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In database theory, relational algebra is a theory that uses algebraic structures for modeling data and defining queries on it with well founded semantics. The theory was introduced by Edgar F. Codd.
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| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Relational algebra | is a | theory that uses algebraic structures for modeling data and defining queries on it with well founded semantics | 0.90 | text |
| outer joins | instance of | Joins and join-like operators Common extensionsIn practice the classical relational algebra described above is extended with various operations | 0.80 | text |
| aggregate functions | instance of | Joins and join-like operators Common extensionsIn practice the classical relational algebra described above is extended with various operations | 0.80 | text |
| even transitive closure.Outer joinsWhereas the result of a join | instance of | Joins and join-like operators Common extensionsIn practice the classical relational algebra described above is extended with various operations | 0.80 | text |
| Relational algebra | related to Common extensions | In | 0.60 | section |
| Relational algebra | related to External links | RAT Relational Algebra Translator | 0.60 | section |
| Relational algebra | related to External links | Free | 0.60 | section |
| Relational algebra | related to External links | SQLLecture Videos | 0.60 | section |
| Relational algebra | related to External links | Relational Algebra Processing | 0.60 | section |
| Relational algebra | related to External links | An | 0.60 | section |
| Relational algebra | related to Implementations | The | 0.60 | section |
| Relational algebra | related to Implementations | Codd's | 0.60 | section |
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