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N → M ( Many to Many )

Product

ID 10

content text

ID 11

content text2

ID 11

content text3

Tag

ID 1

Tag 'new'

ID 2

Tag 'promo'

ID 1

Tag 'new'

ID 2

Tag 'promo'

product_tag

ID 1

Tag 'new'

product_id 10

tag_id 1

product_id 10

tag_id 2