Updating cursor

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Attempting to do either results in an error indicating an ambiguous update operation.

In these type of situations, it is ideal to use a Update Cursor, than using the default read only one.The WHERE clause, required in the cursor update, specifies that the update occur to the row the cursor currently points to.If the cursor is not pointing to a row, as is the case immediately after an OPEN or DELETE statement, a runtime error message is generated indicating that a fetch must first be performed.Two cursor updates not separated by a fetch causes the same row to be updated twice if the cursor was opened in the direct update mode.If the cursor was opened in deferred update mode, more than one update cannot be issued against a row, and the update cannot be followed by a DELETE statement on the same row.

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