python - Update a increasing value by MySQL -

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i have table in mysql, data this:

+-----------+--------------------------------------+-------+ | address   | subnet_id                            | major | +-----------+--------------------------------------+-------+ | 2.2.2.2   | 7ec1f191-476d-46cd-8fc9-0a8d24dfb8e9 |     0 | | 7.7.7.7   | 7ec1f191-476d-46cd-8fc9-0a8d24dfb8e9 |     0 | | 1.1.1.1   | 7ec1f191-476d-46cd-8fc9-0a8d24dfb8e9 |     0 | | 3.3.3.3   | 7ec1f191-476d-46cd-8fc9-0a8d24dfb8e9 |     0 | | 4.4.4.4   | 7ec1f191-476d-46cd-8fc9-0a8d24dfb8e9 |     0 | | 9.99.9.10 | 7ec1f191-476d-46cd-8fc9-0a8d24dfb8e9 |     0 | +-----------+--------------------------------------+-------+

i need update major column increasing number (from 0 1, 2, 3...) . example, update subnet_id equals'7ec1f191-476d-46cd-8fc9-0a8d24dfb8e9'. result should this:

+-----------+--------------------------------------+-------+ | address   | subnet_id                            | major | +-----------+--------------------------------------+-------+ | 2.2.2.2   | 7ec1f191-476d-46cd-8fc9-0a8d24dfb8e9 |     0 | | 7.7.7.7   | 7ec1f191-476d-46cd-8fc9-0a8d24dfb8e9 |     1 | | 1.1.1.1   | 7ec1f191-476d-46cd-8fc9-0a8d24dfb8e9 |     2 | | 3.3.3.3   | 7ec1f191-476d-46cd-8fc9-0a8d24dfb8e9 |     3 | | 4.4.4.4   | 7ec1f191-476d-46cd-8fc9-0a8d24dfb8e9 |     4 | | 9.99.9.10 | 7ec1f191-476d-46cd-8fc9-0a8d24dfb8e9 |     5 | +-----------+--------------------------------------+-------+

what should mysql?

to desired output can use rank query in update using user defined variables, have correct ordering assume every combination of address,subnet_id unique

update table1 t1  join ( select address,subnet_id, @r:= case when @g = subnet_id @r +1 else 0 end rownum, @g:= subnet_id table1 cross join (select @r:= 0 , @g:=null) vars order subnet_id  ) t2 using(address,subnet_id)  set major = t2.rownum

demo


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