This function returns the binary identifier (UUID) of the schema_name application. If the parameter is NULL or empty string, the function will return the UUID of the currently opened application. If a invalid name is specified, the function will return NULL.
Returns the application UUID or NULL.
Get the list of tables of the current application
SELECT Tabtab.tab_name FROM Tabtab WHERE Tabtab.apl_uuid=Schema_uuid(NULL)