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SQL在有数据情况下更改列的数据类型的方法_MySQL

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Release： 2016-06-01 13:50:43
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    First, remove (or DROP) the PK-FK relationship,

ALTER the column,

then re-establish the relationship.
所有步骤在sql企业管理器中实现

第一步： 去掉所有 关系。 打开设计表，然后就可以去掉表的相关关系

第二部： 改变列的数据类型 。我做的是从 varchar(2) 到 bit 的转变，其他相关的我感觉也该能进行相互转变

第三部： 恢复第一步中去掉的所有关系

goog !祝你好运！！！

 

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