If a default value is not specified, then any old default value that exists and which is appropriate to the new data type will be used. For example, in data types, BOOL cannot be converted to TIMESTAMP, and for the content of a column, if you have CHAR (3) with the content '123', then it can be converted to DECIMAL, however, if the content is 'ABC', it cannot be converted.Ī default value must be convertible to the data type.
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