how to count row group in select mysql?

Question

hj all, help me!! I use MYSQL, i have a table with data:

   |id  |  str |
  -------------
   1      aabb
   2      aaac
   3      aaad
   4      aabb
   5      aabb
   6      aaac

i want a query mysql (or function) select return result:

       STT  | str |
       1     aabb
       1     aaac
       1     aaad
       2     aabb
       3     aabb
       2     aaac

STT is number str appears in table thanks!

Answer 1

Just Try this

SELECT A.id, A.str, count(*) AS STT
FROM Table1 A
JOIN Table1 B ON A.str = B.str AND A.id >= B.id
GROUP BY A.id, A.str 

Fiddle Demo

Output:

ID  STR STT
1   aabb    1
2   aaac    1
3   aaad    1
4   aabb    2
5   aabb    3
6   aaac    2