CREATE TABLE "User" (
	"name" varchar(255),
	"id" int PRIMARY KEY
);
CREATE TABLE "Class" (
	"id" int PRIMARY KEY
);
CREATE TABLE "UserClassMapping" (
	"userid" int,
	"classid" int,
	FOREIGN KEY("userid") REFERENCES "User" ("id"),
	FOREIGN KEY("classid") REFERENCES "Class" ("id")
);