Question

I have a select statement (working)

 Select * FROM 
    (SELECT id, type, color, product,  
    SUM(Quantity) AS TotalQuantity, 
    MAX(Date) AS LatestDate 
    FROM inventory 
    GROUP BY id, color, type) 
    AS alias 
    WHERE TotalQuantity > 0

I am trying to add a WHERE clause to the Max(Date) but I am not having any luck:

I thought I would just change it to: MAX(Date) AS LatestDate WHERE stock = 1 But that does not work.

Not Working:

 Select * FROM 
    (SELECT id, type, color, product,  
    SUM(Quantity) AS TotalQuantity, 
/* Problem Here */ MAX(Date) AS LatestDate WHERE stock = 1
    FROM inventory 
    GROUP BY id, color, type) 
    AS alias 
    WHERE TotalQuantity > 0

Answer 1

MAX(IF(stock = 1, Date, NULL)) AS LatestDate

It will find the max dates for stock = 1 or null if there is no such rows