Can the SSIS look up function be used for complex join or lookup?


I have used tsql join in my ETL transformation, due to complexity and easy maintainence of my ETL script. I understand that SSIS look up function is good in terms of lookup for surrogate key from dimension table.

However, I got complex business rule where I had to translate my lookup table with customize view such as use of select statement to filter the row I need.

What is the best approach in terms lookup tsql or SSIS?

Thanks in advance
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Jason Yousef, MSSr. BI  DeveloperCommented:
From my experience, just use the SSIS lookup, when you really need to, otherwise relay on the SQL engine to do the join and lookup for you.

Anyway The lookup in SSIS has 3 modes,

1-no cache  -- slower not case sensitive
2-Partial cache - case sensitive, will cache your values as it match.
3-Full cache   - case sensitive  - Faster - will cache your lookup table upfront.

You might also restrict the cache size if you'll use partial or full modes.. read this article about lookups...

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