마인드맵

<quickgv name="ER_Model" usage="er">

  // node 123456789012345678901
  A [label="<fT> user_data | <fPK> [PK] user_id\l | <f0> user_type\l | <f1>gender\l | <f2> country\l | <f3> city\l }"];
  B [label="<fT> user_type | <fPK> [PK] user_type\l | desc\l"];
  C [label="<fT> gender | <fPK> [PK] gender\l | desc\l"];

  // edges
  A:f0 -> B:fPK [label="1 .. N"];
  A:f1 -> C:fPK [label="1 .. N"];
  A:f3 -> A:f2;

</quickgv>