What is the `storing` Clause in PostgreSQL?

`storing` is a keyword in PostgreSQL that is used to specify the storage location of a table or index. It is not a column or a field, but rather a property of the table or index as a whole.

When you create a table or index in PostgreSQL, you can specify the `storing` clause to indicate where the data for the table or index should be stored. For example, you might specify that the data should be stored on a particular disk or set of disks, or that it should be stored in memory (in which case it will be lost when the server is restarted).

The `storing` clause is often used in conjunction with other clauses, such as `on` or `with`, to specify the storage location of a table or index. For example:
```
CREATE TABLE mytable ON STORING = disk;
```
This would create a table called `mytable` and store its data on a particular disk.

I hope this helps! Let me know if you have any other questions.