Specify Horse name and Race date as the alternate keys of the access path. You can assume that each horse runs in no more than one race per day; as a result, Race time is not required as a key.
Define the keys by changing entries in the Key no. column as shown; namely, blank the Key no. field for Course code, Race time, and Entry number, and type 1 for Horse name.
Press Enter. Press F3 twice to exit to the Edit File Details panel.
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