如何合併和統計除ID列以外完全相同的MySQL行？

Question

我希望能夠合併行並找出有多少是不包含ID。舉例來說，如果我有這個表：

+---------+-----------+-----------+ 
| ID  | Col 1 | Col 2 | 
+---------+-----------+ ----------+ 
| 1  | 1  | 5  | 
| 2  | 1  | 5  | 
| 3  | 4  | 9  | 
| 4  | 3  | 9  | 
| 5  | 1  | 5  | 
| 6  | 1  | 5  | 
| 7  | 1  | 5  | 
| 8  | 4  | 9  | 
+---------+-----------+-----------+ 

它將成爲：

+---------+-----------+-----------+---------+ 
| ID  | Col 1 | Col 2 | Count | 
+---------+-----------+ ----------+---------+ 
| 1  | 1  | 5  | 5  | 
| 2  | 4  | 9  | 2  | 
| 3  | 3  | 9  | 1  | 
+---------+-----------+-----------+---------+ 

什麼會爲這個查詢呢？

Answer 1

在結果ID列旁邊，對我來說，它看起來像你需要：

SELECT Col1, Col2, Count(Col1) 
FROM myTable 
GROUP BY Col1, Col2 

Answer 2

select col1,col2,count(*) as `count` 
from table 
group by col1,col2