Hello dasja02,
I see several request of building queries, I will suggest you to have a look at the reference documentation for the related data dictionary.
This is a multi-relation using a cross over table that maintain the relations (usp_lrel_asset_chgnr)
Then you will have to link the chg table and the ca_owned_resource trough this table to retrieve the info you need
Below is a example on how to build such query:
SELECT chg.chg_ref_num, ca_owned_resource.resource_name
FROM ca_owned_resource INNER JOIN
usp_lrel_asset_chgnr ON ca_owned_resource.own_resource_uuid = usp_lrel_asset_chgnr.nr RIGHT OUTER JOIN
chg ON usp_lrel_asset_chgnr.chg = chg.id
You will need to apply same technics for workflow task or others multi relation link.
Hope this help
/J