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Under section 2.1.6, the natural join of R and S in the example is listed as being equivalent to a union between the two rather than an intersection.
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to reproduce run the following with model checking activated (`--aggressive-model-checking`)
~~~
Q(X) :- R(X,X). ANS : Q. WHY(Q(1)) FORMAT REDUCED_GP. TOP 3 SUMMARIZED BY LCA WITH SAMPLE(3).
~~~…
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In our course, we use the theta-join (θ-join) operator: https://en.wikipedia.org/wiki/Relational_algebra#%CE%B8-join_and_equijoin
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In early 2014, before I got distracted by a chain of full time consulting projects, I was working on developing a simple, flexible pivot table for the browser.
A key idea in this project was that t…
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Consider `a > 0` and `b > 0` then `a/(a+b)` is between 0 and 1, however this, to sympy, is more or less obvious, depending on how we manipulate the expression:
![image](https://github.com/sympy/sym…
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[JuliaTS](https://github.com/tanmaykm/JuliaTS.jl) (time series and relational algebra operations over [NDSparseData](https://github.com/JuliaComputing/NDSparseData.jl)) support may also be considered …
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Correspondingly, enrich the variable operator to allow multiple requests of recursive structures. This will make the structures of descriptions and ornaments more uniform. Hopefully, better theoretica…
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Hello,
https://github.com/tanmaykm/JuliaTS.jl implemented some time series and relational algebra operations over NDSparseData.
I wonder if there is some efforts in this direction.
Kind regar…
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- [x] fix the logical issue: we cannot just push down the choices as we want, instead we need to have optimization rules which are the combination of choice calculus optimization rules and relational …
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As requested in #656, it would be nice if PRQL could provide `intersect` and `difference` operators along with the `union` operator.
`intersect` and `difference` can be achieved with `semi joins` a…
snth updated
11 months ago