Question

我有一个查询（精简版-为了清楚起见，已编辑以添加SUM项）-

SELECT STORENBR AS "Store", 
DISPENSER AS "Model",
UPPER(TINTERSERIALNBR) AS "Serial",
SUM (CASE WHEN CLRNTSYS ='CCE' THEN GALLONS ELSE 0 END) AS "2018 CCE gallons",
SUM (CASE WHEN CLRNTSYS ='BAC' THEN GALLONS ELSE 0 END) AS "2018 BAC gallons",
SUM (CASE WHEN CLRNTSYS ='844' THEN GALLONS ELSE 0 END) AS "2018 844 gallons" 
FROM table
GROUP BY STORENBR, DISPENSER, UPPER(TINTERSERIALNBR);

工作正常。但是现在我必须在“序列号”字段中考虑NULL值。我尝试过

SELECT STORENBR AS "Store", 
DISPENSER AS "Model",
ISNULL(UPPER(TINTERSERIALNBR), "N/A") AS "Serial",
SUM (CASE WHEN CLRNTSYS ='CCE' THEN GALLONS ELSE 0 END) AS "2018 CCE gallons",
SUM (CASE WHEN CLRNTSYS ='BAC' THEN GALLONS ELSE 0 END) AS "2018 BAC gallons",
SUM (CASE WHEN CLRNTSYS ='844' THEN GALLONS ELSE 0 END) AS "2018 844 gallons"  
FROM table
GROUP BY STORENBR, DISPENSER, UPPER(TINTERSERIALNBR);

并且Oracle SQL Developer告诉我ISNULL不能与GROUP BY一起使用。

我如何进行这项工作？

Answer 1

您可以在单个查询中添加整个表达式：

SELECT STORENBR AS "Store", 
       DISPENSER AS "Model",
       NVL(UPPER(TINTERSERIALNBR), "N/A") AS "Serial",
       SUM (CASE WHEN CLRNTSYS ='CCE' THEN GALLONS ELSE 0 END) AS "2018 CCE gallons",
       SUM (CASE WHEN CLRNTSYS ='BAC' THEN GALLONS ELSE 0 END) AS "2018 BAC gallons",
       SUM (CASE WHEN CLRNTSYS ='844' THEN GALLONS ELSE 0 END) AS "2018 844 gallons"  
 FROM table
GROUP BY STORENBR, DISPENSER, NVL(UPPER(TINTERSERIALNBR), "N/A");

Answer 2

不是ISNULL，而是NVL，两次-在select和group by语句中

SELECT STORENBR AS "Store", 
DISPENSER AS "Model",
NVL(UPPER(TINTERSERIALNBR), "N/A") AS "Serial",
SUM (CASE WHEN CLRNTSYS ='CCE' THEN GALLONS ELSE 0 END) AS "2018 CCE gallons",
SUM (CASE WHEN CLRNTSYS ='BAC' THEN GALLONS ELSE 0 END) AS "2018 BAC gallons",
SUM (CASE WHEN CLRNTSYS ='844' THEN GALLONS ELSE 0 END) AS "2018 844 gallons"  
FROM table
GROUP BY STORENBR, DISPENSER, NVL(UPPER(TINTERSERIALNBR), "N/A");

Answer 3

在派生表中结束查询，然后执行GROUP BY：

select "Store", 
       "Model",
       "Serial",
       SUM (CASE WHEN CLRNTSYS ='CCE' THEN GALLONS ELSE 0 END) AS "2018 CCE gallons",
       SUM (CASE WHEN CLRNTSYS ='BAC' THEN GALLONS ELSE 0 END) AS "2018 BAC gallons",
       SUM (CASE WHEN CLRNTSYS ='844' THEN GALLONS ELSE 0 END) AS "2018 844 gallons" 
from
(
    SELECT STORENBR AS "Store",
           DISPENSER AS "Model",
           ISNULL(UPPER(TINTERSERIALNBR), "N/A") AS "Serial",
           CLRNTSYS,
           GALLONS 
    FROM table
) dt
GROUP BY "Store", "Model", "Serial"

ISNULL和UPPER与GROUP BY

3 个答案: