Forum Discussion
Calculate Earliest Order Date and Subtracting from Create Date
Hello,
I have customers with their "individual" create dates in one table and "multiple" order dates in another table linked using customer id. I have to calculate the "earliest/first order" date and then subtract it from the "create date" for each indicvidual customer to get the number of days between.
Please help. Thanks!
The simplest solution would be to add a calculated column to the 'Customers' table.
DaysUntilFirstOrder = VAR CustomerFirstOrderDate = CALCULATE( MIN('Orders'[Order Date]) ) RETURN DATEDIFF( 'Customers'[Create Date]; CustomerFirstOrderDate; DAY )This formula assumes a relationship between 'Customers' and 'Orders' table.
The CALCULATE statement enforces that the first order date is found in the context of a single customers. Without CALCULATE the formula would find the first order for ANY customer.
Be aware that DATEDIFF can return an error if any order date found is less that the corresponding 'Customers'[Create Date]. Such an exception can be handled using IFERROR() - but this can have negative performance impact at processing time.
2 Replies
- clausm73
Advocate II
The simplest solution would be to add a calculated column to the 'Customers' table.
DaysUntilFirstOrder = VAR CustomerFirstOrderDate = CALCULATE( MIN('Orders'[Order Date]) ) RETURN DATEDIFF( 'Customers'[Create Date]; CustomerFirstOrderDate; DAY )This formula assumes a relationship between 'Customers' and 'Orders' table.
The CALCULATE statement enforces that the first order date is found in the context of a single customers. Without CALCULATE the formula would find the first order for ANY customer.
Be aware that DATEDIFF can return an error if any order date found is less that the corresponding 'Customers'[Create Date]. Such an exception can be handled using IFERROR() - but this can have negative performance impact at processing time.
