If you specify more than one sort key, the sort key on the left will be the minor sort key and the one on the right will be the major sort key.

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In sorting, the sort key on the left is the major sort key, and the one on the right is the minor sort key. The major sort key determines the primary order, while the minor sort key is used to sort within groups defined by the major key.

If You Specify More Than One Sort Key, the Sort