which entities(in given question) could make M:M relationship

I had this question after viewing Normalization to 3NF; shopping cart data.which entities(in given question) could  make  M:M  relationship
noor hayaAsked:
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nociSoftware EngineerCommented:
Can you describe how a N:M relationship is implemented?...
Raja Jegan RSQL Server DBA & Architect, EE Solution GuideCommented:
I don't see an Order details table in your design, if it is available, then you can have M:M relationship between Order details and Products like one order can have Multiple products or one product across multiple orders making it a M:M relationship..
Without Order details table, I guess you can have 1:M relationships only..

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nociSoftware EngineerCommented:
N:M relations are already given away: the Cart f.e.   User & Products in the cart. Users can have many products, Products can have many users.
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