php - MySQL photo like count. How to store & count millions of likes for photos? -



php - MySQL photo like count. How to store & count millions of likes for photos? -

i attempting build instagram-like app , not sure how calculate count each photo.

option 1:

user table - user_id - username ... photo table - photo_id - user_id - image_path ... photo_like_relation table - like_id - photo_id - user_id ...

so setup able retrieve count after counting results a query like.

"select * photo_like_relation photo_id = x"

option 2:

user table - user_id - username ... photo table - photo_id - user_id - image_path - like_count ** ... photo_like_relation table - like_id - photo_id - user_id ...

with alternative 2 self explanatory on how retrieve like_count sense messy if there ever lapses in system? perchance like_count total vs count() total of photo_like_relation may not match?

so method better? or there improve method? assume there millions of photos/likes posted in app.

i attempting recreate popular page feature, instagram, grab photos lastly x minutes likes. sense huge burden on scheme loop through of photos posted lastly hour, , count how many records exist in photo_like_relation table respective photo_id.

thoughts? ideas? in advance.

use count() function:

select count(*) photo_like_relation photo_id = x

make sure have index on photo_id column, , should efficient.

php mysql sql

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