mysql - Seen logic for Social site function -

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i'm making social site , i'm confused logic seen function. here 

seen table  __________________________________ |seen_id|seen_notif_id|seen_viewers|  ---------------------------------- |   1   |    1200     | 352,1,444  |

with table 

seen_notif_id column

comes 

notif table

all user actions being added notif table , trigger function inside database after insert in notif table added seen table.

for seen_viewers column. if user clicks notification specific id of notification, update column , add user_id. have stock procedure inside database can reverse concat seen_viewers column verify if seen notification id.

this way if user viewed particular post/comments/tags/etc .

is okay implement? making table unnotify?

that not way @ all. read tutorials on database normalization. if want track saw what, not keep comma-seperated list of ids: make seperate table each id seperate row. basic database design. research one-to-many , many-to-many relationships see how done. not wasting time running 'reverse-concat' function.


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