relational/test/max_rating_in_age_range.query

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(σ age<25(people) σ age>30(people)) ᐅᐊ ratings-πid,name,chief,age,rating(σ rating<r((ρid➡i,rating➡r(π id,rating((σ age<25(people) σ age>30(people)) ᐅᐊ ratings))) * (σ age<25(people) σ age>30(people)) ᐅᐊ ratings))