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POOracle query for time range
 

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    <p>The below is a practice for myself:</p> <p>I've created a table with some values, as:</p> <pre><code>CREATE TABLE my_test AS SELECT ROWNUM ID, TRUNC(SYSDATE)+(LEVEL*5/24/60/60)date_time , 111 person_id FROM dual CONNECT BY LEVEL &lt;= (24*60*60)/5 ORDER BY 1; </code></pre> <p>Now, I updated table , <code>person_id = 222</code> for <code>date_time</code> between <code>5:30 am</code> and <code>6:30 am</code></p> <pre><code>UPDATE my_test SET person_id = 222 WHERE date_time &gt;= trunc(SYSDATE)+ 5/24 + 30/24/60 AND DATE_TIME &lt;= trunc(sysdate)+ 6/24 + 30/24/60; </code></pre> <p>I need to take the number of persons in each hour, so I've written a code like:</p> <pre><code>SELECT time_range,count(distinct person_id) PERSON_COUNT FROM ( select person_id , date_time, case TO_CHAR(date_time,'hh24') when '00' then '12 AM - 01 AM' when '01' then '01 AM - 02 AM' when '02' then '02 AM - 03 AM' when '03' then '03 AM - 04 AM' when '04' then '04 AM - 05 AM' when '05' then '05 AM - 06 AM' when '06' then '06 AM - 07 AM' when '07' then '07 AM - 08 AM' when '08' then '08 AM - 09 AM' when '09' then '09 AM - 10 AM' when '10' then '10 AM - 11 AM' when '11' then '11 AM - 12 PM' when '12' then '12 PM - 01 PM' when '13' then '01 PM - 02 PM' when '14' then '02 PM - 03 PM' when '15' then '03 PM - 04 PM' when '16' then '04 PM - 05 PM' when '17' then '05 PM - 06 PM' when '18' then '06 PM - 07 PM' when '19' then '07 PM - 08 PM' when '20' then '08 PM - 09 PM' when '21' then '09 PM - 10 PM' when '22' then '10 PM - 11 PM' WHEN '23' THEN '11 PM - 12 AM' end time_range FROM my_test WHERE date_time &gt;= trunc(SYSDATE) AND date_time &lt; trunc(SYSDATE)+1 ORDER BY date_time) GROUP BY time_range; </code></pre> <p>Its working fine without expected ordering. ( The order by time_range not gives the expected as it is string in the outer query).</p> <p>I need to order by time_range, and any simple and easy codes for the above are appreciated. Thanks in advance.</p>
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