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See e.g. https://turingmachine.org/courses/2007/saved.csc370S07/lectures/04_rel-algebra2.pdf
This alternative results in duplicates not being eliminated e.g. by projection. The union, intersection, …
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See https://github.com/jump-dev/JuMP.jl/issues/3438, specifically https://jump.dev/JuMP.jl/stable/tutorials/linear/multi_commodity_network/ is mentioned. It'd be good to get an acsets implementation.
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### Description
The first time I saw π and σ in a graph viz (dot) e.g. https://pola.rs/_astro/optimized.e46e3f3c_ZSiab5.svg I was confused as what they meant. In the text (https://pola.rs/posts/polar…
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# SQL 与关系代数
[https://rgb-24bit.github.io/blog/2019/sql-relational-algebra.html](https://rgb-24bit.github.io/blog/2019/sql-relational-algebra.html)
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Motivated by https://jump.dev/2023/07/20/gams-blog/
To make this syntax a bit nicer
odow updated
9 months ago
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Print the query plan as relational algebra expression and allow executing multiple query plans.
vogti updated
2 years ago
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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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Hi,
Thanks for your work on this package, it's super nice and fast! May be I missed it , but is there somewhere I can access the SQL statement that is being executed on duckdb ? Explain() provides…
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Hi ,
I'm struggling with Quiz of the DB4 - Relational Algebra mini course. I'm fine working out how to query, but actually writing it down in that silly RA language is getting me down.
Can someone pl…
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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).
~~~…