Complex rolling scenario (CROSS APPLY and OUTER APPLY example) - sql

Question

I currently have data like the following (but bigger!)
/*--:::::::::::
DROP TABLE #target
DROP TABLE #Fact
*/--:::::::::::
CREATE TABLE #target
(
PlayerKey INT,
Name VARCHAR(8),
LiveKey INT
);
INSERT INTO #target
values
(1,'michael',20130103),
(2,'jackson',20130107);
CREATE TABLE #Fact
(
DateKey INT,
PlayerKey INT,
Amount INT
);
INSERT INTO #Fact
values
(20130101,1,10),
(20130102,1,90),
(20130103,1,18),
(20130103,2,79),
(20130103,3,99),
(20130104,2,15),
(20130105,1,12),
(20130105,2,15),
(20130106,1,60),
(20130107,1,96),
(20130107,2,88),
(20130107,4,28),
(20130108,1,13),
(20130108,2,15),
(20130109,1,33),
(20130109,2,67),
(20130110,1,19),
(20130110,2,17)
;
The start of the query is as follows.
DECLARE #NumDays INT = 3;
WITH basic_cte AS
(
SELECT rn = ROW_NUMBER() OVER(PARTITION BY d.Name ORDER BY f.DateKey),
f.DateKey,
d.Name,
f.Amount
FROM #Fact f
INNER JOIN #target d ON
f.PlayerKey = d.PlayerKey AND
f.DateKey >= d.LiveKey AND
f.DateKey < CONVERT(CHAR(8),CONVERT(DATETIME,CONVERT(DATETIME,CONVERT(CHAR(8),d.LiveKey,112))+#NumDays),112)
)
SELECT x.*,
"RollingAmount" = SUM(Amount) OVER(PARTITION BY Name ORDER BY DateKey)
FROM basic_cte x;
This gives the following:
Assuming that we have a DimDate production view available how do I ensure that michael has a row for 20130104 with an amount of 0?
Also is it possible in the same script, to add new columns "AmountAll" and "AmountAllRolling" which would give numbers across all the players including PlayerKeys 3 and 4? I'm guessing this would involve changing the INNER JOIN to a LEFT OUTER JOIN?
So given the above the final result would be as follows:
EDIT
via all the excellent help from Bogdan I've got the following.
I've added an extra total AmountGroup that is the total across the specified players - this was just "nice-to-have" and not part of the original specification.
DECLARE #NumDays INT = 3;
WITH basic_cte AS
(
SELECT rn = ROW_NUMBER() OVER(PARTITION BY Name ORDER BY x.DateKey),
x.DateKey,
d.Name,
Amount = ISNULL(f.Amount,0),
AmountGroup = ISNULL(f.AmountGroup,0),
AmountAll = ISNULL(f.AmountAll,0)
FROM (
SELECT t.*,
EndLiveKey = CONVERT(INT,CONVERT(CHAR(8),CONVERT(DATETIME,CONVERT(DATETIME,CONVERT(CHAR(8),t.LiveKey,112))+#NumDays),112))
FROM #target t
) d
CROSS APPLY
(
SELECT dm.DateKey
FROM WHData.dbo.vw_DimDate dm
WHERE dm.DateKey >= d.LiveKey AND
dm.DateKey < d.EndLiveKey
) x
OUTER APPLY
(
SELECT Amount = SUM(CASE WHEN PlayerKey1 = PlayerKey2 THEN fbase.Amount END),
AmountGroup = SUM(CASE WHEN inGroup = 1 THEN fbase.Amount ELSE 0 END),
AmountAll = SUM(fbase.Amount)
FROM
(
SELECT fct.Amount,
fct.PlayerKey AS PlayerKey1,
d.PlayerKey AS PlayerKey2,
CASE WHEN tt.PlayerKey IS NULL THEN 0 ELSE 1 END AS inGroup
FROM #Fact fct
LEFT OUTER JOIN #target tt ON
fct.PlayerKey = tt.PlayerKey
WHERE fct.DateKey = x.DateKey
) fbase
) f
)
SELECT y.*,
"RollingAmount" = SUM(Amount) OVER(PARTITION BY Name ORDER BY DateKey),
"RollingAmountGroup" = SUM(AmountGroup) OVER(PARTITION BY Name ORDER BY DateKey),
"RollingAmountAll" = SUM(AmountAll) OVER(PARTITION BY Name ORDER BY DateKey)
FROM basic_cte y;

