== i2b2 Ontology and CRC Discussion: 1 ==
Questions asked and points to ponder. Access to the demo database is useful here...

=== Ontology Cell tables compared to CRC concept_dimension table ===
There are three ontology tables within the demo Ontology cell: birn, i2b2 and custom_meta.[[br]] 

When I do a select count(*) from <table_name> where c_visualattributes like '%LA%' I get the following figures:
   * birn: 37
   * custom_meta: 0
   * i2b2: 93807

When I do a "select count(*) from concept_dimension" within the CRC cell I get a count of 73590.[[br]]

The totals are 93844 as opposed to 73590. Why is there a difference and what does it mean?