Update Column Data Based On Another Table
I've got 2 tables: 'city' that list over 2000000 rows and 'profile' where each row are associated to a city.
What I want to do is to update cities popularities based on profile without having to scan the hole 2000000 rows of 'city'.
So is it possible to make those 2 query in one so I do not need to do a php loop:
SELECT city, COUNT(city) FROM profile GROUP BY city;
then
UPDATE city SET popularity = COUNT(city) WHERE city.city_id = profile.city
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