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I have a table like this:

Column A    Column B
-------------------------
Agent A     abc@gmail.com
Agent B     abc@gmail.com
Agent A     abc@gmail.com
Agent B     def@gmail.com 
Agent C     efg@gmail.com

I want to see results where the same email address exists for Agents A and B.

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Something like this:

select a.columna, a.email
from (select * from tablename where columna='A') a
join (select * from tablename where columna='B') b
on (a.columnB=b.ColumnB)

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