"primary key vs foreign key" Code Answer's
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primary key vs foreign key
Obedient Ocelot
on Dec 05, 2020
Primary Key :
It is unique column in every table in a database
It can ONLY accept;
- nonduplicate values
- cannot be NULL
Foreign Key:
It is a column that comes from a different table and
using Foreign key tables are related each other
It is the primary key of another table
It can be duplicate or null for another table
Unique Key:
Only unique value and also can contain NULLprimary key vs foreign key
Obedient Ocelot
on Dec 05, 2020
Primary Key :
It is unique column in every table in a database
It can ONLY accept;
- nonduplicate values
- cannot be NULL
Foreign Key:
It is a column that comes from a different table and
using Foreign key tables are related each other
It is the primary key of another table
It can be duplicate or null for another table
Unique Key:
Only unique value and also can contain NULL
difference between primary key and foreign key
Good Gnu
on Mar 24, 2021
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