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Yes, as long as there is not bad data it succeeds. Thus the "must be implicitly convertible" succeeds.

Now if I had bogus dates, it doesn't succeed.



-----Original Message-----
From: Charles Wilt [mailto:charles.wilt@xxxxxxxxx]
Sent: Tuesday, October 21, 2014 3:32 PM
To: Midrange Systems Technical Discussion
Subject: Re: DB2 SQL table change efficiency

Are you sure about that?

Per the docs, http://msdn.microsoft.com/en-us/library/ms190273.aspx, ALTER TABLE requires "The previous data type must be implicitly convertible to the new data type."

Charles

On Tue, Oct 21, 2014 at 2:55 PM, Matt Olson <Matt.Olson@xxxxxxxx> wrote:

Anyone know of a product in DB2 that allows for easier table changing?

If you have a table with a character column that contains dates and I
want to change the fields to actual DATE columns it doesn't work using
Alter Table.

In Microsoft SQL it is a couple click affair, change column type and
hit the save button and it will retain all data. I think it does all
these developer efficiency things in the background:


1. Renames table to some temporary name

2. Recreates the table with new data types, fields, etc

3. Copys all the data from the old table to the new table

4. Removes the temporary table

It seems in DB2 in IBM i I lose all these efficiencies?

Anyway to bring this automation back using some tool?

Thanks
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