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mysql-Mysql查询失败，求帮助，谢谢！
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- 2016-06-06 09:38:31768browse
mysqlsql
明明存在的数据，为什么查询结果为空呢
在weights表中查询weight字段
select weight from weights where feature='经济因素'
这样的查询可以成功，唯独user_id='test'时不行
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