Frequently one wants a data set returned in the same order as the
index used in the query. Informix (at least) has implicit order-by,
which means that the data will be returned in collating order if the
query forces use of the appropriate index.

Does Postgresql have this?

If not, does an Order-by force a sort even if an index has the correct
order to satisfy the order-by?

Thanks

John Moore

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