Sir while using SQLSERVER 2012, I have these codes

SELECT hrs,Max(reading)as reading
FROM   bin1
WHERE (CONVERT(VARCHAR(10), date, 103) = CONVERT(VARCHAR(10), GETDATE(), 103))
 AND (hrs IS NOT NULL) and updown=0 and tik is null
group by hrs
union
SELECT hrs,max(reading)as reading
FROM   bin1_empty
WHERE (CONVERT(VARCHAR(10), date, 103) = CONVERT(VARCHAR(10), GETDATE(), 103))
 AND (hrs IS NOT NULL)
group by hrs
order by hrs

It display following result


But I want to get this result


Hours from 0 to 23
Missed hours must have value 0

Please