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Databases 1

Databases 1. Third lecture. More SQL. Relations as Bags Grouping and Aggregation Database Modification. Reminder: SQL basic statement. The principal form of a query is: SELECT desired attributes FROM one or more tables WHERE condition about tuples of the tables.

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Database Systems

Database Systems. Relations as Bags Grouping and Aggregation Database Modification. Union, Intersection, and Difference. Union, intersection, and difference of relations are expressed by the following forms, each involving sub-queries: ( sub-query ) UNION ( sub-query )

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522 views • 44 slides

More SQL

More SQL. Relations as Bags Grouping and Aggregation Database Modification. Union, Intersection, and Difference. Union, intersection, and difference of relations are expressed by the following forms, each involving subqueries: ( subquery ) UNION ( subquery )

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580 views • 44 slides

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Likes natural join serves - PowerPoint PPT Presentation

Databases 1

Database Systems

More SQL