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SQL (cont.)

SQL (cont.). Lecture #12. Single-Relation Queries. Null Values. Multi-Relation Queries. Relations as Bags Grouping and Aggregation. Aggregations. SUM, AVG, COUNT, MIN, and MAX can be applied to a column in a SELECT clause to produce that aggregation on the column.

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912 views • 75 slides

Design Theory for Relational Databases

Design Theory for Relational Databases. Functional Dependencies Decompositions Normal Forms. Functional Dependencies. X -> Y is an assertion about a relation R that whenever two tuples of R agree on all the attributes of X , then they must also agree on all attributes in set Y .

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955 views • 63 slides

Department of Computer and Information Science, School of Science, IUPUI

Department of Computer and Information Science, School of Science, IUPUI. Data Modeling Attributes, Roles, Subclasses, Keys and Weak Entities. Dale Roberts, Lecturer Computer Science, IUPUI E-mail: droberts@cs.iupui.edu. Attributes on Relationships.

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336 views • 19 slides

Department of Computer and Information Science, School of Science, IUPUI

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303 views • 19 slides

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Beers name - PowerPoint PPT Presentation

SQL (cont.)

Design Theory for Relational Databases

Department of Computer and Information Science, School of Science, IUPUI

Department of Computer and Information Science, School of Science, IUPUI