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It will depend on what type you are changing from and to. You may lose some data. You may not be able to carry out some operations on some data. If something has gone from number to text, that could be the case. You can't convert some types, like text to a number. Programs may not run properly or may crash as a result of some data changes. You may have to redesign some forms and reports when data types change, and also some queries. So if data types have to be changed, it needs to be very carefully done. With proper planning and design to start with, data types should not need to be changed.

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