从一列计算Mysql 5.5中的值并按另一列分组

Question

I want to know number of column1 value group by column2 and total count in mysql 5.5 . below example will help to understand my problem:

-------------------
column1 | column2
-------------------
of      | d1
of      | d1
sf      | d2
sf      | d3
sf      | d3
tf      | d2
tf      | d3
tf      | d1
of      | d1
-------------------

the output will be:

------------------------------
column2 | of | sf | tf | total
-------------------------------
d1      | 3  | 0  |  1 | 4
d2      | 0  | 1  |  1 | 2
d3      | 0  | 2  |  1 | 3
------------------------------

I searched but didn't found exact solution for my scenario. I can do it with RANK but 5.5 will not support RANK function.

Answer 1

You can do it with conditional aggregation:

select column2,
  sum(column1 = 'of') of,
  sum(column1 = 'sf') sf,
  sum(column1 = 'tf') tf,
  count(*) total
from tablename
group by column2

See the demo .
Results:

| column2 | of  | sf  | tf  | total |
| ------- | --- | --- | --- | ----- |
| d1      | 3   | 0   | 1   | 4     |
| d2      | 0   | 1   | 1   | 2     |
| d3      | 0   | 2   | 1   | 3     |