你也可以直接使用你的数据库方言表达查询。
You may also express queries in the native SQL dialect of your database.
数据库方言。
数据库方言(即它与哪个数据库对话,因为很多数据库都有略微不同的SQL方言)?
Database dialect (that is, which database it is talking to, because many databases have slightly different SQL dialects)?
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