Do I need to create a 2-column key in a manyTomay table?

This manyTomany table has tableAid and tableBid.  Should I or do I need to make a PK out of these 2 columns?  Thank you.
lapuccaAsked:
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bitrefConnect With a Mentor Commented:
You should, so that you guarantee a unique combination of both keys.
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lapuccaAuthor Commented:
Thanks.
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