Oracle Concept for version,patch,patchset for version major minor and upgrade

** Myself

<Version>.<patch>.<patchset>   -> 10.2.0.4
10.2.0.1 to 10.2.0.4 change minor patchset by (runInstaller in patchset Disk catpatch.sql/utlrp.sql)
10.1 to 10.2 change major patch (Upgrade use dbua tools)
9.2 to 10.2 change version upgrade(Upgrade use dbua tools)