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SQL Recursion Question

 
Dom Lassy
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I could use some help figuring out the sql for a problem. Currently, there are 2 tables:
Domain, which has columns domainID, and parentDomainID. ParentDomainID references another Domain record.
EndUser, which has a column parentDomainID.

I have a procedure where I am looping over domainIDs (variable @currentDomainID). I need to do now is update all EndUser records that are in the currentDomainID or where the any parent of the endUser parentDomainID is the @parentDomainID.

In pseudocode what I need to do is this:

Any help would be appreciated.
 
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