How to Generate a Complete Date Range Table in SQL Server 2000 Despite Gaps in Source Data?

Generating a Temporary Date Range Table in SQL Server 2000

Your requirement to create a temporary table with dates ranging from $startDate to $endDate and additional zero-valued placeholder columns presents a challenge due to potential gaps in the customer table's insert dates.

To overcome this, consider the following approach:

1. Declare Range Variables: As you have already done, use the following declarations to capture the minimum and maximum insert dates:

   declare $startDate set $startDate = select min(InsertDate) from customer
   declare $endDate set $endDate = select max(InsertDate) from customer

2. Create a Dummy Date Table: Using the schema of your temporary table, create a dummy table with dates from $startDate to $endDate using a loop:

   CREATE TABLE #dates (
    Month DATE,
    Trials INT DEFAULT 0,
    Sales INT DEFAULT 0
   );

3. Populate Dummy Date Table: To ensure completeness, use a cursor to loop through the range of dates from $startDate to $endDate, inserting each date into the dummy table:

   DECLARE @d DATE = $startDate;
   
   WHILE @d <= $endDate
   BEGIN
    INSERT INTO #dates (Month) VALUES (@d);
    SET @d = DATEADD(DAY, 1, @d);
   END;

This approach dynamically generates a complete range of dates within the specified range, regardless of gaps in the customer table. You can then use this dummy table as the source for populating your temporary date range table.

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