Or you could create a function to extract the data from an existing field,
then index on the function?
At 09:39 AM 1/11/02 -0800, Chester Carlton Young wrote:
>In regards to not being able to change tables, a common trick (eg, in
>data warehousing) where tables are read only, is to have a trigger on
>the table populate a secondary table with good index info (like ripping
>street name out of the address) and the oid of the original row. The
>query is a little more complex, but very good performance.
>
>
>> You mention that it may be too late to change the tables, but I guess
>> that's where I'd look next- I once had a similar situation when I
>> worked for an electric utility & we ended up parsing the address lines
>> to find road names & numbers and then loading them into special indexed
>> fields just used for sorting. If you control the input app, maybe you
>> could even have the user enter the fields you want to query on separately.
>>
>> -Nick