CREATE MULTIPLE DATABASES|FOREIGN KEY | SUB-QUERIES | SEQUENCE|BEST EXAMPLE | CLASS #56 | SQL #4

Описание: Students! This class helps to learn more about constraints and sequence s and views in SQL.
1. Firstly we creates Sequence with databases
2. Check constraints
3. Foreign key constraints
4. Views with sub queries
5. Referential integrity
With a best sample practice example.

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