t is a table which contains sending and receiving date of courier along with their respective customer, Customer ID is c\_id, Courier Id is cr\_id , sanding or receiving date is dt.

```
create table t(c_id int,cr_id int,dt date);

insert into t values
(1,56,'2020-05-15'),(56,56,'2020-10-17'),
(1,8,'2020-05-17'),(56,8,'2020-12-17'),
(123,78,'2020-01-17'),(1,78,'2020-12-18');

```

I am inserting customer first which sends a courier and below that which receives a courier if any order placed successfully.

Here I want to retrieve data of senders only with a specific c\_id?