select products where problem belongs any problem hierarchy


i have products list contains fk category, categories list combined proceed any problem have progenitor category, example:



computers
    processors
        intel
            pentium
            core 2 duo
        amd
            athlon


i need name query comparison problem processors, relapse products intel, pentium, core 2 duo, amd, etc...



i guess formulating arrange "cache" store categories hierarchy each problem db consolidate "in" where clause. best solution?



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