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True.

<snip>
The other advantage when selecting the data you need, is the
query optimizer may use an IOA (Index Only Access), that
means an index or logical file can found where all requested
information is stored in the key fields, so no further access
to the data base record is needed. IOA is the fastest method
to access data. When using SELECT * an IOA will not be possible.

Do you mean if I have select clientnumber and an index on clientnumber the
table will not be used, only the index?
Whereas if I had select *, I would need an index on all the fields for
this to happen?
</snip>


Rob Berendt

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