Defining a Variable in Data Flow

Question

Hello, all.
I'm in the process of relearning SSIS after a year-long hiatus and I was in the process of learning back then.
I'm trying to streamline a SQL stored procedure and I need to define a variable for use in a Derived Column task. Unfortunately, I haven't a clue how to do it. I've searched online, but I've yet to find anything that gels into something clear in my head.
Anyway, the variable definition is;
DECLARE @PreviousInputDate DATETIME
SELECT
@PreviousInputDate = Max([Input Date])
FROM
Staging2
I need to create the variable so that its scope includes all tasks in the data flow.
I'll keep digging around, but thanx in advance for any help!

Answer 1

You can create the variable at data flow scope. Select data flow task (dont double click!) and click on variables in menu to open variables window on left. Then create your new variable. use it in ResultSet tab of above execute sql task after setting ResultSet
option to Single Row. The  sql statement can just be this
SELECT
PreviousInputDate = Max([Input Date])
FROM
Staging2
Then in resultset tab map PreviousInputDate  to your variable.
Then inside derived column you can fetch it from variables collection like below.
Just drag the variable to expression area to access it
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