报错如下：You have an error in your SQL syntax; check the manual

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报错如下：
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1
报上面的错.针对这个句子
$sql = "UPDATE zsd0c SET zsd0c.3天销售 = \"Y\",zsd0c.10天销售 = \"Y\",zsd0c.28天销售 = \"Y\" where 累计工作日 >= $M-3 and 累计工作日= $M-3 and 累计工作日

如果你的 sql 语句没有错误,是否在连接到 mysql 的时候进行了 set names charset 的操作,
比如 set names 'utf-8'.另外,如果你的表结构不用中文就更专业了.
再问：经测试，和中文字段没有关系的。刚才测试才发现，原因是： while($row = mysql_fetch_array($res)){ echo $row[0].'
'; } $M = $row[0];－－这里$M竟然是空值。真是奇怪了，查询后结果不能传输出来。把｝下移这个问题解决了。感谢这么快给予反馈。

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