... operation in Example 3–13 modifies the WM_VALID value of the existing row and creates a new row with the new salary value and the WM_VALID value reflecting the session valid time range, as shown ... WM_VALID values of the existing and inserted rows overlap. (That is, the operation will fail if the new employee and an existing employee have the same ID numbers and their rows are both valid ... file, the row is loaded and the WM_VALID period is set as from the current time until changed.For usage and reference information about the SQL*Loader utility, see Oracle Database Utilities.You...