SQL从表中选择不同的计数和数据

Question

我有一张这样的桌子

+----+----------+------------+
| id | order_id | service_id |
+----+----------+------------+
| 1  | 3423343  | 123        |
+----+----------+------------+
| 2  | 3432356  | 124        |
+----+----------+------------+
| 3  | 2345643  | 123        |
+----+----------+------------+
| 4  | 2313343  | 125        |
+----+----------+------------+

我想要得到的是每个 service_id 的计数，它会给出这样的输出

+------------+------+
| service_id | cout |
+------------+------+
| 123        | 2    |
+------------+------+
| 124        | 1    |
+------------+------+
| 125        | 1    |
+------------+------+

还要按Highest -> Lowest的顺序安排

我正在使用 CakePHP 3.2

Answer 1

在 service_id 列上使用 group by 并计算每个组的行数。

SELECT 
    service_id, 
    COUNT(service_id) AS `Count` 
FROM 
    tablename -- your table name
GROUP BY 
    service_id
ORDER BY
    `Count` DESC;