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Editorial Team
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Asked: 2026-06-05T04:48:40+00:00

While a am executing the query SELECT TIMESTAMPDIFF(SECOND, NOW(), ‘select lastLoginTime from requests where

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While a am executing the query

SELECT TIMESTAMPDIFF(SECOND, NOW(), 'select lastLoginTime from requests where id = 2 ')

Its returning NULL. Any idea why??

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1 Answer

  1. Editorial Team
    mysql> SELECT TIMESTAMPDIFF(SECOND, NOW(), 'select last_update from t1 where actor_id = 2 ');
+--------------------------------------------------------------------------------+
| TIMESTAMPDIFF(SECOND, NOW(), 'select last_update from t1 where actor_id = 2 ') |
+--------------------------------------------------------------------------------+
|                                                                           NULL |
+--------------------------------------------------------------------------------+
1 row in set, 1 warning (0.00 sec)

    remove the ‘ and add ()

    mysql> SELECT TIMESTAMPDIFF(SECOND, NOW(), (select last_update from t1 where actor_id = 2));
+-------------------------------------------------------------------------------+
| TIMESTAMPDIFF(SECOND, NOW(), (select last_update from t1 where actor_id = 2)) |
+-------------------------------------------------------------------------------+
|                                                                    -199167725 |
+-------------------------------------------------------------------------------+
1 row in set (0.00 sec)
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