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select * from alf_node_properties np left join alf_content_data cd on (cd.id = np.long_value) where 
np.actual_type_n = 21 and cd.id is null;

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  • 1. select * from alf_node_properties np left join alf_content_data cd on (cd.id = np.long_value) where np.actual_type_n = 21 and cd.id is null;