Question

I have a table and every row will have an ID, Date, and Value column. I want it so that every time a person accesses a page on my web site, a stored procedure will run that will insert a row for each day within a range IF that day doesn’t already exist.

The date range will be from 01/01/2012 until the Saturday before the current day (the day the page was accessed). The ID will auto-generate and the Value field will remain NULL/blank.

For example, if I accessed the page today, I would want a record in the table for every day between 01/01/2012 until 03/03/2012.

Answer 1

This gets all the days that don’t exist yet, and excludes rows after the previous Saturday.

;WITH d AS 
(
  SELECT TOP (366) d = DATEADD(DAY, ROW_NUMBER() OVER (ORDER BY object_id), '20111231')
  FROM sys.all_objects
)
INSERT dbo.[a table]([Date])
  SELECT d FROM d 
  WHERE d NOT IN (SELECT [Date] FROM dbo.[a table])
  AND d <= DATEADD(DAY, 0-DATEPART(WEEKDAY, GETDATE()), GETDATE());

Note that I assumed you would “reset” this once your calendar year rolled over.