How To Convert SELECT Into UPDATE SQL Statement

Hello!

I am trying to write an update t-SQL statement from the following select statement:

SELECT EduNextContacts.ssn
FROM EduNextContacts Left JOIN
EduContactsAuditChanges ON EduNextContacts.ssn = EduContactsAuditChanges.ssn AND
EduNextContacts.campaign_code = EduContactsAuditChanges.campaign_code
GROUP BY EduNextContacts.ssn
HAVING(SUM(CASE EduContactsAuditChanges.release_code WHEN '103' THEN 1 ELSE 0 END) +
SUM(CASE EduContactsAuditChanges.release_code WHEN '102' THEN 1 ELSE 0 END) >= 2)

I tried many versions of writing my update statement with no luck. My most recent version is as follows:


UPDATE EduNextContacts

SET EduNextContacts.overLMLimit = 'Y'

FROM EduNextContacts Left JOIN

EduContactsAuditChanges ON EduNextContacts.ssn = EduContactsAuditChanges.ssn AND

EduNextContacts.campaign_code = EduContactsAuditChanges.campaign_code

WHERE EduNextContacts.ssn = (SELECT DISTINCT EduContactsAuditChanges.ssn

FROM EduNextContacts Left JOIN

EduContactsAuditChanges ON EduNextContacts.ssn = EduContactsAuditChanges.ssn AND

EduNextContacts.campaign_code = EduContactsAuditChanges.campaign_code

GROUP BY EduContactsAuditChanges.ssn

HAVING(SUM(CASE EduContactsAuditChanges.release_code WHEN '103' THEN 1 ELSE 0 END) +

SUM(CASE EduContactsAuditChanges.release_code WHEN '102' THEN 1 ELSE 0 END) >= 2))


And gives the following error:

Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.


Can anyone help shed some light on how to make an update statement from my SELECT query above?

Thanks in advance,
Harry