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Error when change single column collation

Posted By:      Posted Date: September 20, 2010    Points: 0   Category :Sql Server

I try to change a collation on column FirstName on table Person. Then I got following error:

Msg 5074, Level 16, State 1, Line 1
The index 'IX_...' is dependent on column 'FirstName'.
Msg 4922, Level 16, State 9, Line 1
ALTER TABLE ALTER COLUMN FirstName failed because one or more objects access this column.

So should I drop the index before the change and create it again after the change? Any other possible impact on existing data for such kind of change?

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