如何選擇查詢

Question

SELECT district_lease, 
     first_proddate, 
     prod_cnt, 
     @rt := @rt + prod_cnt AS api_cnt   
    FROM Temp1 a 
    JOIN (SELECT @rt := 0) r 
    GROUP BY district_lease, first_proddate 
    ORDER BY district_lease, first_proddate ; 

此查詢組district_lease，first_proddate但運行總計爲完整的查詢計算運行總計未運行，各組的總。我們想要的是每個district_lease和first_proddate的運行總數。

Answer 1

使用sum()功能

查詢：

SELECT district_lease, 
     first_proddate, 
     prod_cnt, 
     sum(prod_cnt) AS api_cnt   
FROM Temp1 a 
GROUP BY district_lease, first_proddate 
ORDER BY district_lease, first_proddate ;