Relational Algebra - CBCB
• Aggregate operation in relational algebra E is any relational-algebra expression –G1, G2 …, Gn is a list of attributes on which to group (can be empty) –Each F i is an aggregate function –Each A i is an attribute name • Note: Some books/articles use γ instead of (Calligraphic G), , , ( ), ( , , ( )( ) 1 2 1 1 2 2 E G G Gn F A F A ...
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