mysql怎么比较小时 mysql时间比较大小( 二 )

UNION ALL
SELECT '日'AS`日期部分`,TIMESTAMPDIFF(DAY, '2012-12-21', CURRENT_TIMESTAMP()) AS `数值`
UNION ALL
SELECT '周'AS`日期部分`,TIMESTAMPDIFF(WEEK, '2012-12-21', CURRENT_TIMESTAMP()) AS `数值`
UNION ALL
SELECT '时'AS`日期部分`,TIMESTAMPDIFF(HOUR, '2012-12-21', CURRENT_TIMESTAMP()) AS `数值`
UNION ALL
SELECT '分'AS`日期部分`,TIMESTAMPDIFF(MINUTE, '2012-12-21', CURRENT_TIMESTAMP()) AS `数值`
UNION ALL
SELECT '秒'AS`日期部分`,TIMESTAMPDIFF(SECOND, '2012-12-21', CURRENT_TIMESTAMP()) AS `数值`
;
+----------+----------+
| 日期部分 | 数值|
+----------+----------+
| 年|1 |
| 季度|4 |
| 月|12 |
| 日|388 |
| 周|55 |
| 时|9328 |
| 分|559737 |
| 秒| 33584279 |
+----------+----------+
8 rows in set (0.00 sec)
mysql select CURRENT_TIMESTAMP();
+---------------------+
| CURRENT_TIMESTAMP() |
+---------------------+
| 2014-01-13 16:58:17 |
+---------------------+
1 row in set (0.00 sec)
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