mysql - 2015 年未曾就诊的患者及其最后一次就诊日期

Question

下面是提取从 2014/7/1 到今天没有见到提供者的患者的脚本。现在我想要一个新专栏，我可以在其中了解他们最后一次见面的日期是什么时候，我该怎么做？下面显示了带有列的表格。

如果您有任何疑问，请告诉我。

SELECT p.first_name, p.last_name, p.date_of_birth, 
       p1.age, p.home_phone, p.cell_phone, 
       p.primarycareprovname, pe.enctimestamp, 
       pe.encnbr, p.city, p.zip, p.person_id    
FROM person AS p 
Inner join patient_ P1 
        on p.person_id=p1.person_id 
LEFT OUTER JOIN Patient_encounter PE 
        ON pe.person_id =p.person_id 
       AND pe.enctimestamp BETWEEN '20140701' AND '20160131'

WHERE pe.person_id IS NULL 
  and p1.age>'59' 
  and p.city like '%Paris%'

Answer 1

您可以使用GROUP BY和MAX():

SELECT p.first_name, p.last_name, p.date_of_birth, p1.age, p.home_phone, 
       p.cell_phone, p.primarycareprovname,
       MAX(pe.enctimestamp) as most_recent_date, p.city, p.zip, p.person_id
FROM person AS p Inner join
     patient_ P1
     on p.person_id = p1.person_id LEFT OUTER JOIN
     Patient_encounter PE
      ON pe.person_id = p.person_id AND
         pe.enctimestamp BETWEEN '20140701' AND '20160131'
WHERE pe.person_id IS NULL and p1.age  >'59' and p.city like '%Paris%'
GROUP BY p.person_id;