subcategories
2 rows where parent = "RT(K₂)"
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CREATE TABLE "subcategories" (
"subcategory" TEXT NOT NULL,
"parent" TEXT NOT NULL,
FOREIGN KEY("parent") REFERENCES "categories"("name") on update cascade on delete restrict,
FOREIGN KEY("subcategory") REFERENCES "categories"("name") on update cascade on delete restrict,
PRIMARY KEY("subcategory","parent")
);