SQL Error: 1064, SQLState: 42000错误
无意中用Year_Month做MySQL数据表字段，理所当然的一天就这么废了~
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在MySQL中，下表中的字显式被保留。其中大多数字进制被标准SQL用作列名和/或表名(例如，GROUP)。少数被保留了，因为MySQL需要它们，(目前)使用yacc解析程序。保留字被引起来后可以用作识别符。
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