我如何在今天午夜到现在之间获取数据？

Question

As the title suggests, I'm simply trying to get the result set between midnight today and right now. So given the time of this post, I want data between 06/30/16 00:00:00 and 06/30/16 15:52:00. Why does the below query not return anything? Thanks.

SELECT * FROM tableName
WHERE event_date >= TO_DATE(TRUNC(SYSDATE) || ' 00:00:00', 'DD-MON-YY HH24:MI:SS')
AND event_date <= TO_DATE(TRUNC(SYSDATE))

Answer 1

SELECT *
FROM   tableName
WHERE  event_date BETWEEN TRUNC(SYSDATE) AND SYSDATE;

Answer 2

The solution was as follows:

SELECT * FROM tableName
WHERE event_date >= TO_DATE(TRUNC(SYSDATE))

I had forgotten that TRUNC(**SYSDATE )** by itself is perceived as midnight unless otherwise specified, so this does the trick.