Change type

Hi!

Sorry for my English..

I want to dinamcly change type of column. If possible, of course.
Trivial idia - create new temporary column, try to write value from old columt
to temporarity (if type conersion ok - this made using select/update command
and type conversion checks on client's side), then delete old column, and
rename temporary column..
 But this decision looked quite ill...

Do you have better idea?

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