Question

I’m getting data from my function as follows:

Date       |   Number
06-02-2012 |    2
06-05-2012 |    5
06-08-2012 |    5

If i want to include all dates that are not found in DB in the following matter how would i do it?:

Date       |   Number
06-02-2012 |    2
06-03-2012 |    0
06-04-2012 |    0
06-05-2012 |    5
06-06-2012 |    0
06-07-2012 |    0
06-08-2012 |    5

SELECT convert(varchar, MIN(DATEADD(wk, DATEDIFF(wk, 0, person.date), 0)), 1), Count(person.ID) 
FROM [dbo].[Person] person
WHERE (DATEDIFF(D, person.date, @dateFrom) <=0 AND DATEDIFF(D, person.date, @dateTo) >=0) 
GROUP BY DATEPART(WK, person.date) 

Answer 1

I recommend that you create a table of dates — a one column table containing dates from, say 2000-01-01 to 2050-12-31. You can then use that table on the left hand side of a LEFT JOIN query like this:

SELECT date_table.date AS [Date], COUNT(your_table.primary_key) AS [Number]
FROM date_table
LEFT JOIN your_table ON date_table.date = your_table.date
WHERE date_table.date BETWEEN '2012-01-01' AND '2012-06-30'

Index the date table wisely and you’ll end up with a very efficient query.