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mysql-求助。。java程序访问数据库试用AS别名报错Column 'userid' not found.

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Release： 2016-06-06 09:36:57
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mysqljava数据库

本人小白java程序中访问mysql数据库去掉AS别名就可以正常访问，加上别名就报错Column 'userid' not found. 这个别名很重要。。求大神帮助

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mysql java 数据库
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