Result that corresponds with customer and date - sql

Question

How will I get the all the date even though there is no order between two dates?
Sample Table
OrderID | Date | CusID
33942 | 6-21-2014 | 6005
34059 | 6-20-2014 | 4003
53333 | 6-23-2014 | 6005
59234 | 6-23-2014 | 4003
How I could have this result?
CusID | Date | OrderID |
4003 | 6-20-2014 | 34059 |
4003 | 6-21-2014 | null |
4003 | 6-22-2014 | null |
4003 | 6-23-2014 | 59234 |
6005 | 6-20-2014 | null |
6005 | 6-21-2014 | 33942 |
6005 | 6-22-2014 | null |
6005 | 6-23-2014 | 53333 |
This what I did so far.
I create a calendar table
CREATE TABLE #Calendar
(
[CalendarDate] DATETIME
)
DECLARE #StartDate DATETIME
DECLARE #EndDate DATETIME
SET #EndDate = GETDATE()
SET #StartDate = DATEADD(Year, -1, #EndDate)
WHILE #StartDate <= #EndDate
BEGIN
INSERT INTO #Calendar
(
CalendarDate
)
SELECT
#StartDate
SET #StartDate = DATEADD(dd, 1, #StartDate)
END
Then here is my query but does not give me the needed result
Select t.CusID, c.CalendarDate, t.OrderID
From #Calendar c
left outer join
#temp t
ON
CONVERT(VARCHAR(10), c.CalendarDate, 112) = CONVERT(VARCHAR(10), t.Date, 112)
Where c.CalendarDate Between '6-20-2014' and '6-23-2014'
Order By t.Name

Answer 1

First off, your calendar table is broken. You are using a datetime stamp, and capturing the current time stamp in your table. Better to write the correct data, than handle it later.
Two fixes for this, use a DATE format or convert your date to remove the timestamp. I chose the latter.
From there, you narrow down to the # of days being queried, and the # of customers in those days and generate a cross join of those two subsets.
DECLARE #ORDER TABLE (ORDERID INT, ordDATE DATETIME, CUSID INT)
INSERT INTO #ORDER (ORDERID, ordDATE, CUSID)
VALUES (33942,'6-21-2014', 6005),
(34059,'6-20-2014',4003),
(53333,'6-23-2014',6005),
(59234,'6-23-2014',4003)
declare #Calendar table ([CalendarDate] DATETIME)
DECLARE #StartDate DATETIME
DECLARE #EndDate DATETIME
SET #EndDate = GETDATE()
SET #StartDate = DATEADD(Year, -1, #EndDate)
WHILE #StartDate <= #EndDate
BEGIN
INSERT INTO #Calendar
(
CalendarDate
)
SELECT
CONVERT(DATETIME,FLOOR(CONVERT(FLOAT, #StartDate)))
SET #StartDate = DATEADD(dd, 1, #StartDate)
END
; with dates as
(
SELECT DISTINCT CalendarDate
FROM #Calendar
WHERE CalendarDate BETWEEN '2014-06-20' AND '2014-06-23'
),
orders as
(
SELECT DISTINCT CUSID
FROM #ORDER
WHERE ordDATE BETWEEN '2014-06-20' AND '2014-06-23'
),
cp AS
(
SELECT *
FROM dates
CROSS JOIN orders
)
SELECT cp.CUSID, cp.CalendarDate, O.ORDERID
FROM CP
LEFT OUTER JOIN #ORDER O
ON cp.CalendarDate = O.ordDATE
AND cp.CUSID = O.CUSID
If you wanted, you could move the WHERE clause outside the CTEs and into the final select statement, but the resulting cp table will be significantly larger, and slower on big datasets.

Answer 2

create the cartesian product of dates and customers and then join
with cte as
(
select caldate, custid
from calendar, customers
)
select *
from cte
left join temp o
on cte.custid = o.custid
and cast(caldate as date) = cast(orderdate as date)
where caldate between '20140620' and '20140623'