Re: Dangerous ALTER table ...
You said originally, "we had a simple table with one field" which I took to mean that the table had only one column, since you didn't mention any others.
Did you do a SHOW WARNINGS? What was the result? Any significance to the numbers 65535 or 166227 in relation to the original table data? Did all rows contain NULLs for the cpr column after the query, or only those with more than 25-character values to start with?
(I suspect you may have found a bug, I'm just fishing for some additional info.)
Jon Stephens
MySQL Documentation Team @ Oracle
MySQL Dev Zone
MySQL Server Documentation
Oracle
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