Filling empty dates with stored procedure in sql - sql

Question

I have found similar questions that have been answered but I can't seem to get it working. I have the following SQL query but I want to fill the missing dates with 0-values
SELECT
Lines.Item,
CAST(Lines.Date AS Date) AS SalesDate,
ABS(SUM(Lines.Invoiced)) AS QtySoldOnDate
FROM
Lines
WHERE
Lines.Invoiced < 0
AND Lines.Item = 'a158wa'
AND Lines.Date >= '2014-01-01'
AND Lines.Date <= '2014-12-31'
GROUP BY
Lines.Item, Lines.Date
I have found the following post, but I can't seem to get it working/figure out how to merge the two queries: What is the most straightforward way to pad empty dates in sql results (on either mysql or perl end)?
Any help would be greatly appreciated.

Answer 1

The easiest way is to get a list of 365 values for forming the dates. One way is with master..spt_values, something like this:
with dates as (
select dateadd(day, row_number() over (order by (select null)),
cast('2014-01-01' as date)) as thedate
from master..spt_values
)
SELECT l.Item, d.thedate AS SalesDate,
ABS(SUM(l.Invoiced)) AS QtySoldOnDate
FROM dates d left join
Lines l
ON l.Date = d.thedate and
l.Invoiced < 0 AND
l.Item = 'a158wa'
WHERE d.thedate BETWEEN '2014-01-01' AND Lines.Date <= '2014-12-31'
GROUP BY l.Item, d.theDate;
Note: You can also read the Number column directly from master..spt_values if you use type = 'P'. I'm likely to forget the type part, so I just used row_number(). Perhaps Microsoft could add a view called Numbers that did this for us.

Answer 2

You can Create storedprocedure with 2 input parameters and 1 output parameters
and you can check if row exists then do your job and in the else part you can set output parameter as o-values
CREATE PROCEDURE yourprocedure
#startDate Date,
#endDate Date,
#OutputPara as nvarchar(100) output
AS
BEGIN
IF EXISTS( Select Lines.Item FROM Lines [Lines.Date] Where [Lines.Date] >= #startDate AND [Lines.Date] <= #endDate)
BEGIN
SELECT
Lines.Item,
COALESCE(CAST(Lines.Date AS Date),'0') AS SalesDate,
ABS(SUM(Lines.Invoiced)) AS QtySoldOnDate
FROM
Lines
WHERE
Lines.Invoiced < 0
AND Lines.Item = 'a158wa'
AND [Lines.Date] >= #startDate
AND [Lines.Date] <= #endDate
GROUP BY
Lines.Item, [Lines.Date]
Set #OutputPara =' result exists'
END
ELSE
BEGIN
SET #OutputPara='0-results';
END
END
GO

Answer 3

I'm assuming you want the days where nothing is sold, to have its own row with 0 as it's value. This should do it perhaps with a few tweaks from you since I don't have your table or any data.
DECLARE #startDate DATE,
#endDate DATE;
SET #startDate = '2014-01-01';
SET #endDate = '2014-12-31';
--Generates table of each day in range
WITH cte_dates
AS
(
SELECT #startDate AS startDate
UNION ALL
SELECT DATEADD(DAY,1,startDate)
FROM cte_dates
WHERE startDate <= #endDate
)
SELECT cte_dates.startDate,
Lines.Item,
CAST([Lines.Date] AS Date) AS SalesDate,
ISNULL(ABS(SUM(Lines.Invoiced)),0) AS QtySoldOnDate
FROM cte_dates
--Left join makes it where if there is no date in Lines, then cte_dates will be there with nulls for columns in your table Lines
LEFT JOIN Lines
ON cte_dates.startDate = Lines.[Date]
WHERE
Lines.Invoiced < 0
AND Lines.Item = 'a158wa'
AND Lines.Date BETWEEN #startDate AND #endDate
GROUP BY Lines.Item,Lines.[Date],cte_dates.startDate
--It's a recursive CTE. This allows it recursively iterate enough times to generate the list of dates
OPTION (MAXRECURSION 0)
Theoretical results:
StartDate Item SalesDate QtySOldOnDate
---------------------------------------------------
2014-01-01 Item1 2014-01-01 500
2014-01-02 NULL NULL 0
2014-01-03 Item2 2014-01-03 250