Show Dates that have no values for selected column - sql

Question

I have the following query which counts the number of items created on a particular date in the last 10 days
SELECT
CONVERT (DATE, CreatedDate_6258638D_B885_AB3C_E316_D00782B8F688) AS 'Logged Date',
Count (*) AS 'Total'
FROM
MTV_System$WorkItem$Incident
WHERE
CreatedDate_6258638D_B885_AB3C_E316_D00782B8F688 >= DATEADD(DAY, DATEDIFF(DAY, 0, Getdate()) - 10, 0)
GROUP BY
CONVERT(DATE, CreatedDate_6258638D_B885_AB3C_E316_D00782B8F688)
How do I get this to show the dates which have no values present (i.e. get every date value for the last 10 days, return the count if there is data or 0 if none). Using SQL Server 2012.

Answer 1

You can write a recursive cte to get the date for the last 10 days into a table as follows:
WITH TableA (StartDate) AS (SELECT DATEADD(DAY, DATEDIFF(DAY, 0, Getdate()) - 10, 0)),
q as (
SELECT StartDate
, Number = 0
FROM TableA
UNION ALL
SELECT DATEADD(d,1,StartDate)
, Number = Number + 1
FROM q
WHERE 10 > Number )
Then join q with your original query, to get a row for every date.
select q.StartDate, yourtable.Total from q
left join (
SELECT
CONVERT (DATE, CreatedDate_6258638D_B885_AB3C_E316_D00782B8F688) AS 'Logged Date',
Count (*) AS 'Total'
FROM
MTV_System$WorkItem$Incident
WHERE
CreatedDate_6258638D_B885_AB3C_E316_D00782B8F688 >= DATEADD(DAY, DATEDIFF(DAY, 0, Getdate()) - 10, 0)
GROUP BY
CONVERT(DATE, CreatedDate_6258638D_B885_AB3C_E316_D00782B8F688)
) as yourtable on [Logged Date] = q.StartDate

Answer 2

Similar to BeanFrog's answer but a little shorter
-- sample data for testing
declare #MTV_System$WorkItemIncident table (
[CreatedDate_6258638D_B885_AB3C_E316_D00782B8F688] DATE,
[Total] INT
);
INSERT INTO #MTV_System$WorkItemIncident VALUES ('2015-11-23', 23);
INSERT INTO #MTV_System$WorkItemIncident VALUES ('2015-11-21', 21);
INSERT INTO #MTV_System$WorkItemIncident VALUES ('2015-11-30', 30);
-- now the query
WITH TableA (LoggedDate) AS (
SELECT TOP 10 CONVERT (DATE, DATEADD(DAY, number * -1, GETDATE())) AS 'LoggedDate'
FROM master.dbo.spt_values
WHERE name IS NULL
)
SELECT TableA.[LoggedDate],
SUM(ISNULL(Data.Total, 0)) AS 'LoggedCount'
FROM TableA
LEFT JOIN #MTV_System$WorkItemIncident AS Data ON CONVERT (DATE, CreatedDate_6258638D_B885_AB3C_E316_D00782B8F688) = TableA.[LoggedDate]
GROUP BY TableA.[LoggedDate]

Answer 3

Not that there is anything wrong with BeanFrog's answer, but if you don't want to use a recursive cte you could do this:
CREATE TABLE MTV_System$WorkItem$Incident (id int PRIMARY KEY, CreatedDate_6258638D_B885_AB3C_E316_D00782B8F688 datetime)
INSERT INTO MTV_System$WorkItem$Incident VALUES (1, '20151201')
INSERT INTO MTV_System$WorkItem$Incident VALUES (2, '20151126')
INSERT INTO MTV_System$WorkItem$Incident VALUES (3, '20151127')
INSERT INTO MTV_System$WorkItem$Incident VALUES (4, '20151127')
SELECT
ReportDate AS 'Logged Date',
Count (CreatedDate_6258638D_B885_AB3C_E316_D00782B8F688) AS 'Total'
FROM (
SELECT DATEADD(DAY, DATEDIFF(DAY, 0, Getdate()) - 0, 0) AS ReportDate
UNION SELECT DATEADD(DAY, DATEDIFF(DAY, 0, Getdate()) - 1, 0)
UNION SELECT DATEADD(DAY, DATEDIFF(DAY, 0, Getdate()) - 2, 0)
UNION SELECT DATEADD(DAY, DATEDIFF(DAY, 0, Getdate()) - 3, 0)
UNION SELECT DATEADD(DAY, DATEDIFF(DAY, 0, Getdate()) - 4, 0)
UNION SELECT DATEADD(DAY, DATEDIFF(DAY, 0, Getdate()) - 5, 0)
UNION SELECT DATEADD(DAY, DATEDIFF(DAY, 0, Getdate()) - 6, 0)
UNION SELECT DATEADD(DAY, DATEDIFF(DAY, 0, Getdate()) - 7, 0)
UNION SELECT DATEADD(DAY, DATEDIFF(DAY, 0, Getdate()) - 8, 0)
UNION SELECT DATEADD(DAY, DATEDIFF(DAY, 0, Getdate()) - 9, 0)
UNION SELECT DATEADD(DAY, DATEDIFF(DAY, 0, Getdate()) - 10, 0)
) AS Dates
LEFT JOIN MTV_System$WorkItem$Incident ON ReportDate = CONVERT(DATE, CreatedDate_6258638D_B885_AB3C_E316_D00782B8F688)
GROUP BY ReportDate
BeanFrog's answer has the advantage of being able to easily change the number of days though.