ORACLE GROUP BY,oraclegroupby

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ORACLE GROUP BY,oraclegroupby

GROUP BY 語句用於結合合計函數,根據一個或多個列對結果集進行分組。
合計函數 (比如 SUM) 常常需要添加 GROUP BY 語句。

文法
SELECT column_name, aggregate_function(column_name)
FROM table_name
WHERE column_name operator value
GROUP BY column_name

例子1:尋找每個客戶的總金額

SELECT Customer,SUM(OrderPrice) FROM Orders
GROUP BY Customer;


例子2:GROUP BY 一個以上的列

SELECT Customer,OrderDate,SUM(OrderPrice) FROM Orders
GROUP BY Customer,OrderDate

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