1. There are few statements to investigate the schema like
SHOW DATABASES;
SHOW TABLES;
SHOW COLUMNS OF TABLE ....
SHOW PROPERTIES OF DATABASE;
SHOW PROPERTIES OF TABLE ...
2. There are 2 hidden linked system tables which keep the db schema - "sysitem" and "sysItemDescription"
3. Internally, vKernel builds something like "dependency graph", but it looks there is no way to get it via SQL.
Could you provide some example how do you want to see such dependencies and put it to the Mantis as a feature request?