如何在MySQL的where子句中使用max？

Question

我有這個查詢：

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

查詢將如何找到最近的日期並用給定的日期檢查該日期？

Answer 1

您可以這樣嘗試：

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

Answer 2

您是否嘗試從購買中SELECT MAX(date)作為子查詢？

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';