How do I find matches to update in SQL when inner join or join says there are no matches?

Member 11856456 asked:

I am working with the SSDI released in 2013 and another death record. However, when trying to see how many records match by SSN I am getting zero results returned. Here is the code that I am using:

select allcalSSNs.Last_name,allcalSSNs.First_name,allcalSSNs.ssn from ssdm JOIN allcalSSNs ON allcalSSNs.SSN = ssdm.ssn

I have even tried a sub select when also returned zero results.

I have never ran into this issue before with any table I have tried this on.

there are approximately 9,000,000 records in the allcalSSNs and there are about 91,000,000 in the SSDI.

I could really use some guidance on this since I know there are some examples that should be in both.

What I have tried:

Already stated in above sentence: both sub select and inner join/join method.

Tags: SQL

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