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                ## period_diff,extract ### 說明 | 函數 | 說明 | | --- | --- | | period_diff(p1,p2) | 返回周期p1和p2之間的月數,p1和p2格式為YYMM或YYYYMM | | extract(unit FROM date) | 函數用于返回日期/時間的單獨部分 | ### 例子:查詢寶寶月齡 ```sql SELECT id, baby_name, baby_birthday, period_diff( extract(YEAR_MONTH FROM curdate()), extract(YEAR_MONTH FROM baby_birthday) ) AS baby_monthage FROM baby; ``` ***** ### 附錄 #### extract函數中unit的值 | Unit 值 | | --- | | MICROSECOND | | SECOND | | MINUTE | | HOUR | | DAY | | WEEK | | MONTH | | QUARTER | | YEAR | | SECOND\_MICROSECOND | | MINUTE\_MICROSECOND | | MINUTE\_SECOND | | HOUR\_MICROSECOND | | HOUR\_SECOND | | HOUR\_MINUTE | | DAY\_MICROSECOND | | DAY\_SECOND | | DAY\_MINUTE | | DAY\_HOUR | | YEAR\_MONTH |
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