Question

I have a situation where a query might be called multiple times from multiple users, but I only want it to run once (per week) against the database. The environment is SQL Server Express so scheduling via SQL Server Agent is not an option. It needs to be 2005 compatible. I’d like to make it as lightweight as possible too, so I’m asking for suggestions. Ideally a database wide declared variable – but I don’t think that SQL Server supports such a beast? Thanks

Answer 1

Try something like this:

IF NOT EXISTS ( -- Check if you have the current week content
    SELECT  * 
    FROM    WeeklyTable 
    WHERE 
            DATEPART(YEAR, DateCr) = DATEPART(YEAR, GETDATE())
            AND
            DATEPART(WEEK, DateCr) = DATEPART(WEEK, GETDATE())
  )
BEGIN 
   -- delete old content
  DELETE WeeklyTable
   -- insert new content
  INSERT INTO WeeklyTable (MyID, MyField1, ... , MyFieldN, DateCr)
    SELECT 
      MyID, MyField1, MyField2, GETDATE()
    FROM MainTable
END

You can create indexes you need for the WeeklyTable.