VIEWDEFS 
Using the
system table
VIEWDEFS, you can determine the following database information:
Text that was entered for the definition of your own view table MYVIEW
SELECT definition
FROM DOMAIN.VIEWDEFS
WHERE owner = user
AND viewname = 'MYVIEW'
Only the
owner of a view table can select the definition. No output is provided for any other users.

All view tables: see
VIEWS
Existence of a view table: see
TABLES
Tables and columns forming the basis for a view table: see
VIEWCOLUMNS