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Default Reading Access - Multiple Indices

Hi All
I have an Access database file (mdb) that I query from Excel, so far the one
table used has a single index on one variable and my SQL string uses the
'select where' based on this variable.

I now wish to query the same table only using a different variable, I have
added an index in Access to this variable. My query was changed to the
'select where' based on this new variable.

Is this all I need to do? I am assuming that the query takes care of using
the appropriate index, is this true? It appears to work on my test dataset
but when I step it up to 200,000 rows I want to make sure the performance is
maintained.

TIA
Cheers
Nigel




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