As a Rookie in SQL I have a problem creating a query.

Here is the problem : I would like to check on a table if there are lines that share the same DATES.

For example I would like to know if in TABLE A, there are cases like this :

```
ID | LIB | START_DATE | END_DATE
01 | A1  | 01-01-2016 | 05-03-2016
02 | A2  | 03-03-2016 | 05-06-2016

```

Those lines are SURVEYS and I would like to know if an admin created a survey that is starting during an other survey. I did some searches on AUTO JOIN but this wasn't really what I was looking for.

My case is a bit more complicated but I will find out myself if you explain how to proceed on this simple case.