MySQL查詢的WHERE條件問題

Question

我有一個工作查詢作爲

SELECT p.id, 
      p.name AS ProductName, 
      count(DISTINcT s.salesid) as Sales, 
      Count(DISTINCT l.linkid) as Links 
    FROM products p 
LEFT JOIN sales s ON p.id=s.productid 
LEFT JOIN links l ON p.id=l.productid 
GROUP BY p.id 

現在，我只需要那些記錄，或者銷售不等於0或鏈接不等於0或兩個不等於0

我該如何做到這一點？

Answer 1

添加HAVING子句

SELECT p.id, p.name AS ProductName, 
count(DISTINcT s.salesid) as Sales, Count(DISTINCT l.linkid) as Links 
FROM products p 
LEFT JOIN sales s ON p.id=s.productid 
LEFT JOIN links l ON p.id=l.productid 
GROUP BY p.id 
HAVING Sales > 0 OR Links > 0