---------------------------------------------
|           meta_table_page_info            |
---------------------------------------------
| page_id | page | keyword_separator | desc |
---------------------------------------------

--------------------------
|        keywords        |
--------------------------
| keyword_id |  keyword  |
--------------------------

---------------------------
| page_to_keyword_mapping |
---------------------------
| page_id |  keyword_id   |
---------------------------

##</code><code>##

--------------------------------------------------------------
|                   meta_table_page_info                     |
--------------------------------------------------------------
| page_id |    page   | keyword_separator |        desc      |
--------------------------------------------------------------
|    1    | some_page |          ,        | some_description |
--------------------------------------------------------------

--------------------------
|        keywords        |
--------------------------
| keyword_id |  keyword  |
--------------------------
|     1      | keyword_1 |
|     2      | keyword_2 |
|     3      | keyword_3 |
--------------------------

##</code><code>##

---------------------------
| page_to_keyword_mapping |
---------------------------
| page_id |  keyword_id   |
---------------------------
|    1    |       1       |
|    1    |       3       |
--------------------------- 

##</code><code>##

SELECT m.keyword_separator, k.keyword 
  FROM keywords k, page_to_keyword_mapping p, meta_table_page_info m 
  WHERE p.page_id = ? AND m.page_id = p.page_id AND k.keyword_id = p.keyword_id