Question

I have a table that have a Certificate # column and a Plan-Phase column, one Certificate # has multiple plan-phase values for example:

Cert #——-Plan-Phase

123———-1

123———-2

123———-4

222———-1

222———-2

333 ———- 3

I need to run a query that checks that every cert # has a plan-Phase “1” record, and return the cert # that do not have plan-Phase 1.

So my example will return cert # “333” because it has no Plan-Phase “1”.
I am working in access, I tried counting, and other combination of queries but i was unable to achieve my goal.

I bet it is pretty simple and I am just missing something.

Thank you,
Idan.

Answer 1

You could use subqueries with an outer join to find what you are looking for. Something like this:

SELECT qOther.* 
FROM 
(SELECT CertNo
FROM MyTable
WHERE PlanPhase <> 1) qOther
LEFT JOIN
(SELECT CertNo
FROM MyTable
WHERE PlanPhase = 1) qOne
ON qOther.CertNo = qOne.CertNo
WHERE qOne.CertNo IS NULL