For example, 

```
create table tblvarchar 
(
lngvarchar character varying(500)
)

```

And Sample Row is 

```
insert into tblvarchar (lngvarchar) values ('110010000001111101010011110000001101011000001')

```

* How to find out the `character`(this case (`0` or `1`)) in `lngvarchar` field using the position of `character` ?
* for example, the `character` in 15th position of `lngvarchar` is `1`

On PostgreSQL 9.2.4