Explain Projects, What is View, union vs union all, how we maintain referential integrity, Types of Triggers in SQL, Where and Having clause?

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Answering questions related to SQL concepts and syntax.

Projects in SQL refer to selecting specific columns from a table.
View in SQL is a virtual table created by a query.
Union combines the results of two or more SELECT statements, while Union All includes duplicates.
Referential integrity is maintained through foreign key constraints.
Types of triggers in SQL include DML triggers and DDL triggers.
Where clause is used to filter rows based on a specified condition, while Having clause is used with GROUP BY to filter groups based on a specified condition.

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