I have a couple of tables in MySQL that I'm working with that do not have any relation. They do have a column of similar data (Postal Codes / Zip Codes). What I have to do with these tables is compare the postal codes from one table compare them to the postal codes from the first table and count them.
For Example. Table A has a postal code of T0A and T0B (I use only the first three characters in the postal code as this is all I need to compare against) Table B has 13 rows where the postal code matches T0A and 3 rows where the postal code matches T0B.
So the outcome would look like:
T0A = 13 T0B = 3
HOWEVER, then I need to take these and separate them by city, so since both T0A and T0B could be one city I would need to take those and add them together and get something like.
Edmonton = 16
I've been doing this with for loops and arrays. So I'm reading the data from table A into one array and the data from table b into another array. Then I compare the postal codes from table B to the postal codes in table A using nested for loops in order to count the number of occurrences of the postal codes and then I store them in another array. This is all fine and dandy however separate the counts into their correct cities and I'm sitting here thinking there must be an easier way to do this.
Structure - Table A
jos_postalzip_redirect | CREATE TABLE `jos_postalzip_redirect` ( `id` int(11) NOT NULL auto_increment, `country_code` varchar(2) NOT NULL, `prov_state_code` varchar(2) NOT NULL, `city` varchar(60) NOT NULL, `postal_zip` varchar(6) NOT NULL, `email_address` varchar(60) default NULL,
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