SSIS SQL Server 2014 Data Flow's Applied Logic

I have a SSIS 2014 Package created in Visual Studio 2013. I have successfully performed a simple Data Flow from one table to another. I am now wondering how to apply additional logic: 1. Check for Existence of data, then either update or insert new data into a table's column, and 2. Avoid data duplication. Any help on coding C# or T-SQL for this small, modest task would be greatly appreciated. Thank you.
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DcpKingConnect With a Mentor Commented:
I assume here that you have already defined the criteria for Record Duplication.
To determine whether you have data to work with in the first place you can place a RowCounter component between the Source and Destination in your data flow. You will need to define an integer variable for this, and provide that variable to the RowCounter component (edit it).
After the flow completes your variable will be set to the number of records transferred. You can use the value of the variable to determine where to go next in Control Flow by having two blue ("on completion") lines from your Data Flow task. Right click them and change their properties and you should be able to edit them to have a condition, such as "User::intNrRecs > 0" for one and "User::intNrRecs != 0" for the other

For the "update or insert" operation you will be performing what is known as an "upsert" ! There are two ways of doing this with SSIS, and there's articles on each by Reza Rad linked to from here that you might find useful (I'm giving a link because they're several pages long!). The explanations are long, but the techniques aren't difficult.

Hope this helps

ladesigner2014Author Commented:
This helped a lot! Thank you!
Hi ladesigner2014
Thanks very much for answering and confirming. Very often points are awarded, but the original author never says much about how things turned out. It's great to hear that I could help you - hopefully we here at EE can help with your next problem too!

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