I need more explanation about data types?

Question

Data types

Answer 1

data types specify wich type of data will be contained in the column eg. if I want to put a name a i'll choose char,if number integrer i'll use int, if a number like 7.2 u must use floa ot double

Answer 2

they specify what type of value your column can contain eg int user_id it simply means that the user_id has to be an interger!

Answer 3

they specify what type of value your column can contain eg int user_id it simply means that the user_id has to be an interger!