Answer 1

I assume that you have a DimDate table with the following structure:
CREATE TABLE DimDate
(
DateKey INT PRIMARY KEY
);
and DateKey column doesn't has gaps.
Solution:
DECLARE #NumDays INT = 3;
WITH basic_cte AS
(
SELECT x.DateKey,
d.Name,
Amount = ISNULL(f.Amount,0)
FROM
(
SELECT t.*, CONVERT(INT,CONVERT(CHAR(8),CONVERT(DATETIME,CONVERT(DATETIME,CONVERT(CHAR(8),t.LiveKey,112))+#NumDays),112)) AS EndLiveKey
FROM #target t
) d
CROSS APPLY
(
SELECT dm.DateKey
FROM DimDate dm
WHERE dm.DateKey >= d.LiveKey
AND dm.DateKey < d.EndLiveKey
) x
LEFT OUTER JOIN #Fact f
ON f.PlayerKey = d.PlayerKey
AND f.DateKey = x.DateKey
)
SELECT rn = ROW_NUMBER() OVER(PARTITION BY Name ORDER BY DateKey),
y.*,
"RollingAmount" = SUM(Amount) OVER(PARTITION BY Name ORDER BY DateKey)
FROM basic_cte y;
Edit #1:
DECLARE #NumDays INT = 3;
WITH basic_cte AS
(
SELECT rn = ROW_NUMBER() OVER(PARTITION BY Name ORDER BY x.DateKey),
x.DateKey,
d.Name,
Amount = ISNULL(f.Amount,0),
AmountAll = ISNULL(fall.AmountAll,0)
FROM
(
SELECT t.*, CONVERT(INT,CONVERT(CHAR(8),CONVERT(DATETIME,CONVERT(DATETIME,CONVERT(CHAR(8),t.LiveKey,112))+#NumDays),112)) AS EndLiveKey
FROM #target t
) d
CROSS APPLY
(
SELECT dm.DateKey
FROM DimDate dm
WHERE dm.DateKey >= d.LiveKey
AND dm.DateKey < d.EndLiveKey
) x
OUTER APPLY
(
SELECT SUM(fct.Amount) AS Amount
FROM #Fact fct
WHERE fct.DateKey = x.DateKey
AND fct.PlayerKey = d.PlayerKey
) f
OUTER APPLY
(
SELECT SUM(fct.Amount) AS AmountAll
FROM #Fact fct
WHERE fct.DateKey = x.DateKey
) fall
)
SELECT
y.*,
"RollingAmount" = SUM(Amount) OVER(PARTITION BY Name ORDER BY DateKey),
"RollingAmountAll" = SUM(AmountAll) OVER(PARTITION BY Name ORDER BY DateKey)
FROM basic_cte y;
Edit #2:
DECLARE #NumDays INT = 3;
WITH basic_cte AS
(
SELECT rn = ROW_NUMBER() OVER(PARTITION BY Name ORDER BY x.DateKey),
x.DateKey,
d.Name,
Amount = ISNULL(f.Amount,0),
AmountAll = ISNULL(f.AmountAll,0)
FROM
(
SELECT t.*, EndLiveKey = CONVERT(INT,CONVERT(CHAR(8),CONVERT(DATETIME,CONVERT(DATETIME,CONVERT(CHAR(8),t.LiveKey,112))+#NumDays),112))
FROM #target t
) d
CROSS APPLY
(
SELECT dm.DateKey
FROM DimDate dm
WHERE dm.DateKey >= d.LiveKey
AND dm.DateKey < d.EndLiveKey
) x
OUTER APPLY
(
SELECT AmountAll = SUM(fbase.Amount),
Amount = SUM(CASE WHEN PlayerKey1 = PlayerKey2 THEN fbase.Amount END)
FROM
(
SELECT fct.Amount, fct.PlayerKey AS PlayerKey1, d.PlayerKey AS PlayerKey2
FROM #Fact fct
WHERE fct.DateKey = x.DateKey
) fbase
) f
)
SELECT
y.*,
"RollingAmount" = SUM(Amount) OVER(PARTITION BY Name ORDER BY DateKey),
"RollingAmountAll" = SUM(AmountAll) OVER(PARTITION BY Name ORDER BY DateKey)
FROM basic_cte y;