Mysql 显示id并计数相同的外键

我正在使用MySql。我有一个表，有两列id主键和外键id_。id的数量可以与的id_相同。我想获取所有id，并获取id_与id相关的行数。如何进行此sql查询？到目前为止，我只能得到这个：

选择id，从test_表中选择COUNTid_作为test_表中的count

数据库的表：

我想要的结果是：

你可以试试这个

  ; with cte as ( select distinct id_of, count(*) as Coun from testtable )
  select t.id , c.coun from testtable as t inner join cte as c on t.id_of=c.id_of

您可以尝试以下方法：

select id , count(*) over (partition by id_of) id_of from Yourtable

---

只需要对你的问题稍加更正

  SELECT id, 
 (SELECT COUNT(*) FROM test_table t2 where t2.id_of=t1.id_of) AS count
  FROM test_table t1

---

你可以在subqiery上使用ajoin进行计数

select  a.id, t.count_of_id_of 
from test_table a 
inner join     (
  select  id_of, count(*)  count_of_id_of
  from  test_table 
  group by id_of 
) t on t.id_of= a.id_of

---

标记您的dbms名称问题已更新这里是@AmandepSingh

  SELECT id, 
 (SELECT COUNT(*) FROM test_table t2 where t2.id_of=t1.id_of) AS count
  FROM test_table t1

select  a.id, t.count_of_id_of 
from test_table a 
inner join     (
  select  id_of, count(*)  count_of_id_of
  from  test_table 
  group by id_of 
) t on t.id_of= a.id_of