CREATE OR ALTER PROCEDURE usp_CreateUserAccount(
    @UserAccountId UNIQUEIDENTIFIER OUTPUT,
    @Username VARCHAR(64),
    @FirstName NVARCHAR(128),
    @LastName NVARCHAR(128),
    @DateOfBirth DATETIME,
    @Email VARCHAR(128)
)
AS
BEGIN
    SET
        NOCOUNT ON;

    DECLARE
        @Inserted TABLE
                  (
                      UserAccountID UNIQUEIDENTIFIER
                  );

    INSERT INTO UserAccount
    (Username,
     FirstName,
     LastName,
     DateOfBirth,
     Email)
    OUTPUT INSERTED.UserAccountID INTO @Inserted
    VALUES (@Username, @FirstName, @LastName, @DateOfBirth, @Email);

    SELECT @UserAccountId = UserAccountID
    FROM @Inserted;
END;