Group by day from timestamp

Question

In my posts table, it saves timestamp for each post record.

What query can group posts by day, using this timestamp column?

Answer 1

SELECT
    *
FROM
(
    SELECT DATE(FROM_UNIXTIME(MyTimestamp)) AS ForDate,
           ROW_NUMBER() OVER (PARTITION BY DATE(FROM_UNIXTIME(MyTimestamp)) ORDER BY MyTimeStamp) AS PostRowID,
           *
    FROM   MyPostsTable
)
    AS sequenced_daily_posts
WHERE
    ForDate = 
    AND PostRowID <= 2