MySQL 合併查詢，以map或對象的形式返回

轉載 CSDN博主「小林子林子」 -> https://blog.csdn.net/qq_26106607/article/details/84961254

原始SQL-> 目的-> 合併查詢

-- 初檢數量
SELECT COUNT(1)
FROM installation_order o
WHERE 
o.`init_check_person` = 'wulin' AND o.`init_dispatch_time` >= '2018-01-01 01:00:00' AND o.`init_check_time` <= '2018-12-11 19:06:30' AND o.`init_dispatch_time` IS NOT NULL AND o.`init_check_time` IS NOT NULL;
 
-- 初裝數量
SELECT COUNT(1)
FROM installation_order o
WHERE 
o.`init_costume_person` = 'wulin' AND o.`init_costume_dispatch_time` >= '2018-01-01 01:00:00' AND o.`init_costume_time` <= '2018-12-11 23:06:30' AND o.`init_costume_dispatch_time` IS NOT NULL AND o.`init_costume_time` IS NOT NULL;
 
-- 節能改造單
SELECT COUNT(1)
FROM installation_order o
WHERE 
o.`remould_person` = 'wulin' AND o.`transform_dispatch_order_time` >= '2018-01-01 01:00:00' AND o.`remould_time` <= '2018-12-11 23:06:30' AND o.`transform_dispatch_order_time` IS NOT NULL AND o.`remould_time` IS NOT NULL;

初次轉換：

SELECT COUNT(1) init_check_count 
FROM installation_order o 
WHERE 
o.`init_check_person` = 'wulin' AND o.`init_dispatch_time` >= '2018-01-01 01:00:00' AND o.`init_check_time` <= '2018-12-11 19:06:30' AND o.`init_dispatch_time` IS NOT NULL AND o.`init_check_time` IS NOT NULL 
	
UNION ALL	

SELECT COUNT(1) init_costume_count 
FROM installation_order o 
WHERE o.`init_costume_person` = 'wulin' AND o.`init_costume_dispatch_time` >= '2018-01-01 01:00:00' AND o.`init_costume_time` <= '2018-12-11 23:06:30' AND o.`init_costume_dispatch_time` IS NOT NULL AND o.`init_costume_time` IS NOT NULL 

UNION ALL

SELECT COUNT(1) sn_remould_count 
FROM installation_order o 
WHERE o.`remould_person` = 'wulin' AND o.`transform_dispatch_order_time` >= '2018-01-01 01:00:00' AND o.`remould_time` <= '2018-12-11 23:06:30' AND o.`transform_dispatch_order_time` IS NOT NULL AND o.`remould_time` IS NOT NULL

結果： ---> 不符合預期 : 以MAP或者對象的形式返回 ----> 再次進行轉換

SELECT COUNT(1) a, 0 b, 0 c 
FROM installation_order o 
WHERE o.`init_check_person` = 'wulin' AND o.`init_dispatch_time` >= '2018-01-01 01:00:00' AND o.`init_check_time` <= '2018-12-11 19:06:30' AND o.`init_dispatch_time` IS NOT NULL AND o.`init_check_time` IS NOT NULL 
			
UNION ALL
			
SELECT 0 a, COUNT(1) b, 0 c 
FROM installation_order o 
WHERE o.`init_costume_person` = 'wulin' AND o.`init_costume_dispatch_time` >= '2018-01-01 01:00:00' AND o.`init_costume_time` <= '2018-12-11 23:06:30' AND o.`init_costume_dispatch_time` IS NOT NULL AND o.`init_costume_time` IS NOT NULL 
			
UNION ALL
			
SELECT 0 a, 0 b, COUNT(1) c 
FROM installation_order o 
WHERE o.`remould_person` = 'wulin' AND o.`transform_dispatch_order_time` >= '2018-01-01 01:00:00' AND o.`remould_time` <= '2018-12-11 23:06:30' AND o.`transform_dispatch_order_time` IS NOT NULL AND o.`remould_time` IS NOT NULL

----->與預期有點差距，最後進行整合：

SELECT SUM(a) init_check_count, SUM(b) init_costume_count, SUM(c) sn_remould_count
FROM (
    SELECT COUNT(1) a, 0 b, 0 c 
    FROM installation_order o 
    WHERE o.`init_check_person` = 'wulin' AND o.`init_dispatch_time` >= '2018-01-01 01:00:00' AND o.`init_check_time` <= '2018-12-11 19:06:30' AND o.`init_dispatch_time` IS NOT NULL AND o.`init_check_time` IS NOT NULL 

    UNION ALL
			
    SELECT 0 a, COUNT(1) b, 0 c 
    FROM installation_order o
    WHERE o.`init_costume_person` = 'wulin' AND o.`init_costume_dispatch_time` >= '2018-01-01 01:00:00' AND o.`init_costume_time` <= '2018-12-11 23:06:30' AND o.`init_costume_dispatch_time` IS NOT NULL AND o.`init_costume_time` IS NOT NULL 
			
    UNION ALL
			
    SELECT 0 a, 0 b, COUNT(1) c 
    FROM installation_order o 
    WHERE o.`remould_person` = 'wulin' AND o.`transform_dispatch_order_time` >= '2018-01-01 01:00:00' AND o.`remould_time` <= '2018-12-11 23:06:30' AND o.`transform_dispatch_order_time` IS NOT NULL AND o.`remould_time` IS NOT NULL 
	) AS aaaa

最終效果：

<font color = red size = 5 >找了許久，感謝大佬~~ </font>