如何在MySQL的where子句中使用max？

Question

I have this query:

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

How will the query find the most recent date and check that date with the given date?

Answer 1

You can try like this:

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

Answer 2

Did you try SELECT MAX(date) from purchase as subquery ?

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

Answer 3

You can do this:

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