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POmysql select records in last hour, without date
 

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    <p>I have a table of daily emails to be sent. So I'm storing a time of day, as a time field (00:00:00, without a date). A couple example rows might be: </p> <pre><code>mike, timeOfDay = 07:03 meaning "send mike an email daily at 7:03AM" corey, timeOfDay = 23:30 meaning "send corey an email daily at 11:30PM" </code></pre> <p>At any given time, I want to find the emails to send from the last hour. For example, if I run this at 7:55AM, it should get all records between 6:55AM and 7:55AM. That will include mike's email. If the script runs at 12:15AM (00:15), it should get all records between 11:15PM (23:15) and 12:15AM (00:15). This will include corey's email.</p> <p>I've looked at <a href="https://stackoverflow.com/questions/6276110/mysql-select-records-1-hour-or-younger-on-datetime-column">every</a> <a href="https://stackoverflow.com/questions/2999416/find-records-produced-in-the-last-hour">example</a> on <a href="https://stackoverflow.com/questions/2999416/find-records-produced-in-the-last-hour">SO</a> and the web, and they all seem to require a date in addition to the hour. </p> <p>As close as I could come:</p> <pre><code>SELECT `notification`. *, now() as now, DATE_SUB( NOW( ) , INTERVAL 1 HOUR ) as 1hourAgo FROM `notification` WHERE ( `notification`.`timeofday` &gt; DATE_SUB( NOW( ) , INTERVAL 1 HOUR ) ) AND ( `notification`.`timeofday` &lt; NOW( ) ) </code></pre> <p>I figured out a hack to match the hours of this hour and last, before now, but it seems, well, hackish. There must be a correct way to do this!</p> <p>Here's the hack I've got.</p> <pre><code>SELECT `notification`. * , HOUR( NOW( ) ) AS HOUR , HOUR( DATE_SUB( NOW( ) , INTERVAL 1 HOUR ) ) AS 1hourago, time( now( ) ) AS now FROM `notification` WHERE ( HOUR( `notification`.`timeofday` ) = HOUR( NOW( ) ) OR HOUR( `notification`.`timeofday` ) = HOUR( DATE_SUB( NOW( ) , INTERVAL 1 HOUR ) ) ) AND ( `notification`.`timeofday` &lt; TIME( NOW( ) ) ) </code></pre> <p>Thanks for your help!</p>
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