1 row where subshape = "empty diagram"

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Link subshape shape
empty diagram point

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CREATE TABLE "full_subdiagrams" (
	"subshape"	TEXT NOT NULL,
	"shape"	TEXT NOT NULL,
	FOREIGN KEY("subshape") REFERENCES "diagrams"("shape") on update cascade on delete restrict,
	FOREIGN KEY("shape") REFERENCES "diagrams"("shape") on update cascade on delete restrict,
	PRIMARY KEY("subshape","shape")
);