For more information about the difference between named and unnamed parameters, see Binding Parameters by Name (Named Parameters) at docs.microsoft.com .

Example (Microsoft SQL Server):

CREATE FUNCTION foo(n INT, m INT) RETURNS INT AS
BEGIN
    RETURN n + m;
END;

CREATE PROCEDURE test AS
BEGIN
    foo n = 1, m = 2;

--- The following call misses parameter names and will be highlighted
    foo 1, 2;
END;

Parameters 1, 2 in the foo 1, 2; call are highlighted because they miss names.