I have comma separated value in mysql table field and want to get most common value amongst them.

i.e. I have a table name is `A`, In which there are two fields `id` and `available_values`.

```
 id    available_values
 ---   -----------------
 1     3,5,7,9
 2     3,5
 3     5,9

```

In above example there are value 5 exist in all rows so i need to get this value(mean - 5), because this is available in every records.

Please help to find out the solution.

Thanks in advance.