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Will MySQL ALTER TABLE reformat field data?

原文 2011-10-09 15:20:37 6 1 mysql/ sql/ types

I need to alter a table to change the Type of a column. If the current column Type is DECIMAL(8,2) and I alter that column to be DOUBLE, will the already-existing data in the column also be changed to reflect the column's new Type?

1 answers

It should. However, always be safe when altering existing tables.

My preferred way of doing this type of operation is:

make a backup
create a new column
update all rows moving the old data over to new column
inspect the new column for anything wrong and fix if necessary
delete the old column

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Will MySQL ALTER TABLE reformat field data?

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1 answers

solution1 2 ACCPTED 2011-10-09 15:27:20

solution1
2 ACCPTED 2011-10-09 15:27:20