opposite_categories

1 row where op = "Rel"

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Link category op
Rel,Rel Rel Rel

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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
);