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Simply put: I have a table with 2 columns: one is username and other is nickname.
I have another table where I have 2 columns: one is username and other is countNicknames.
I want countNicknames to contain the number of nicknames each user has (and whenever I insert a new nickname to the table1, the value under table2.countNicknames will automatically update.
Can you please write down how to construct the second table to reference the first one?
Why not just count when you need the value?