms.cpm_views_total * (cpms.cpm_date_end - $data ) )
) < 0.9
No matter what number is calculated it show the all the results. If the number is below 0.9 it shows, if it is above 0.9, it shows.
UPDATE:
the following data is what is being pulled from the datbase.
This is the data from the table.
[cpm_id] => 1
[cpm_title] => Ad Special
[cpm_date_start] => 1556746806
[cpm_date_end] => 1559425206
[cpm_views_total] => 1000
[cpm_views_count] => 500
[cpm_image] =>
[cpm_active] => 1
[site_image_id] => 137
[site_image_file] => cars/3.jpg
[site_image_file_tn] => cars/3.jpg
[site_image_file_org] => cars/3.jpg
[site_image_title] =>
[site_image_description] =>
[site_image_upload_date] => 0
When i places numbers in place of the table row names
( 500 * ( 1557665447 - 1559425206 ) )
/
( 1000 * ( 1556746806 - 1557665447 ) )
it works, so is it possible that the table row names are not showing as int. yet the table is as follows
`cpm_id` int(11) UNSIGNED NOT NULL,
`cpm_title` varchar(255) NOT NULL,
`cpm_date_start` int(11) NOT NULL,
`cpm_date_end` int(11) NOT NULL,
`cpm_views_total` int(11) NOT NULL,
`cpm_views_count` int(11) NOT NULL,
`cpm_image` varchar(255) DEFAULT NULL,
`cpm_active` int(1) DEFAULT NULL
if I have the numbers
( 0 * ( 1557665447 - 1559425206 ) ) / ( 1000 * ( 1556746806 - 1557665447 ) )
it equals to 0 so it shows as it is below 0.9
BUT if i have the follow
( 1000 * ( 1557665447 - 1559425206 ) ) / ( 1000 * ( 1556746806 - 1557665447 ) )
which equals to 1.91561121265 which it shows in the results, but it shouldn't as it is not smaller then 0.9
UPDATE:
if i use the follow
WHERE ( ( cpms.cpm_views_count * ( 1557665447 - 1559425206 ) ) / ( cpms.cpm_views_total * ( 1556746806 - 1557665447 ) ) ) < 0.9
It works, and the following works too
WHERE ( ( cpms.cpm_views_count * ( $date - 1559425206 ) ) / ( cpms.cpm_views_total * ( 1556746806 - $date ) ) ) < 0.9
but as soon as i change it to
WHERE ( ( cpms.cpm_views_count * ( $date - cpms.cpm_date_start ) ) / ( cpms.cpm_views_total * ( cpms.cpm_date_end - $date ) ) ) < 0.9
it does not work, I even try putting brackets around cpms.cpm_date_end and cpms.cpm_date_start and it still failed.

Answer 1

I have found the issue, I had the cpm_views_start and cpm_views_end wrong way around
( ( cpms.cpm_views_count * ( $date - cpms.cpm_date_end ) ) / ( cpms.cpm_views_total * ( cpms.cpm_date_start - $date) ) )
How I realized this was when I put it in as follows
SELECT ( ( cpms.cpm_views_count * ( $date - cpms.cpm_date_end ) ) / ( cpms.cpm_views_total * ( cpms.cpm_date_start - $date) ) ) AS sum_2
it came back a different number. I realize somewhere during coding the string I change the cpm_date_end and cpm_date_start around, yet in where i had it showing on the screen for testing, it was the correct way, so the data on the screen was correct but when it was calculating it in the query, it was wrong way about.
Thank you #nick for doing what you can to help me.