SQL: Part II

Contents

• Computing with NULL’s
• Three-valued logic
• Unfortunate consequences
• Another problem, Outerjoin motivation
• Outerjoin flavors and definitions
• Outerjoin examples, Outerjoin syntax
• SQL features covered so far
• INSERT, DELETE, UPDATE
• Constraints, Types of SQL constraints
• NOT NULL constraint examples
• Key declaration, Referential integrity example
• Referential integrity in SQL
• Enforcing referential integrity
• Deferred constraint checking
• General assertion

Summary on tutorial SQL: Part II

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