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relational/test/max_rating_in_age_range.query

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Change relational language to use math symbols The symbols previously used were a Canadian script, and were looking good enough, but they might not be installed in every machine. Besides, all this is to workaround a Qt5 bug that prevents from rendering those symbols at times.
2015-05-31 12:01:03 +07:00
(σ age<25(people) ∪ σ age>30(people)) ⋈ ratings-πid,name,chief,age,rating(σ rating<r((ρid➡i,rating➡r(π id,rating((σ age<25(people) ∪ σ age>30(people)) ⋈ ratings))) * (σ age<25(people) ∪ σ age>30(people)) ⋈ ratings))