SQL Query to return 24 hour, hourly count even when no values exist?

Question

I\'ve written a query that groups the number of rows per hour, based on a given date range.

SELECT CONVERT(VARCHAR(8),TransactionTime,101) + \' \' + CONVERT(         


        

Answer 1

group by datepart('hour', thetime). to show those hours with no values you'd have to left join a table of times against the grouping (coalesce(transaction.amount, 0))