2
選擇MAX日期我有這個MySQL
查詢:MySQL的加入,從表
SELECT
s.student_id,
s.student_firstname,
s.student_lastname,
sd.student_startdate,
sd.student_enddate,
s.isActive,
c.city_name,
ctc.category_name
FROM
students s
INNER JOIN
(SELECT sd1.student_id, sd1.student_startdate, sd1.student_enddate FROM studentdates sd1) sd ON sd.student_id = s.student_id
INNER JOIN
cityselections c ON c.city_id = s.student_city_id
INNER JOIN
coursecategory ctc ON s.student_course_category_id = ctc.category_id
WHERE
sd.student_enddate BETWEEN CURDATE() AND ADDDATE(CURDATE(), INTERVAL 14 DAY)
AND s.student_city_id NOT LIKE '1'
AND s.student_city_id = 18
AND s.isActive = 1
GROUP BY s.student_id
ORDER BY sd.student_enddate ASC , s.student_lastname , s.student_firstname
在表studentdates
可以有每個student_id
多個student_startdate
和student_enddate
但我要選擇的每個學生MAX(student_enddate)
。
這怎麼辦?
只是使用這個功能'MAX(student_enddate);' – 2013-04-10 09:48:08
呀試過它無處不在,但仍然沒有選擇某種原因最高的日期。 – David 2013-04-10 09:49:22
WHERE sd.student_enddate =( SELECT MAX(sd.student_enddate) FROM表名,如果你想放的任何地方條件 ) – 2013-04-10 09:51:39