本文讨论了如何使用SQL语句从数据库表中删除非免费项，并提供了正确的语法和错误实例分析。
delete from revit_new_entity where money<>'免费' 可以
delete from revit_new_entity t where t.money<>'免费' 不行
[SQL]delete from revit_new_entity t where t.money<>'免费'
[Err] 1064 - 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 't where t.money<>'免费'' at line 1
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