Update query statement oracle

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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. The column values returned by the subquery are assigned to the columns in the column list in order. The first value is assigned to the first column in the list, the second value is assigned to the second column in the list, and so on. Any valid SQL expression. Chooses which rows to update in the database table. Only rows that meet the search condition are updated.