消除递归SQL重复

Question

我遇到问题，我的脚本带​​回重复的名称，我不知道如何解决它。我的脚本将列连接成一行。基本上我有管理员名称，我需要在他们分配的建筑物的同一行和列中列出。管理员名称会多次列出，当我连接行时，会列出管理员名称，如下所示（John Doe | John Doe）。联系点和列表有时包含不同的名称。我需要排除列表中的重复名称。我附上了当前和期望结果的屏幕截图。使用db2数据库但不确定版本。感谢您的帮助。

 WITH 
    /***************************************************** 
    *** The cte was used to generate test data easily. *** 
    *****************************************************/ 
    sample_data 
(rownum, project_id , project_name , name_last , name_first, point_of_contact, building_id, building_name, hours_used, 
hours_to_use, percentage_used, capability, bucket_a, bucket_b, bucket_c ) AS 
(
VALUES 
    (1, 10 , 'ELITE', 'Gamb', 'Susan', 'Susan Gamb | Amber Jones', 2, 'Main' , 80, 0, 1.0, 6000, 12000, 9600, 5100) 
, (2, 10 , 'ELITE', 'Gamb', 'Susan', 'Susan Gamb | Amber Jones', 2 , 'Main', 80, 0, 1.0, 7000, 12500, 8000, 4000) 
, (3, 10 , 'ELITE', 'Jones', 'Amber', 'Susan Gamb | Amber Jones', 2, 'Main', 80, 0, 1.0, 6000, 12000, 9600, 5100) 
, (4, 10 , 'ELITE', 'Jones', 'Amber', 'Susan Gamb | Amber Jones', 2, 'Main', 80, 0, 1.0, 7000, 12500, 8000, 4000) 
, (1, 10 , 'ELITE', 'Gamb', 'Susan', 'Susan Gamb | Amber Jones', 6 ,'Warehouse', 40, 40, .5, 6000, 12500, 9600, 5100) 
, (2, 10 , 'ELITE', 'Gamb', 'Susan', 'Susan Gamb | Amber Jones', 6, 'Warehouse' , 40, 40, .5, 7000, 12000, 8000, 4000) 
, (3, 10 , 'ELITE', 'Jones', 'Amber', 'Susan Gamb | Amber Jones', 6, 'Warehouse' , 40, 40, .5, 6000, 12500, 9600, 5100) 
, (4, 10 , 'ELITE', 'Jones', 'Amber', 'Susan Gamb | Amber Jones', 6, 'Warehouse' , 40, 40, .5, 6000, 12000, 8000, 4000) 
, (1, 1040 , 'ROADRUNNER', 'Sugar', 'Paul', 'Paul Sugar | Rob Brown', 2 , 'Main', 60, 20, .75, 5000, 1000, 1200, 4100) 
, (2, 1040 , 'ROADRUNNER', 'Sugar', 'Paul', 'Paul Sugar | Rob Brown', 2, 'Main', 60, 20, .75, 4000, 1500, 1000, 3000) 
, (3, 1040 , 'ROADRUNNER', 'Brown', 'Rob', 'Paul Sugar | Rob Brown', 2, 'Main', 60, 20, .75, 4500, 2000, 1200, 4100) 
, (4, 1040 , 'ROADRUNNER', 'Brown', 'Rob', 'Paul Sugar | Rob Brown', 2, 'Main', 60, 20, .75, 4000, 1500, 1000, 3000) 
, (1, 1040 , 'ROADRUNNER', 'Sugar', 'Paul', 'Paul Sugar | Rob Brown', 6 , 'Warehouse', 60, 20, .75, 4500, 2000, 1200, 4100) 
, (2, 1040 , 'ROADRUNNER', 'Sugar', 'Paul', 'Paul Sugar | Rob Brown', 6, 'Warehouse', 60, 20, .75, 4000, 1500, 1000, 3000) 
, (2, 1040 , 'ROADRUNNER', 'Brown', 'Rob', 'Paul Sugar | Rob Brown', 6, 'Warehouse', 60, 20, .75, 4500, 2000, 1200, 4100) 
, (3, 1040 , 'ROADRUNNER', 'Brown', 'Rob', 'Paul Sugar | Rob Brown', 6, 'Warehouse', 60, 20, .75, 4000, 1500, 1000, 3000) 

