Oracle SQL分組依據

Question

在我的應用程序中，我記錄了下表中打開的文件：

TESTID        SITE       LATEST_READ READ_COUNT FILE_ORIGIN_ID
------------- ---------- ----------- ---------- --------------
File1        |Site1     |02/05/13   |         2|             1 
File1        |Site2     |22/01/14   |         3|             2 
File2        |Site1     |02/06/14   |         8|             0 
File3        |Site1     |19/09/14   |        17|             0 
File4        |Site2     |19/09/14   |        14|             2 
File4        |Site2     |19/09/14   |        34|             1  
File4        |Site3     |19/09/14   |        10|             0 
File5        |Site2     |19/09/14   |        44|             2  
File5        |Site3     |19/09/14   |         1|             2 

如果文件的FILE_ORIGIN_ID至少之一不同於2我想獲取每個文件的讀取計數的總和。

這個例子應該給出：

TESTID        SITE       LATEST_READ SUM        FILE_ORIGIN_ID
------------- ---------- ----------- ---------- --------------
File1        |Site1     |02/05/13   |         5|             1 
File2        |Site1     |02/06/14   |         8|             0 
File3        |Site1     |19/09/14   |        17|             0 
File4        |Site2     |19/09/14   |        58|             X <-- can be 0 or 1 
File5        |Site2     |19/09/14   |        44|             2  
File5        |Site3     |19/09/14   |         1|             2 

我嘗試了以下方法：

SELECT TESTID, SUM(READ_COUNT), LATEST_READ, FILE_ORIGIN_ID, site
FROM FILE_USAGE_LOG 
GROUP BY TESTID, TESTID, LATEST_READ, 
          CASE 
            WHEN FILE_ORIGIN_ID <> '2' Then 1
            ELSE 0
          END, site
ORDER BY TESTID;

但這不是我想要做的...我該如何改善呢？ 而如果將行分組，我該如何將FILE_ORIGIN_ID設置為0或1

Answer 1

現在，我得到了部分結果，它將以您需要的格式返回TESTID和READ_COUNT：

select testid, read_count FROM
(SELECT testid, sum(read_count) as  read_count
FROM FILE_USAGE_LOG
where testid in (select distinct testid from FILE_USAGE_LOG
                 where not file_origin_id = 2)
group by testid)
UNION
(select testid, read_count
 FROM FILE_USAGE_LOG
 where testid not in (select distinct testid from FILE_USAGE_LOG
                 where not file_origin_id = 2))
ORDER BY testid

這不是您想要的確切結果，因為在其他字段上進行分組將為您提供不同的結果，但是，如果要獲取除testid（我們正在分組的數據）之外的任何其他數據，則需要將它們匯總在一起函數編輯：添加了不同的值（隨機排列為最小或最大，我認為合適）

select testid,site, read_count,latest_read,file_origin_id, grouped FROM 
(SELECT testid, MIN(site) as site,  sum(read_count) as  read_count
 , max(latest_read) as latest_read, min(file_origin_id) as file_origin_id
 ,'true' as grouped
FROM mytable
where testid in (select distinct testid from mytable
                 where not file_origin_id = 2)
group by testid)
UNION
(select testid, site, read_count, latest_read, file_origin_id, 'false' as grouped
 FROM mytable
 where testid not in (select distinct testid from mytable
                 where not file_origin_id = 2))
ORDER BY testid

小提琴

Answer 2

SQL小提琴

Oracle 11g R2架構設置 ：

CREATE TABLE FILE_USAGE_LOG (TESTID, SITE, LATEST_READ, READ_COUNT, FILE_ORIGIN_ID ) AS
          SELECT 'File1', 'Site1', DATE '2013-05-02', 2, 1 FROM DUAL
UNION ALL SELECT 'File1', 'Site2', DATE '2014-01-22', 3, 2 FROM DUAL
UNION ALL SELECT 'File2', 'Site1', DATE '2014-06-02', 8, 0 FROM DUAL
UNION ALL SELECT 'File3', 'Site1', DATE '2014-09-19', 17, 0 FROM DUAL
UNION ALL SELECT 'File4', 'Site2', DATE '2014-09-19', 14, 2 FROM DUAL
UNION ALL SELECT 'File4', 'Site2', DATE '2014-09-19', 34, 1 FROM DUAL
UNION ALL SELECT 'File4', 'Site3', DATE '2014-09-19', 10, 0 FROM DUAL
UNION ALL SELECT 'File5', 'Site2', DATE '2014-09-19', 44, 2 FROM DUAL
UNION ALL SELECT 'File5', 'Site3', DATE '2014-09-19', 1, 2 FROM DUAL;

