当想要更改约束所附加到的列、更改约束名称或设置约束的附加属性时，可修改唯一约束。

Modify a unique constraint when you want to change the columns that the constraint is attached to, change the constraint name, or set additional properties for the constraint.

youdao

当想要更改约束所附加到的列、更改约束名称或设置约束的附加属性时，可修改唯一约束。

Modify a unique constraint when you want to change the columns that the constraint is attached to, change the constraint name, or set additional properties for the constraint.

youdao