select  num1 ,num2 ,num3,sum(num1+num2+num3) from (
	SELECT
		(SELECT count(0) FROM com_news) AS num1,
		(
			SELECT
				count(0)
			FROM
				plat_news
		) AS num2,
		(
			SELECT
				count(0)
			FROM
				police_news
		) AS num3
	FROM
		DUAL
) as  total;