總和在選擇帶或IF SQL

Question

我創建了一個SELECT這裏，我想「SUM」不同行，如果NIF是相等的其他NIF，合同是相同於其他和產品是100

SELECT 
NIF, 
CONTRACT, 
PRODUCT, 
SUM(SALDO) when PRODUCT=100 
DATE 
from TABLE_AAA 

然後我想轉換成圖表。

NIF  CONTRACT PRODUCT  SALDO DATE 
1  1001  100   1  27/04/2016 
1  1001  100   1  27/04/2016 
1  1003  100   2  27/04/2016 
1  1003  100   2  27/04/2016 
1  1001  102   1  27/04/2016 
2  1001  200   5  27/04/2016 
2  1001  200   1  27/04/2016 

NIF  CONTRACT PRODUCT  SALDO DATE 
1  1001  100   2  27/04/2016 
1  1003  100   4  27/04/2016 
1  1001  102   1  27/04/2016 
2  1001  200   5  27/04/2016 
2  1001  200   1  27/04/2016 

Answer 1

你想兩個查詢實際的結合：

1. 產品100
2. 集合行的其他產品

所以寫兩個查詢，並結合這兩個與不變紀錄UNION ALL：

select nif, contract, product, sum(saldo) as saldo, max(date) as date 
from table_aaa 
where product = 100 
group by nif, contract, product 
union all 
select nif, contract, product, saldo, date 
from table_aaa 
where product <> 100 
order by nif, contract, product, date; 

Answer 2

您需要使用WHERE不是當，並且包括WHERE子句中的其他參數，還需要一個GROUP BY。沒有樣本數據和預期的輸出，這是我認爲你在追求的東西。

SELECT 
NIF, 
CONTRACT, 
PRODUCT, 
SUM(SALDO) AS SUMSALDO, 
DATE 
FROM TABLE_AAA 
WHERE PRODUCT = 100 
AND CONTRACT = NIF 
GROUP BY NIF, CONTRACT, PRODUCT, DATE 

好吧，也許你的意思是這樣的：

SELECT 
NIF, 
CONTRACT, 
PRODUCT, 
SUM(CASE WHEN PRODUCT = 100 AND CONTRACT = NIF THEN SALDO ELSE 0 END) AS SUMSALDO, 
DATE 
FROM TABLE_AAA 
GROUP BY NIF, CONTRACT, PRODUCT, DATE 

Answer 3

這是SQL的SUM函數。 SELECT SUM（column_name）FROM table_name;

在你的情況，

SELECT NIF, CONTRACT, PRODUCT, SUM(SALDO) FROM Table_AAA WHERE PRODUCT = 100 AND NIF = CONTRACT; 

我認爲這將有助於。

Answer 4

你可以嘗試這樣的事情：

SELECT 
NIF, 
CONTRACT, 
PRODUCT, 
CASE 
    WHEN (NIF = CONTRACT AND PRODUCT=100) 
    THEN 
     SUM(SALDO) 
    WHEN(otherCondition) 
    THEN 
     SUM(otherSum) 
    ELSE 
     NULL 
END 
DATE from TABLE_AAA 

您可以在SQL有How do I use properly CASE..WHEN in MySQL找到有關案件的更多信息或有https://dev.mysql.com/doc/refman/5.7/en/case.html

Answer 5

如果你想總結，行滿足相同的條件，你有不止一個條件，我想你可以以下查詢：

SELECT 
NIF, 
CONTRACT, 
PRODUCT, 
SUM(case when NIF=CONTRACT AND PRODUCT=100 THEN SALDO ELSE 0 END) SUM_PROD_100 , 
"DATE" 
from TABLE_AAA 
GROUP BY NIF, CONTRACT,PRODUCT, "DATE" 

您可以使用與「SUM_PROD_100」列中相同的邏輯對其他滿足不同條件的行進行求和。