How to Get Missing Dates for Each Support Ticket In My Query?

Question

Hello -
I'm really baffled as to how to get missing dates for each support ticket in my query.  I did a search for this and found several CTE's however they only provide ways to find missing dates in a date table rather than missing dates for another column
in a table.  Let me explain a bit further here -
I have a query which has a list of support tickets for the month of January.  Each support ticket is supposed to be updated daily by a support rep, however that isn't happening so the business wants to know for each ticket which dates have NOT been
updated.  So, for example, I might have support ticket 44BS which was updated on 2014-01-01, 2014-01-05, 2014-01-07.  Each time the ticket is updated a new row is inserted into the table.  I need a query which will return the missing dates per
each support ticket.
I should also add that I DO NOT have any sort of admin nor write permissions to the database...none at all.  My team has tried and they won't give 'em.   So proposing a function or storable solution will not work.  I'm stuck with doing everything
in a query.
I'll try and provide some sample data as an example -
CREATE TABLE #Tickets
TicketNo VARCHAR(4)
,DateUpdated DATE
INSERT INTO #Tickets VALUES ('44BS', '2014-01-01')
INSERT INTO #Tickets VALUES ('44BS', '2014-01-05')
INSERT INTO #Tickets VALUES ('44BS', '2014-01-07')
INSERT INTO #Tickets VALUES ('32VT', '2014-01-03')
INSERT INTO #Tickets VALUES ('32VT', '2014-01-09')
INSERT INTO #Tickets VALUES ('32VT', '2014-01-11')
So for ticket 44BS, I need to return the missing dates between January 1st and January 5th, again between January 5th and January 7th.  A set-based solution would be best.
I'm sure this is easier than i'm making it.  However, after playing around for a couple of hours my head hurts and I need sleep.  If anyone can help, you'd be a job-saver :)
Thanks!!

Answer 1

CREATE TABLE #Tickets (
TicketNo VARCHAR(4)
,DateUpdated DATETIME
GO
INSERT INTO #Tickets
VALUES (
'44BS'
,'2014-01-01'
INSERT INTO #Tickets
VALUES (
'44BS'
,'2014-01-05'
INSERT INTO #Tickets
VALUES (
'44BS'
,'2014-01-07'
INSERT INTO #Tickets
VALUES (
'32VT'
,'2014-01-03'
INSERT INTO #Tickets
VALUES (
'32VT'
,'2014-01-09'
INSERT INTO #Tickets
VALUES (
'32VT'
,'2014-01-11'
GO
GO
SELECT *
FROM #Tickets
GO
GO
CREATE TABLE #tempDist (
NRow INT
,TicketNo VARCHAR(4)
,MinDate DATETIME
,MaxDate DATETIME
GO
CREATE TABLE #tempUnUserdDate (
TicketNo VARCHAR(4)
,MissDate DATETIME
GO
INSERT INTO #tempDist
SELECT Row_Number() OVER (
ORDER BY TicketNo
) AS NROw
,TicketNo
,Min(DateUpdated) AS MinDate
,MAx(DateUpdated) AS MaxDate
FROM #Tickets
GROUP BY TicketNo
SELECT *
FROM #tempDist
GO
-- Get the number of rows in the looping table
DECLARE @RowCount INT
SET @RowCount = (
SELECT COUNT(TicketNo)
FROM #tempDist
-- Declare an iterator
DECLARE @I INT
-- Initialize the iterator
SET @I = 1
-- Loop through the rows of a table @myTable
WHILE (@I <= @RowCount)
BEGIN
--  Declare variables to hold the data which we get after looping each record
DECLARE @MyDate DATETIME
DECLARE @TicketNo VARCHAR(50)
,@MinDate DATETIME
,@MaxDate DATETIME
-- Get the data from table and set to variables
SELECT @TicketNo = TicketNo
,@MinDate = MinDate
,@MaxDate = MaxDate
FROM #tempDist
WHERE NRow = @I
SET @MyDate = @MinDate
WHILE @MaxDate > @MyDate
BEGIN
IF NOT EXISTS (
SELECT *
FROM #Tickets
WHERE TicketNo = @TicketNo
AND DateUpdated = @MyDate
BEGIN
INSERT INTO #tempUnUserdDate
VALUES (
@TicketNo
,@MyDate
END
SET @MyDate = dateadd(d, 1, @MyDate)
END
SET @I = @I + 1
END
GO
SELECT *
FROM #tempUnUserdDate
GO
GO
DROP TABLE #tickets
GO
DROP TABLE #tempDist
GO
DROP TABLE #tempUnUserdDate
Thanks, 
Shridhar J Joshi 
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