在学习navicate，请教一下，我想求两个日期的差值，admittime是这样的数据2139-09-26 14:16:00，anchor_year是这样的数据2126，网上抄的代码，但是运行不了，求解答
SELECT
ad.subject_id
, ad.hadm_id
, ad.admittime
, pa.anchor_age
, pa.anchor_year
, DATETIME_DIFF(ad.admittime, DATETIME(pa.anchor_year, 1, 1, 0, 0, 0), YEAR) + pa.anchor_age AS age
FROM mimic.mimic_core.admissions ad
INNER JOIN mimic.mimic_core.patients pa
ON ad.subject_id = pa.subject_id
> 错误: 函数 datetime(smallint, integer, integer, integer, integer, integer) 不存在
LINE 7: , DATETIME_DIFF(ad.admittime, DATETIME(pa.anchor_year, 1, 1...
^
HINT: 没有匹配指定名称和参数类型的函数. 您也许需要增加明确的类型转换.
> 时间: 0.002s