查詢1 ：

SELECT  TESTID,
        REGEXP_REPLACE( 
          LISTAGG( SITE, ', ' )
            WITHIN GROUP( ORDER BY SITE ),
          '([^, ]+)(, \1)+($|, )',
          '\1\3'
        ) AS SITES, 
        MAX( LATEST_READ ) AS LATEST_READ,
        SUM(READ_COUNT) AS Total_Read_Count
FROM    FILE_USAGE_LOG 
GROUP BY
        TESTID
HAVING  COUNT( CASE FILE_ORIGIN_ID WHEN 2 THEN NULL ELSE 1 END ) > 0
UNION ALL
SELECT  TESTID,
        SITE,
        LATEST_READ,
        READ_COUNT
FROM    FILE_USAGE_LOG l
WHERE   FILE_ORIGIN_ID = 2
AND     NOT EXISTS ( SELECT 'X'
                     FROM   FILE_USAGE_LOG x
                     WHERE  x.TESTID      = l.TESTID
                     AND    x.FILE_ORIGIN_ID <> 2
                   )
ORDER BY 1,2

結果 ：

| TESTID |        SITES |                 LATEST_READ | TOTAL_READ_COUNT |
|--------|--------------|-----------------------------|------------------|
|  File1 | Site1, Site2 |   January, 22 2014 00:00:00 |                5 |
|  File2 |        Site1 |      June, 02 2014 00:00:00 |                8 |
|  File3 |        Site1 | September, 19 2014 00:00:00 |               17 |
|  File4 | Site2, Site3 | September, 19 2014 00:00:00 |               58 |
|  File5 |        Site2 | September, 19 2014 00:00:00 |               44 |
|  File5 |        Site3 | September, 19 2014 00:00:00 |                1 |

查詢2 ：

SELECT  TESTID,
        REGEXP_REPLACE( 
          LISTAGG( SITE, ', ' )
            WITHIN GROUP( ORDER BY SITE ),
          '([^, ]+)(, \1)+($|, )',
          '\1\3'
        ) AS SITES, 
        MAX( LATEST_READ ) AS LATEST_READ,
        SUM(READ_COUNT) AS Total_Read_Count
FROM    FILE_USAGE_LOG 
WHERE   TESTID NOT LIKE 'this%'
AND     LATEST_READ BETWEEN DATE '2014-01-01' AND DATE '2014-12-31'
GROUP BY
        TESTID
HAVING  COUNT( CASE FILE_ORIGIN_ID WHEN 2 THEN NULL ELSE 1 END ) > 0
UNION ALL
SELECT  TESTID,
        SITE,
        LATEST_READ,
        READ_COUNT
FROM    FILE_USAGE_LOG l
WHERE   FILE_ORIGIN_ID = 2
AND     NOT EXISTS ( SELECT 'X'
                     FROM   FILE_USAGE_LOG x
                     WHERE  x.TESTID      = l.TESTID
                     AND    x.FILE_ORIGIN_ID <> 2
                     AND    TESTID NOT LIKE 'this%'
                     AND    LATEST_READ BETWEEN DATE '2014-01-01' AND DATE '2014-12-31'
                   )
AND     TESTID NOT LIKE 'this%'
AND     LATEST_READ BETWEEN DATE '2014-01-01' AND DATE '2014-12-31'
ORDER BY 1,2

結果 ：

| TESTID |        SITES |                 LATEST_READ | TOTAL_READ_COUNT |
|--------|--------------|-----------------------------|------------------|
|  File1 |        Site2 |   January, 22 2014 00:00:00 |                3 |
|  File2 |        Site1 |      June, 02 2014 00:00:00 |                8 |
|  File3 |        Site1 | September, 19 2014 00:00:00 |               17 |
|  File4 | Site2, Site3 | September, 19 2014 00:00:00 |               58 |
|  File5 |        Site2 | September, 19 2014 00:00:00 |               44 |
|  File5 |        Site3 | September, 19 2014 00:00:00 |                1 |