How to Display All Dates in a Range and Fill Missing Values with Zero Using SQL?

Developing a Query to Display All Dates and Fill Missing Values with Zero

When working with date ranges, it often becomes necessary to account for missing data points. This comprehensive guide provides a solution to the problem of displaying all dates between two given dates and assigning zero values to missing rows.

To address this issue, we can leverage a common table expression (CTE) named "d". This CTE generates a series of dates within the specified range. We can then perform a left join between the CTE and the original "temp" table to obtain the desired result.

Here's the modified query:

;with d(date) as (
  select cast('10/01/2012' as datetime)
  union all
  select date+1
  from d
  where date < '10/15/2012'
  )
select t.ID, d.date CDate, isnull(t.val, 0) val
from d
left join temp t
       on t.CDate = d.date
order by d.date
OPTION (MAXRECURSION 0) -- use this if your dates are >99 days apart

This revised query ensures that all missing dates are captured, and the corresponding "val" column is populated with zeros. The "OPTION (MAXRECURSION 0)" statement is added to handle situations where the date range exceeds 99 days.

The above is the detailed content of How to Display All Dates in a Range and Fill Missing Values with Zero Using SQL?. For more information, please follow other related articles on the PHP Chinese website!