The following requests are not valid. These examples do not specify options that alter the table.
ALTER TABLE orders MODIFY PRIMARY INDEX; ALTER TABLE orders MODIFY NOT UNIQUE PRIMARY INDEX;
The next example attempts to alter the table not to have a primary index and to add column and row partitioning. The request uses correct syntax but is not valid because orders is populated with rows.
ALTER TABLE orders MODIFY NO PRIMARY INDEX PARTITION BY (COLUMN ADD 5, RANGE_N(o_ordertsz BETWEEN TIMESTAMP '2003-01-01 00:00:00.000000+00:00' AND TIMESTAMP '2009-12-31 23:59:59.999999+00:00' EACH INTERVAL '1' MONTH) );