Mysql Query for Rank (RowNumber) and Groupings -

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I have a similar problem

but it is in SQL Server and MySQL "partition support Does not "As I know what can I do now? Here's the question:

I have a table with some columns: User, Category, Value

and I want to do a query which will give me ranking, According to, but reset to the category.

Example: 

  user1 class A10 user 2 category A11 user 3 category A9 user 4 category B3 user 1 category B11   
 query must return: 
 
  rank user category 1 user 2 category a2 user 1 category 3 user 3 category 1 user 1 category b2 user4 category b  < / Pre> 
 Any ideas?

edit 2 : based on OP's comment:

This works only with some incorrect ranking and it is in the first rank . When the top rank in the same categories similar value is one of the first in rank and the second is in 2bt They have the following rank (1)

the following changes have been suggested: 

  Selection of Rank Please, user, category, price (user select, @cc: = category category, @ cv: = value value, case @ pc = @ cc and @ pv = @ cv, then @rn: = @ rn when @ PC = @cc and @pv! = @vv then @rn: = (@ rn + 1) and ray As a @ rn: = 1 end, @pc: @ccc as temp_currCat, @pv: = @ cv as temp_currVal user_category_values, (select @pc: = '', @cc: = ' ', @pv: =' ', @cv: =' ', @rn: = 0) in order of row_nums category, according to the value) result;

Demo @


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