Have the Explode command already,Is it necessary to have the UnjoinEdge command?
Yes. The two do different things. Explode explodes (unjoins) the entire object, UnjoinEdge allows you to select edges individually to unjoin while leaving the rest joined.
If I explode the entire object, select parts that I want to keep then jion them, is that same effect with the JoinEdge command？
Explode works on an entire object. Join can work on a collection of preselected objects or with post-selection, it can join things one-by-one. In both cases you are selecting objects - curves or surfaces/polysurfaces.
JoinEdge and its inverse UnjoinEdge work on individual edges of surface/polysurface objects, not the entire object.
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Thank you.