I have a table of history records. One field [added] has a datetime data type. What I'm trying to do is select a users 20 most recent records, but then group them by a string derived from the [added] field. Say its value was 2011-05-24 03:32:57.353, the string is 'Tuesday, May 24, 2011'. I want to group the records by that string, but then order the child nodes by the actual time. I also want a bit of custom XML output.
<ActivityHistory>
<Actvities foo="Tuesday, May 24, 2011">
<Activity id="10000" bar="zoo" bam="2011-05-24 03:32:57.353" />
<Activity id="10001" bar="zoo" bam="2011-05-24 03:31:57.353" />
<Activity id="10002" bar="zoo" bam="2011-05-24 03:28:57.353" />
<Activity id="10003" bar="zoo" bam="2011-05-24 03:21:57.353" />
</Activities>
<Actvities foo="Monday, May 23, 2011">
<Activity id="9990" bar="zoo" bam="2011-05-23 03:32:57.353" />
<Activity id="9989" bar="zoo" bam="2011-05-23 03:31:57.353" />
<Activity id="9988" bar="zoo" bam="2011-05-23 03:28:57.353" />
<Activity id="9987" bar="zoo" bam="2011-05-23 03:21:57.353" />
</Activities>
<Actvities foo="Sunday, May 22, 2011">
<Activity id="9900" bar="zoo" bam="2011-05-22 03:32:57.353" />
<Activity id="9899" bar="zoo" bam="2011-05-22 03:31:57.353" />
<Activity id="9898" bar="zoo" bam="2011-05-22 03:28:57.353" />
<Activity id="9897" bar="zoo" bam="2011-05-22 03:21:57.353" />
</Activities>
</ActivityHistory>
This payload will always only have 0-20 records. Likely it will always be 20.
So far my query looks like this.
SELECT TOP 20
fnHistoryGroupingText(Added) [@foo]
FROM ActivityHistory
WHERE MricId = 1
GROUP BY fnHistoryGroupingText(Added)
FOR XML PATH ('Activities'), ROOT ('ActivityHistory')
It produces XML similar to what I'm looking for.
<ActivityHistory>
<Activities foo="Friday, May 20, 2011" />
<Activities foo="Monday, May 23, 2011" />
<Activities foo="Saturday, May 21, 2011" />
<Activities foo="Sunday, May 22, 2011" />
<Activities foo="Tuesday, May 24, 2011" />
</ActivityHistory>
Notice it is not date sorted and the lack of child nodes. I would like them sorted in reverse chronological order. I purposely excluded some fields from the query as at this point in the query I'm sort of getting the structure I ultimately want. When I introduce the other fields, the XML is way off. Grouping text is a varchar and doesn't covert nicely to a date. I can use the [added] field somehow, but when I include it in the query, it busts my grouping. Can anyone point me in the right direction to correct these problems? [A] Write the query correctly, and [B] Show me how to correctly output the XML I'm looking for.
Try this:
/* INIT */
DECLARE @ActivityHistory TABLE (id int, bar VARCHAR(3), bam datetime)
INSERT INTO @ActivityHistory
SELECT id='10000', bar='zoo', bam='2011-05-24 03:32:57'
UNION SELECT id='10001', bar='zoo', bam='2011-05-24 03:31:57'
UNION SELECT id='10002', bar='zoo', bam='2011-05-24 03:28:57'
UNION SELECT id='10003', bar='zoo', bam='2011-05-24 03:21:57'
UNION SELECT id= '9990', bar='zoo', bam='2011-05-23 03:32:57'
UNION SELECT id= '9989', bar='zoo', bam='2011-05-23 03:31:57'
UNION SELECT id= '9988', bar='zoo', bam='2011-05-23 03:28:57'
UNION SELECT id= '9987', bar='zoo', bam='2011-05-23 03:21:57'
UNION SELECT id= '9900', bar='zoo', bam='2011-05-22 03:32:57'
UNION SELECT id= '9899', bar='zoo', bam='2011-05-22 03:31:57'
UNION SELECT id= '9898', bar='zoo', bam='2011-05-22 03:28:57'
UNION SELECT id= '9897', bar='zoo', bam='2011-05-22 03:21:57'
/* QUERY */
;WITH
resALL AS ( SELECT *
, foo = DATENAME(weekday, bam)+', '+ CONVERT(VARCHAR(30), bam, 107)
, food = CONVERT(VARCHAR(10), bam, 121)
FROM @ActivityHistory AS Activity
)
, resD AS ( SELECT DISTINCT foo, food FROM resALL
)
SELECT
Activities.foo
, (
SELECT id, bar, bam
FROM resALL AS Activity
WHERE foo = Activities.foo
ORDER BY bam desc
FOR XML AUTO, TYPE
)
FROM resD AS Activities
ORDER BY Activities.food DESC
FOR XML AUTO, TYPE, ROOT ('ActivityHistory')
/* OUTPUT
<ActivityHistory>
<Activities foo="Tuesday, May 24, 2011">
<Activity id="10000" bar="zoo" bam="2011-05-24T03:32:57" />
<Activity id="10001" bar="zoo" bam="2011-05-24T03:31:57" />
<Activity id="10002" bar="zoo" bam="2011-05-24T03:28:57" />
<Activity id="10003" bar="zoo" bam="2011-05-24T03:21:57" />
</Activities>
<Activities foo="Monday, May 23, 2011">
<Activity id="9990" bar="zoo" bam="2011-05-23T03:32:57" />
<Activity id="9989" bar="zoo" bam="2011-05-23T03:31:57" />
<Activity id="9988" bar="zoo" bam="2011-05-23T03:28:57" />
<Activity id="9987" bar="zoo" bam="2011-05-23T03:21:57" />
</Activities>
<Activities foo="Sunday, May 22, 2011">
<Activity id="9900" bar="zoo" bam="2011-05-22T03:32:57" />
<Activity id="9899" bar="zoo" bam="2011-05-22T03:31:57" />
<Activity id="9898" bar="zoo" bam="2011-05-22T03:28:57" />
<Activity id="9897" bar="zoo" bam="2011-05-22T03:21:57" />
</Activities>
</ActivityHistory>
*/