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Oracle allows you to rename existing columns in a table. So you get the ORA error when trying to include two-column in it. You have to execute separate statements to change the multiple columns.
It will automatically start pointing to the new column name. Whenever you alter the value of a column referenced by the generation-clause of a generated column, Derby recalculates the value of the generated column. A searched update statement depends on the table being updated, all of its conglomerates units of storage such as heaps or indexes , all of its constraints, and any other table named in the WHERE clause or SET expressions.
The positioned update statement depends on the cursor and any tables the cursor references.
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