Query to list the hardware and software inventory dates of all the SCCM clients.

SELECT DISTINCT SYS.Netbios_Name0, SYS.Operating_System_Name_and0,
  HWSCAN.LastHWScan, SWSCAN.LastScanDate, SWSCAN.LastCollectedFileScanDate 
FROM v_R_System SYS
LEFT JOIN v_GS_LastSoftwareScan SWSCAN on SYS.ResourceID = SWSCAN.ResourceID
LEFT JOIN v_GS_WORKSTATION_STATUS HWSCAN on SYS.ResourceID = HWSCAN.ResourceID