UPDATE

Diagram(
  Stack(
    Sequence("UPDATE", "table-name"),
    Choice(
      0,
      Sequence(
        "SET",
        OneOrMore(
          Sequence(
            Link("field-path", "/docs/essentials/expressions/#field-path"),
            "=",
            Link("expr", "/docs/essentials/expressions")
          ),
          ","
        )
      ),
      Sequence("UNSET", OneOrMore("top-level-field", ","))
    ),
    Optional(
      Sequence("WHERE", Link("expr", "/docs/essentials/expressions")),
      "skip"
    )
  )
);