Sql where，order by，having和groupby query

Question

我可以有一個示例「SELECT」查詢，它由所有where，orderby，having和groupby子句組成......

解釋會有幫助。

Answer 1

SELECT Customer, SUM(OrderPrice) FROM Orders WHERE Customer='tehlulz' OR Customer='Vijay' GROUP BY Customer HAVING SUM(OrderPrice)>1500 ORDER BY Customer 

要打破它一點：

WHERE：用於定義條件。

HAVING：被使用，因爲WHERE關鍵字不能用於集合函數。

GROUP BY：集團的結果通過某些領域

ORDER BY：顯示結果順序（如價格從最大到最小）

Answer 2

彙總訂單的客戶端對於訂購了超過$ 10,000從大到小客戶今年提出：

SELECT ClientName, SUM(OrderTotal) AS OrderTotal 
FROM Orders 
WHERE OrderDate >= '2012-01-01' 
GROUP BY ClientName 
HAVING SUM(OrderTotal) > 10000 
ORDER BY SUM(OrderTotal) DESC