Categorizing overlapping data to reduce the time for calling the data.
If the all data are organized in one row, it gets harder for the computer to read the data.
: In one column, multiple same-attribute data existing
Primary Key (= Primary Column)
While categorizing each types of data, there occures a Primary Key.
It's like grouping keys.
Normal Form #2 vs. Normal Form #3
If primary key is getting categorized, it's Normal Form #2.
🏁 Overall the result goes like this ↘️
FK: Foreing Key (참조키, 외래키)
--> The only key that can recognize and relate with other table
--> Showing the data in a form of table relationship.
(For the tool ,I used ERD Cloud)