opposite_categories
1 row where category = "CompBoolAlg"
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CREATE TABLE "opposite_categories" ( "category" TEXT NOT NULL UNIQUE, "op" TEXT NOT NULL CHECK("category" <= "op") UNIQUE, FOREIGN KEY("category") REFERENCES "categories"("name") on delete restrict on update cascade, PRIMARY KEY("category","op"), FOREIGN KEY("op") REFERENCES "categories"("name") on delete restrict on update cascade );