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MYSQL Date and Time Operations

Date arithmetic

NOW() + INTERVAL 1 DAY -- This time tomorrow
CURDATE() - INTERVAL 4 DAY -- Midnight 4 mornings ago

Show the mysql questions stored that were asked 3 to 10 hours ago (180 to 600 minutes ago):

SELECT qId,askDate,minuteDiff
( SELECT qId,askDate,
 TIMESTAMPDIFF(MINUTE,askDate,now()) as minuteDiff
 FROM questions_mysql
) xDerived
WHERE minuteDiff BETWEEN 180 AND 600
| qId | askDate | minuteDiff |
| 38546828 | 2016-07-23 22:06:50 | 182 |
| 38546733 | 2016-07-23 21:53:26 | 195 |
| 38546707 | 2016-07-23 21:48:46 | 200 |
| 38546687 | 2016-07-23 21:45:26 | 203 |
| ... | | |

MySQL manual pages for TIMESTAMPDIFF().

Beware Do not try to use expressions like CURDATE() + 1 for date arithmetic in MySQL. They don't return what you expect, especially if you're accustomed to the Oracle database product. Use CURDATE() + INTERVAL 1 DAY instead.


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