SQL syntax for querying AD group membership

I’ve established a connection to Active Directory through Crystal Reports. Now I need to write an SQL select statement to return all computer accounts and their group memberships. My statement returns all the computer accounts in the target OU, but the MemberOf field is empty. I’ve included below my query statement and would welcome any suggestions…
*******************************************
Select CN, memberOf
From ‘LDAP://OU=Managed Accounts, OU=Central Valley Service Area, DC= root, DC=sutterhealth, DC=org’
where ObjectClass=’computer’
*********************************************