Primary key
1. Define the Unique value in the table
2. Does not make link between table
3. Cannot have null value
4. Only one primary key per table
Foreign key
1. It is the column that references the column of another table
2. Make link between table
3. Can have null value
4. Several foreign key allowed
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Chapter:
0:00 Introduction
0:13 Primary key vs foreign key
1:25 Demo
2:01 Primary key table
5:19 Foreign key table
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