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Home > Database > Mysql Tutorial > mysql-Mysql查询失败，求帮助，谢谢！

mysql-Mysql查询失败，求帮助，谢谢！

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Release： 2016-06-06 09:38:31
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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

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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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mysql sql
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