[英]MySQL GROUP BY and HAVING Clause
我正在尝试编写一个脚本,以显示至少有两个客户的每个城市的名称,以及该城市的客户数量。
这是我所拥有的,但是我无法弄清楚如何获得客户数量。 我靠近吗?
SELECT CONCAT (FName,' ',LName) AS Customers, city
FROM Customer
GROUP BY City
HAVING COUNT(CID) >= 2
使用次数(*)
SELECT city , count(*)
FROM Customer
GROUP BY City HAVING COUNT(*) >= 2
如您从此示例中看到的:
SELECT Employees.LastName, COUNT(Orders.OrderID) AS NumberOfOrders FROM (Orders
INNER JOIN Employees
ON Orders.EmployeeID=Employees.EmployeeID)
GROUP BY LastName
HAVING COUNT(Orders.OrderID) > 10;
您必须在选择项中输入COUNT(CID)
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