We have Dell computers and I need the Service Tag (Serial Number) of the PC's. This is the report I created:
Select Top 1000000 tblAssets.AssetID,
  tsysAssetTypes.AssetTypename,
  tsysAssetTypes.AssetTypeIcon10 As icon,
  tblAssets.IPAddress,
  tblAssets.AssetUnique,
  tblAssetCustom.Serialnumber,
  tblAssetCustom.SerialnumberLock
From tblAssets
  Inner Join tblAssetCustom On tblAssets.AssetID = tblAssetCustom.AssetID
  Inner Join tsysAssetTypes On tsysAssetTypes.AssetType = tblAssets.Assettype
Where tblAssetCustom.State = 1
When I run the report the serial number field is empty. What am I doing wrong ?