Rounddown DateTime to just Date in the ORDER BY Query

Hi I need help.

In the current datebase, one field (column) is datetime. It has both date and time component.
Column A. Column B is another column.

I would like to use ORDER BY date and then by column B.

So like this:

SELECT *
FROM TABLE
ORDER BY ROUNDDOWN(A) DESC, B

where rounddown rounds A to just a date not datetime.

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