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我此前电脑里安装的是postgreSql8.3版本，我把它卸载了，现在重新安装postgreSql8.4版本的，这样升级是可行的吗?如果不可以？那么如何操作才能完成这样的升级呢？比如卸载postgreSql8.3版本，格式化C盘，重新安装操作系统后，再安装postgreSql8.4版本可以吗？期待回复！谢谢！

I had installed on your computer is postgreSql8.3 version, I uninstalled it, and now re-install postgreSql8.4 version, so upgrading is feasible? If not? So how to complete this upgrade? Such as unloading postgreSql8.3 version, format the C drive, reinstall the operating system, then install postgreSql8.4 version of you? Expecting a reply! Thank you!

Please keep your issue in one thread - if you post in more threads it is hard to follow because we can't see previous questions and answers.
It will be much easier to fix things in 8.3 unless you want to start with a clean database. Please tell us exactly what problem you are having so that we can suggest the best solution.

在一个线程中，请保持您的问题 - 如果你在多个线程中后很难跟进，因为我们不能看到以前的问题和答案。
定在8.3的东西，除非你想开始一个干净的数据库，它会更容易。请告诉我们你究竟有什么问题，因此，我们可以建议最好的解决方案。