aliases are always needed when you add the same table twice; here'a i'm using an aribtrary T1 and T2;
it especially helps the query as well, as with your example, it looks like you are only selecting columns from the rxproductivity
table, so it seems like there's no value to joining to the other tables;
maybe you were going to further enhance it to get the names from the other tables?
here's my best guess, without having the tables DDL to confirm anything:
R1.whochecked AS 'userid',
T1.Name as VerifiedUser,
T2.Name as WhoCheckedUser,
COUNT (*) whochecked
FROM rxproductivity R1
JOIN users T1
ON R1.whoverified = T1.userid
JOIN users T2
ON R1.whochecked = T2.userid
COUNT(R1.whoverified) > 1
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