CODEWITHSUNDEEP
sqldatabase
db702
db702

Reputation: 568

Adding Missing Dates From SQL Query

I am trying to add missing dates to my query so that my results look like this:

10/22/2018 15
10/21/2018 0
10/20/2018 14

Rather than this:

10/22/2018 15
10/20/2018 14

I want the past 300 days listed, even if the output value is 0.

Here is my query:

SELECT TOP (300)
    CAST(createddate as DATE),
    count(DISTINCT ID)
FROM table
GROUP BY CAST(createddate as DATE)
ORDER BY CAST(createddate as DATE) DESC

Upvotes: 0

Views: 65

Answers (1)

Gordon Linoff
Gordon Linoff

Reputation: 1269773

You can use a recursive CTE to generate the data:

WITH dates as (
      SELECT MAX(CAST(createddate as date)) as dte, 1 as lev
      FROM table
      UNION ALL
      SELECT DATEADD(day, -1, dte), lev + 1
      FROM dates
      WHERE lev < 300
     )
SELECT COUNT(DISTINCT t.ID)
FROM dates d LEFT JOIN
     table t
     ON d.dte = CAST(t.createddate as DATE)
GROUP BY d.dte
ORDER BY d.dte DESC
OPTION (MAXRECURSION 0);

Upvotes: 1

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