问题
In my application I log the file opening in the following table:
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
I want to get the sum of the read count per file if at least one of the FILE_ORIGIN_ID for the file is different from 2.
This example should give:
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
I've tried with the following:
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;
But it's not doing what I want to do... How can I improve this? And how can I, in case of grouped lines set the FILE_ORIGIN_ID to 0 or 1
回答1:
SQL Fiddle
Oracle 11g R2 Schema Setup:
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;
Query 1:
SELECT TESTID,
REGEXP_REPLACE(
LISTAGG( SITE, ', ' )
WITHIN GROUP( ORDER BY SITE ),
'([^, ]+)(, \1)+($|, )',
'\1\3'
) AS SITES,
MAX( LATEST_READ ) AS LATEST_READ,
SUM(READ_COUNT) AS Total_Read_Count
FROM FILE_USAGE_LOG
GROUP BY
TESTID
HAVING COUNT( CASE FILE_ORIGIN_ID WHEN 2 THEN NULL ELSE 1 END ) > 0
UNION ALL
SELECT TESTID,
SITE,
LATEST_READ,
READ_COUNT
FROM FILE_USAGE_LOG l
WHERE FILE_ORIGIN_ID = 2
AND NOT EXISTS ( SELECT 'X'
FROM FILE_USAGE_LOG x
WHERE x.TESTID = l.TESTID
AND x.FILE_ORIGIN_ID <> 2
)
ORDER BY 1,2
Results:
| TESTID | SITES | LATEST_READ | TOTAL_READ_COUNT |
|--------|--------------|-----------------------------|------------------|
| File1 | Site1, Site2 | January, 22 2014 00:00:00 | 5 |
| File2 | Site1 | June, 02 2014 00:00:00 | 8 |
| File3 | Site1 | September, 19 2014 00:00:00 | 17 |
| File4 | Site2, Site3 | September, 19 2014 00:00:00 | 58 |
| File5 | Site2 | September, 19 2014 00:00:00 | 44 |
| File5 | Site3 | September, 19 2014 00:00:00 | 1 |
Query 2:
SELECT TESTID,
REGEXP_REPLACE(
LISTAGG( SITE, ', ' )
WITHIN GROUP( ORDER BY SITE ),
'([^, ]+)(, \1)+($|, )',
'\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
Results:
| 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 |
回答2:
For now I have a partial result that will return you the TESTID and READ_COUNT in the format you need:
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
This is not the exact result you wanted because grouping on the other fields would give you a different result, however if you want to get any other data apart from the testid (which we are grouping on) you will need to put these in an aggregate function EDIT: Added the different values (randomly as min or max as I saw fit)
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
FIDDLE
来源：https://stackoverflow.com/questions/30709480/oracle-sql-group-by-if