问题
I would like to use a pivot SQL query to construct a result table where the concatenate text as a result within the DATA section of the pivot table.
i.e. i have the following result from using a simple select:
+------------+-----------------+---------------+ | Event Name | Resource Type | Resource Name | +------------+-----------------+---------------+ | Event 1 | Resource Type 1 | Resource 1 | | Event 1 | Resource Type 1 | Resource 2 | | Event 1 | Resource Type 2 | Resource 3 | | Event 1 | Resource Type 2 | Resource 4 | | Event 1 | Resource Type 3 | Resource 5 | | Event 1 | Resource Type 3 | Resource 6 | | Event 1 | Resource Type 3 | Resource 7 | | Event 1 | Resource Type 4 | Resource 8 | | Event 2 | Resource Type 5 | Resource 1 | | Event 2 | Resource Type 2 | Resource 3 | | Event 2 | Resource Type 3 | Resource 11 | | Event 2 | Resource Type 3 | Resource 12 | | Event 2 | Resource Type 3 | Resource 13 | | Event 2 | Resource Type 4 | Resource 14 | | Event 2 | Resource Type 5 | Resource 9 | | Event 2 | Resource Type 5 | Resource 16 | +------------+-----------------+---------------+
And I would like to construct a result query that would look like this:
+---------------------+------------------------+------------------------+---------------------------------------+-----------------+-------------------------------------+ | Event/Resource Type | Resource Type 1 | Resource Type 2 | Resource Type 3 | Resource Type 4 | Resource Type 5 | +---------------------+------------------------+------------------------+---------------------------------------+-----------------+-------------------------------------+ | Event 1 | Resource 1, Resource 2 | Resource 3, Resource 4 | Resource 5, Resource 6, Resource 7 | Resource 8 | NULL | | Event 2 | NULL | Resource 3 | Resource 11, Resource 12, Resource 13 | Resource 14 | Resource 1, Resource 9, Resource 16 | +---------------------+------------------------+------------------------+---------------------------------------+-----------------+-------------------------------------+
I know how to use a PIVOT statement in ms-sql but i don\'t know how to aggregate the Resource Name into a concatenation of comma separated items for each resource type.
P.S I could also use a solution using the Martix provided by SSRS 2008-R2 using Report Builde 3 with the first table as my data set and create a matrix that will aggregate the resource names into a comma separated string.
回答1:
In order to get the result, first you should concatenate the values into the comma separated list.
I would use CROSS APPLY and FOR XML PATH:
SELECT distinct e.[Event Name],
e.[Resource Type],
LEFT(r.ResourceName , LEN(r.ResourceName)-1) ResourceName
FROM yourtable e
CROSS APPLY
(
SELECT r.[Resource Name] + ', '
FROM yourtable r
where e.[Event Name] = r.[Event Name]
and e.[Resource Type] = r.[Resource Type]
FOR XML PATH('')
) r (ResourceName)
See SQL Fiddle with Demo. The gives you result:
| EVENT NAME | RESOURCE TYPE | RESOURCENAME |
------------------------------------------------------------------------
| Event 1 | Resource Type 1 | Resource 1, Resource 2 |
| Event 1 | Resource Type 2 | Resource 3, Resource 4 |
| Event 1 | Resource Type 3 | Resource 5, Resource 6, Resource 7 |
| Event 1 | Resource Type 4 | Resource 8 |
| Event 2 | Resource Type 2 | Resource 3 |
| Event 2 | Resource Type 3 | Resource 11, Resource 12, Resource 13 |
| Event 2 | Resource Type 4 | Resource 14 |
| Event 2 | Resource Type 5 | Resource 1, Resource 9, Resource 16 |
Then you will apply your PIVOT to this result:
SELECT [Event Name],
[Resource Type 1], [Resource Type 2],
[Resource Type 3], [Resource Type 4],
[Resource Type 5]
FROM
(
SELECT distinct e.[Event Name],
e.[Resource Type],
LEFT(r.ResourceName , LEN(r.ResourceName)-1) ResourceName
FROM yourtable e
CROSS APPLY
(
SELECT r.[Resource Name] + ', '
FROM yourtable r
where e.[Event Name] = r.[Event Name]
and e.[Resource Type] = r.[Resource Type]
FOR XML PATH('')
) r (ResourceName)
) src
pivot
(
max(ResourceName)
for [Resource Type] in ([Resource Type 1], [Resource Type 2],
[Resource Type 3], [Resource Type 4],
[Resource Type 5])
) piv
See SQL Fiddle with Demo. Your final result will then be:
| EVENT NAME | RESOURCE TYPE 1 | RESOURCE TYPE 2 | RESOURCE TYPE 3 | RESOURCE TYPE 4 | RESOURCE TYPE 5 |
