我正在尝试获取最新记录。如果我不包含“CustFile.optin”,它可以正常工作但是一旦我添加了这个字段,它就会给我所有的记录。你能帮忙吗?
SELECT BEST.fname, BEST.lname, BEST.email, MAX(CustFile.status_date), CustFile.optin
FROM BEST, CustFile
WHERE BEST.email = CustFile.email
GROUP BY BEST.fname, BEST.lname, BEST.email, CustFile.optin
答案:
fname lname email optin date
a.fname a.lname aa@email y 01/08/2015
b.fname b.lname bb@email n 16/06/2016
答案 0 :(得分:0)
为什么不简单地选择行WHERE MAX(CustFile.status_date) = CustFile.status_date
?
SELECT *
FROM BEST, CustFile
WHERE
BEST.email = CustFile.email AND
MAX(CustFile.status_date) = CustFile.status_date
或者按日期排序(desc),只选择@ Paul-Spiegel所说的最顶层
SELECT *
FROM BEST, CustFile
WHERE BEST.email = CustFile.email
ORDER BY status_date DESC
LIMIT 1