MySQL Reference Manual for version 4.0.18.

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13.2.5.1 Silent Column Specification Changes

In some cases, MySQL silently changes a column specification from that given in a CREATE TABLE statement. (This may also occur with ALTER TABLE.):

If you want to see whether MySQL used a column type other than the one you specified, issue a DESCRIBE tbl_name statement after creating or altering your table.

Certain other column type changes may occur if you compress a table using myisampack. See section 14.1.2.3 Compressed Table Characteristics.


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