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picture1_Data Processing Ppt 72608 | Relationalalgebra


picture2_Data Processing Ppt 72608 | Relationalalgebra picture3_Data Processing Ppt 72608 | Relationalalgebra

 143x       Filetype PPT       File size 0.34 MB       Source: www.ceng.metu.edu.tr


File: Data Processing Ppt 72608 | Relationalalgebra
Relational Query Languages • Query languages: Allow manipulation and retrieval of data from a database. • Relational model supports simple, powerful query languages: – Strong formal foundation based on logic ...

icon picture PPT Filetype Power Point PPT | Posted on 31 Aug 2022 | 2 years ago
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...Relational query languages allow manipulation and retrieval of data from a database model supports simple powerful strong formal foundation based on logic allows for much optimization programming qls not expected to be turing complete intended used complex calculations support easy efficient access large sets two mathematical form the basis real e g sql implementation algebra more operational very useful representing execution plans calculus lets users describe what they want rather than how compute it non declarative understanding is key processing preliminaries applied relation instances result also instance schemas input relations are fixed schema given determined by definition language constructs positional vs named field notation easier definitions readable both in r sid bid day example sailors reserves our examples sname rating age we ll use or s dustin assume that names lubber fields results rusty inherited yuppy guppy basic operations selection selects subset rows projection de...
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