SQL查询 - 除非声明，否则忽略空值

Question

我需要SQL查询的帮助。我正在查询我的活动目录，我需要忽略所有将其manager字段设置为null的对象，除非该对象具有某个名称。我不太确定如何执行我需要的UNLESS声明。以下是我到目前为止的情况：

SELECT     distinguishedName AS UniqueId,
           department,
           Title, 
           Manager AS ManagerId,
           displayName AS Name, 
           mail AS Email,
           thumbnailphoto AS photo
 FROM OPENQUERY(ADSI,'SELECT mail,
                             CN,
                             distinguishedName,
                             Manager, 
                             displayName, 
                             Title,
                             department,
                             thumbnailphoto FROM                 
                             ''LDAP://internal.mesacounty.us'
                                  'WHERE objectCategory=''Person'' AND   
                                   objectClass = ''User''') AS derivedtbl_1
     WHERE     (Manager IS NOT NULL ***UNLESS DisplayName = ''WHATEVER NAME I CHOOSE'')

Answer 1

用UNLESS替换OR应该这样做。