Sql 如何使用多个select语句按新表达式分组

我的问题是，如何根据Expr1给定的新虚拟列进行分组？

在大多数数据库中，您需要通过以下方式在组中重复该条件：

对于简单表达式来说，嵌套的SELECT是完全不必要的。我不知道人们在哪里学会做这些事情，但我在过去看到过类似的例子。

最简单的方法是：

SELECT date_uploaded, CAST(tablename.date_uploaded AS date) AS newdate
FROM tablename
GROUP BY CAST(tablename.date_uploaded AS date);

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谢谢你，我会尽快回复你

SELECT date_uploaded, CAST(tablename.date_uploaded AS date) AS newdate
FROM tablename
GROUP BY CAST(tablename.date_uploaded AS date);

SELECT * FROM
(

        SELECT date_uploaded,
        (SELECT CAST(tablename.date_uploaded AS date) AS Expr1) AS newdate
        FROM tablename

 )AS TB  

GROUP BY TB.newdate