SELECT SERVER_GROUP_ID ID, GROUP_NAME VALUE from ieo_svr_groups WHERE server_group_id not in ( select nvl(group_group_id,-99999) from ieo_svr_groups )
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SELECT SERVER_GROUP_ID ID , GROUP_NAME VALUE FROM IEO_SVR_GROUPS WHERE SERVER_GROUP_ID NOT IN ( SELECT NVL(GROUP_GROUP_ID , -99999) FROM IEO_SVR_GROUPS )