duplicates - mysql modify duplicated fields -

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i have table (products) duplicate products_model field . need change them new value. can select them: select * products group products_model having count(*) >=2

i need change products_model = products_model + random number

thank you

given both fields varchars job, concatenating products_model , products_id underscore

update products p1,     products p2  set      p1.products_model = concat(p1.products_model, '_', p1.products_id),     p2.products_model = concat(p2.products_model, '_', p2.products_id)     p1.products_model = p2.products_model         , p1.products_id > p2.products_id

before:

id products_model products_id 1     2     b 3   b   4   c   5   c   b

after:

id products_model products_id 1   a_a 2   a_b b 3   b   4   c_a 5   c_b b

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