sql的sum函式(與group by,having子句混合使用)
SELECT Customer,SUM(OrderPrice) FROM Orders
WHERE Customer='Bush' OR Customer='Adams'
GROUP BY Customer
HAVING SUM(OrderPrice)>1500
Select sum(downloads) as download from factdownloads_new
where date_time='2013-12-11' and storename='anzhi'
結果:3595443702 3253205502 3631413902 3342157901
用別名as:
Select sum(downloads) from factdownloads_new
where date_time='2013-12-11' and storename='hiapk'
結果:8937649006 8927173006 8952359006 8978768006
sum函式
SQL GROUP BY 例項
我們擁有下面這個 "Orders" 表:
O_Id | OrderDate | OrderPrice | Customer |
---|---|---|---|
1 | 2008/12/29 | 1000 | Bush |
2 | 2008/11/23 | 1600 | Carter |
3 | 2008/10/05 | 700 | Bush |
4 | 2008/09/28 | 300 | Bush |
5 | 2008/08/06 | 2000 | Adams |
6 | 2008/07/21 | 100 | Carter |
現在,我們希望查詢每個客戶的總金額(總訂單)。
我們想要使用 GROUP BY 語句對客戶進行組合。
我們使用下列 SQL 語句:
SELECT Customer,SUM(OrderPrice) FROM Orders GROUP BY Customer
結果集類似這樣:
Customer | SUM(OrderPrice) |
---|---|
Bush | 2000 |
Carter | 1700 |
Adams | 2000 |
sum與having一起使用
過濾資料結果:HAVING 子句篩選滿足條件的結果集
在 SQL 中增加 HAVING 子句原因是,WHERE 關鍵字無法與合計函式一起使用
這個 "Orders" 表:
O_Id | OrderDate | OrderPrice | Customer |
---|---|---|---|
1 | 2008/12/29 | 1000 | Bush |
2 | 2008/11/23 | 1600 | Carter |
3 | 2008/10/05 | 700 | Bush |
4 | 2008/09/28 | 300 | Bush |
5 | 2008/08/06 | 2000 | Adams |
6 | 2008/07/21 | 100 | Carter |
現在,我們希望查詢訂單總金額少於 2000 的客戶。
我們使用如下 SQL 語句:
SELECT Customer,SUM(OrderPrice) FROM Orders GROUP BY Customer HAVING SUM(OrderPrice)<2000
結果集類似:
Customer | SUM(OrderPrice) |
---|---|
Carter | 1700 |
現在我們希望查詢客戶 "Bush" 或 "Adams" 擁有超過 1500 的訂單總金額。
我們在 SQL 語句中增加了一個普通的 WHERE 子句:
SELECT Customer,SUM(OrderPrice) FROM Orders WHERE Customer='Bush' OR Customer='Adams' GROUP BY Customer HAVING SUM(OrderPrice)>1500
結果集:
Customer | SUM(OrderPrice) |
---|---|
Bush | 2000 |
Adams | 2000 |