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Achilles - Associated Analysis SQL vs Associated Heel SQL


I was trying to Run Achilles on our dataset and have few questions.

May I check with you on what’s the difference between Associated Analysis SQL and Associated Heel SQL?

While I understand that Achilles Heel is a component of Achilles and makes use of precomputed info from it run the rule-based checks.

I understand that these SQL could be used to debug/locate the records by querying in the db.

But why two different SQLs. While some have both the SQL and some items only have Heel SQL

Can someone guide us on this?