SQL HAVING 關鍵字
HAVING
HAVING
命令用於替代帶有聚合函式的 WHERE 子句。
以下 SQL 列出了每個國家的客戶數量。只包括客戶數量多於 5 個的國家
示例
SELECT COUNT(CustomerID), Country
FROM Customers
GROUP BY Country
HAVING COUNT(CustomerID) > 5;
自己動手試一試 »
以下 SQL 列出了每個國家的客戶數量,並按從高到低的順序排序(只包括客戶數量多於 5 個的國家)
示例
SELECT COUNT(CustomerID), Country
FROM Customers
GROUP BY Country
HAVING COUNT(CustomerID) > 5
ORDER BY COUNT(CustomerID) DESC;
自己動手試一試 »