>I need to change and index expression from a table from the default (field name) to VAL(fieldname). I can do this easily in the Project Manager, but I need to do this on an installed site using commands in an update program.
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>I thought I would use an ALTER TABLE command but do I need to DROP the FOREIGN key first (it's a 'regular' key) and then ADD the new key? What would the commands be>
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>Thanks

Since it is a regular key, there is nothing to drop, open the table exclusively and issue the command:

INDEX ON VAL(fieldname) TAG tagname