Hi,

It's my test DB, the version is PostgreSQL 9.4beta2. I'm testing with nested 
hstore feature.

testdb=# \d+ test
                         Table "public.test"
Column |  Type  | Modifiers | Storage  | Stats target | Description
--------+--------+-----------+----------+--------------+-------------
id     | text   |           | extended |              |
stats  | hstore |           | extended |              |


testdb=# select * from test;
      id       |                                                                
                         stats
---------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
2b8ea99d60b30 | 
"www.ask.com"=>"{visits=>2.11221003268,pages=>4.22442006537,duration=>197980.836904}",
 
"www.strawberrynet.com"=>"{visits=>2.11221003268,pages=>4.22442006537,duration=>197980.836904}"
(1 row)


testdb=# select (each(channel)).key,(each(channel)).value from visits;
          key          |                                value
-----------------------+----------------------------------------------------------------------
www.ask.com           | 
{visits=>2.11221003268,pages=>4.22442006537,duration=>197980.836904}
www.strawberrynet.com | 
{visits=>2.11221003268,pages=>4.22442006537,duration=>197980.836904}
(2 rows)

The question is how can I get visits/pages/duration separately from the value 
column so that I can do a sum on those metrics individually.


Thank you!
Suya

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