Fill In The Date Gaps With Date Table

Question

I have two tables.

An orders table with customer, and date. A date dimension table from a data warehouse.

The orders table does not contain activity for ev

Answer 1

Here is a simple way to do it:

SELECT  A.Customer,
        B.fulldate [Date],
        ISNULL(C.Amount,0) Amount
FROM (  SELECT  Customer, 
                MIN([Date]) MinDate,
                MAX([Date]) MaxDate
        FROM Orders
        GROUP BY Customer) A
LEFT JOIN DateTable B
    ON B.fulldate BETWEEN A.MinDate AND A.MaxDate
LEFT JOIN Orders C
    ON A.Customer = C.Customer 
    AND B.fulldate = C.[Date]