如何在mysql的where子句中使用max？

Question

我有這個疑問：

SELECT NAME, date, price 
    FROM purchase 
    WHERE Max(date) < '$lastweek' 
     AND NAME = '$customer' 
     GROUP BY NAME; 

查詢如何找到最近的日期和檢查日期與給定的日期？

Answer 1

你可以嘗試這樣的：

SELECT NAME, date, price 
    FROM purchase 
    WHERE (SELECT Max(date) FROM purchase) < '$lastweek' 
     AND NAME = '$customer' 
     GROUP BY NAME; 

Answer 2

你從購買的子查詢嘗試SELECT MAX(date)？

SELECT NAME, date, price 
    FROM purchase 
    WHERE (SELECT Max(date)) < $lastweek 

Answer 3

你可以這樣做：

SELECT name, MAX(date) as latest_date, price 
FROM purchase 
WHERE name= '$customer' 
GROUP BY name HAVING latest_date = '$date';