'Relations r' diaporamas de présentation

Formal Relational Query Languages (BE V CSE)

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Is Structural Underdetermination Possible?

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CSC271 Database Systems

CSC271 Database Systems. Lecture # 7. Summary: Previous Lecture. Relational keys Integrity constraints Views. The Relational Algebra and Relational Calculus. Chapter 4. Introduction. Relational algebra and relational calculus are formal languages associated with the relational model

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Two-Pass Algorithms Based on Sorting

Two-Pass Algorithms Based on Sorting. SECTION 15.4 Rupinder Singh. Two-Pass Algorithms Based on Sorting. Two-pass Algorithms: where data from the operand relations is read into main memory, processed in some way, written out to disk again, and then reread from disk to complete the operation.

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Domain Restriction on Relation

Domain Restriction on Relation. domain restriction operator , , restricts a relation to only those members whose domain is in a specified set. Let R: M x P be { (m1, p1), (m2, p2), (m3, p1), (m3, p3), (m4, p3) } and S = { m1,m3}, then :

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Two Pass Algorithm Based On Sorting

Two Pass Algorithm Based On Sorting. Section 15.4 CS257 Spring2013 Swapna Vemparala Class ID : 131 . Contents. Two-Pass Algorithms Two-Phase, Multiway Merge-Sort Duplicate Elimination Using Sorting Grouping and Aggregation Using Sorting A Sort-Based Union Algorithm

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Assignment Operation

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