In the process of using sql, it is found that the data type cannot be changed. The following is the solution,
select the tool in the menu bar, click the option button to
open the option page, as shown in the figure,
tick off the "prevent to save changes that require re-creation of the table", you can
SQL can not change the data type solution
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Origin blog.csdn.net/qq_44685392/article/details/103260707
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