-7023: Dropping of all columns not allowed
Explanation:
You have attempted to drop all the columns in a table. This is not allowed.
User Action:
Delete the table using the DROP TABLE statement. The DROP TABLE statement deletes all view tables, privileges, indexes, CONSTRAINT definitions (REFERENTIAL CONSTRAINT DEFINITION), etc. which depend on this table.
Afterwards, use the CREATE TABLE statement to create a new table with the same name.