Question: 1) Define the following in SQL: a) SELECT operations, b) Union Compatibility of two relations 2) Describe the following Relational Model Constraints: ( a) Domain

1) Define the following in SQL:

a) SELECT operations,

b) Union Compatibility of two relations

2) Describe the following Relational Model Constraints:

( a) Domain Constraint,

b) Key Constraint,

c) Entity Integrity Constraint

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