How Can I Efficiently Query a Database Based on Results from Another Database in SSIS?

Performing Database Queries Based on External Result Sets

In SSIS within VS 2013, you may encounter scenarios where you need to obtain a list of IDs from one database and subsequently use this list to query another database. This scenario can be addressed using various approaches.

Method 1: Using Lookup Transformation

Leverage the Lookup Transformation to retrieve specific columns from a separate table based on a matching criterion. However, this method does not filter rows but merely appends values from the second table. To filter rows based on the ID list, consider managing error outputs in the Lookup Transformation. This allows you to either ignore rows or redirect them to an error output for filtering purposes.

Method 2: Using Script Task

To avoid loading all data into memory and subsequent filtering, utilize a Script Task to construct the desired query dynamic. This approach enables you to build the WHERE IN clause with a list of IDs retrieved from the first database.

Method 3: Using Execute SQL Task

Similar to the second method, the Execute SQL Task allows you to dynamically create the IN clause using an SQL command. The resulting SQL statement can then be used as an OLEDB Source in the DataFlow Task.

It's important to note that these methods have varying performance considerations and memory consumption. Choose the most appropriate approach based on the specific requirements of your scenario and data volumes involved.

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