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I need to use a variable whose value is set in a previous stage of the data load process in a further section of the same load script.
The variable contains a date and I need to calculate the difference between its value and the dates in another field to build up a new field containing that difference. So:
Setting the value of the variable
And vMaxDate will contain the most recent date in my data table (this part works perfectly).
Using the variable
Later in the load script I'd something like (simplified example):
(vMaxDate - Registration_date) as Time_in_system,
And this is what I can't make work.
Any suggestion, guidance, comment will be highly appreciated.
Many thanks in advance.