) 
    , 

      t2(PROJECT_ID, LIST, POINT_OF_CONTACT, PROJECT_NAME, BUILDING_ID, BUILDING_NAME, HOURS_USED, HOURS_TO_USE, PERCENTAGE_USED, CAPABILITY, 
      BUCKET_A, BUCKET_B, BUCKET_C, cnt) AS 
     (SELECT PROJECT_ID, 
        VARCHAR(NAME_FIRST CONCAT ' ' CONCAT NAME_LAST, 6000), 
        POINT_OF_CONTACT, 
        PROJECT_NAME, 
        BUILDING_ID, 
        BUILDING_NAME, 
        HOURS_USED, 
        HOURS_TO_USE, 
        PERCENTAGE_USED, 
        CAPABILITY, 
        BUCKET_A, 
        BUCKET_B, 
        BUCKET_C, 
        1 
     FROM SAMPLE_DATA 
       WHERE rowNum = 1 
       UNION ALL 
     SELECT 
      t2.PROJECT_ID, 
        t2.list || ' | ' || SAMPLE_DATA.NAME_FIRST CONCAT ' ' CONCAT SAMPLE_DATA.NAME_LAST, 
        SAMPLE_DATA.POINT_OF_CONTACT, 
        SAMPLE_DATA.PROJECT_NAME, 
        SAMPLE_DATA.BUILDING_ID, 
        SAMPLE_DATA.BUILDING_NAME, 
        SAMPLE_DATA.HOURS_USED, 
        SAMPLE_DATA.HOURS_TO_USE, 
        SAMPLE_DATA.PERCENTAGE_USED, 
        SAMPLE_DATA.CAPABILITY, 
        SAMPLE_DATA.BUCKET_A, 
        SAMPLE_DATA.BUCKET_B, 
        SAMPLE_DATA.BUCKET_C, 
        t2.cnt + 1 
     FROM t2, SAMPLE_DATA 

       WHERE t2.PROJECT_ID = SAMPLE_DATA.PROJECT_ID 
       AND   t2.BUILDING_ID = SAMPLE_DATA.BUILDING_ID 
       AND t2.cnt + 1 = SAMPLE_DATA.rowNum 
       )  
     SELECT 
        PROJECT_ID, 
        PROJECT_NAME, 
        POINT_OF_CONTACT, 
        BUILDING_ID, 
        BUILDING_NAME, 
        HOURS_USED, 
        HOURS_TO_USE, 
        PERCENTAGE_USED, 
        CAPABILITY, 
        BUCKET_A, 
        BUCKET_B, 
        BUCKET_C, 
        list 
     FROM t2 
       WHERE (PROJECT_ID, BUILDING_ID, cnt) IN (
     SELECT PROJECT_ID, BUILDING_ID, MAX(rowNum) 
     FROM SAMPLE_DATA 
       GROUP BY PROJECT_ID, BUILDING_ID)  
       order by PROJECT_NAME     

期望的结果：

Answer 1

我能够在测试服务器MSSQL查询并得到它的工作。我尽我所能在db2中查找等效函数。即使这不能直接工作，我希望它能让你走上正确的道路。

在你的第二个选择的T2，我改变了：

t2.list || ' | ' || SAMPLE_DATA.NAME_FIRST CONCAT ' ' CONCAT SAMPLE_DATA.NAME_LAST, 

到

 WHEN LOCATE(SAMPLE_DATA.NAME_FIRST CONCAT ' ' CONCAT SAMPLE_DATA.NAME_LAST, t2.list) > 0 THEN t2.list 
     ELSE t2.list || ' | ' || SAMPLE_DATA.NAME_FIRST || ' ' || SAMPLE_DATA.NAME_LAST 
     END, 

基本上，我们正在检查，如果这个人是已经在列表中，如果是这样，返回当前如果不是，请将它们添加到列表中。