Relational Model Constraints

DBMS: Relational Model Constraints
Topics discussed:
1. Schema Based Constraints:
a. Domain Constraints.
b. Key Constraints.
c. Constraints on Null Values.
d. Entity Integrity Constraints.
e. Referential Integrity Constraints.
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Music:
Axol x Alex Skrindo - You [NCS Release]
#DBMSByNeso #DBMS #RelationalDataModel #RelationalModelConstraints

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00:10 Constraints in the relational model
01:45 Schema based constraints include domain constraints, key constraints, constraints on nulls, entity integrity constraints, and referential integrity constraints.
03:22 A key in a relation uniquely identifies each tuple
04:59 Every relation has at least one super key by default.
06:38 Identifying keys and super keys in a relation
08:10 Schema-based constraints include primary key, entity integrity, and referential integrity.
09:46 Referential integrity constraint ensures that a tuple in one relation refers to an existing tuple in another relation
11:16 Foreign key and the referential integrity constraints
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6:45 Is this a fit example? In table, for roll number 3, not all values of two tuples is same!

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I can't see the difference between key and superkey. Can you help?

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2:30 But many people at facebook signup page enter same value for first name and last name. How database accept those tuple?

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