----------------------------------------------------------------------------------------------------------------------------------------------------------------
| Event 1 | Resource 1, Resource 2 | Resource 3, Resource 4 | Resource 5, Resource 6, Resource 7 | Resource 8 | (null) |
| Event 2 | (null) | Resource 3 | Resource 11, Resource 12, Resource 13 | Resource 14 | Resource 1, Resource 9, Resource 16 |
回答2:
This works for me in SQL 2008, and it's dynamic - will handle additional Resource Type
Working SQLFiddle
IF OBJECT_ID('tempdb..#test') IS NOT NULL
DROP TABLE #test
GO
CREATE TABLE #test
(
eventName VARCHAR(30),
resourceType VARCHAR(30),
resourceName VARCHAR(30)
);
INSERT INTO #test
VALUES ('Event 1','Resource Type 1','Resource 1'),
('Event 1','Resource Type 1','Resource 2'),
('Event 1','Resource Type 2','Resource 3'),
('Event 1','Resource Type 2','Resource 4'),
('Event 1','Resource Type 3','Resource 5'),
('Event 1','Resource Type 3','Resource 6'),
('Event 1','Resource Type 3','Resource 7'),
('Event 1','Resource Type 4','Resource 8'),
('Event 2','Resource Type 5','Resource 1'),
('Event 2','Resource Type 2','Resource 3'),
('Event 2','Resource Type 3','Resource 11'),
('Event 2','Resource Type 3','Resource 12'),
('Event 2','Resource Type 3','Resource 13'),
('Event 2','Resource Type 4','Resource 14'),
('Event 2','Resource Type 5','Resource 9'),
('Event 2','Resource Type 5','Resource 16');
DECLARE @resourceTypes VARCHAR(max);
SELECT @resourceTypes = stuff((SELECT DISTINCT ',[' + resourceType + ']'
FROM #test
FOR xml path('')), 1, 1, '');
DECLARE @query NVARCHAR(max);
SET @query = 'SELECT *
FROM (SELECT eventName,
resourceType,
stuff((SELECT '','' + resourceName + ''''
FROM #test b
WHERE a.eventName = b.eventName
AND a.resourceType = b.resourceType
FOR xml path('''')), 1, 1, '''') resourceName
FROM #test a
GROUP BY eventName,
resourceType) AS data PIVOT (max(resourceName) FOR resourceType IN (' + @resourceTypes + ')) AS pvt';
EXEC(@query);
DROP TABLE #test;
回答3:
In report builder you should use the Table or Matrix wizard and do the following:
Resource Typefield as the column groups.Event Namefield as the row groups.- And
Resource Namefield as details, you will have to use an aggregatre function such asCount.
At this stage complete the wizard then once complete edit the Resource Name cell as an expression. Replace the expression with:
=Join( LookupSet( Fields!EVENT_NAME.Value + Fields!RESOURCE_TYPE.Value,
Fields!EVENT_NAME.Value + Fields!RESOURCE_TYPE.Value,
Fields!RESOURCE_NAME.Value, "DataSet1"), ", ")
Now tried and tested:
回答4:
Full working example:
SET NOCOUNT ON
GO
DECLARE @SourceTable TABLE
(
EventName NVARCHAR(10)
,ResourceType NVARCHAR(20)
,ResourceName NVARCHAR(20)
)
INSERT INTO @SourceTable(EventName,ResourceType,ResourceName)
VALUES ('Event 1','Resource Type 1','Resource 1')
,('Event 1','Resource Type 1','Resource 2')
,('Event 1','Resource Type 2','Resource 3')
,('Event 1','Resource Type 2','Resource 4')
,('Event 1','Resource Type 3','Resource 5')
,('Event 1','Resource Type 3','Resource 6')
,('Event 1','Resource Type 3','Resource 7')
,('Event 1','Resource Type 4','Resource 8')
,('Event 2','Resource Type 5','Resource 1')
,('Event 2','Resource Type 2','Resource 3')
,('Event 2','Resource Type 3','Resource 11')
,('Event 2','Resource Type 3','Resource 12')
,('Event 2','Resource Type 3','Resource 13')
,('Event 2','Resource Type 4','Resource 14')
,('Event 2','Resource Type 5','Resource 9')
,('Event 2','Resource Type 5','Resource 16')
;WITH SourceTable AS
(
SELECT DISTINCT ST1.EventName
,ST1.ResourceType
,(SELECT SUBSTRING((SELECT ',' +ResourceName
FROM @SourceTable AS ST2
WHERE ST1.EventName=ST2.EventName AND ST1.ResourceType=ST2.ResourceType
FOR XML PATH('')),2,200) AS CSV) AS ResourceName
FROM @SourceTable AS ST1
)
SELECT EventName
,[Resource Type 1]
,[Resource Type 2]
,[Resource Type 3]
,[Resource Type 4]
,[Resource Type 5]
FROM
(
SELECT EventName
,ResourceType
,ResourceName
FROM SourceTable
) PivotSource
PIVOT
(
MAX(ResourceName) FOR ResourceType IN ([Resource Type 1],[Resource Type 2],[Resource Type 3],[Resource Type 4],[Resource Type 5])
) PivotTable
SET NOCOUNT OFF
GO
来源：https://stackoverflow.com/questions/14783680/sql-pivot-and-string-concatenation-aggregate