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  • MySQL 合并查询,以map或对象的形式返回

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

    原始SQL-> 目的-> 合并查询
    -- 初检数量
    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;
     
    -- 初装数量
    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;
     
    -- 节能改造单
    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;
    
    初次转换:
    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
    
    结果: ---> 不符合预期 : 以MAP或者对象的形式返回 ----> 再次进行转换
    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 
    
    
    ----->与预期有点差距,最后进行整合:
    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
    
    最终效果:

    找了许久,感谢大佬~~

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  • 原文地址:https://www.cnblogs.com/lsys/p/11840610.html
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