Christoph Haller wrote:
>I'm afraid there is no one-step-solution to this.
>You'll have to go the hard way as
>
>CREATE new_table (
>...
>... varchar(100),
>...
>);
>INSERT INTO new_table as SELECT * FROM old_table;
>DROP old_table;
>ALTER TABLE new_table RENAME TO old_table;
>And don't forget about re-creating related indexes etc.
>
>Regards, Christoph
>
>
This has many side effects, like dropped indices that have to be
recreated etc.
You can rename your old column, create a new column varchar(100), update
... set newCol=oldCol, drop oldCol and rename newCol to oldCol
See ALTER TABLE doc for this.
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