== i2b2 - DB Basics ==

This is a very bare basics. I'm only interested at present in the observation_fact table and its relationship with the concept_dimension table within the CRC Cell. And then the correspondence with any ontology tables within the Ontology Cell. 

{{{
+-------------CRC Cell-------------+   +-----------Ontology Cell--------------+
|                                  |   |                                      
|                                  |   |
|        +===================+     |   |     +=====================+
|        | concept_dimension |<<<--------->>>| an ontology table   |  
|        +=========^=========+     |   |     +======================+
|                  |               |   |
|                  |               |   |
|                  |               |   |
|        +=========^=========+     |   |     +======================+
|        | observation_fact  |     |   |     |   table_access       
|        +===V===========V===+     |   |     +======================
|            |           |         |
|            |           |         |
| +==========V========+  |         |
| | patient_dimension |  |         |
| +===================+  |         |
|                        |         |
|             +==========V======+  |
|             | visit_dimension |  |
|             +=================+  |
+----------------------------------+
}}}