How to identify duplicates in data using SQL

Question

Here's my scenario, I am querying a salesforce database and I have certain cases which have different case_id's but the content remains the same. ie the case description, case owner, case assigned team and all other related information are the same.

I can do a self join to identify such cases but my question to all you SQL gurus is - can this be done without using joins? The reason being, all these information is housed in different tables and makes things harder to do a self join?

Answer 1

Try:

SELECT COUNT(CASE_ID), CaseDescription, CaseOwner, CaseAssignedTeam, ...

FROM Table

GROUP BY CaseDescription, CaseOwner, CaseAssignedTeam, ...

HAVING COUNT(CASE_ID)>1