SQL如何对两个单独的表进行分组，以获取此输出

Question

ok just to paint a picture of what i am trying to achieve.

I have an XML file:

<root>
    <item id="test1" level="1" />
    <item id="test2" level="1">
        <item id="test3" level="2" />
        <item id="test4" level="2" >
            <item id="test5" level="3">
                <item id="test6" level="4" />
            </item>
        </item>
        <item id="test7" level=2" />
    </item>
</root>

I read the XML fine, and store the data into a SQL table like this:

Lets call this tableA

ID     | ParentID  | level
---------------------------
test1      NULL         1
test2      NULL         1
test3      test2        2
test4      test2        2
test5      test4        3
test6      test5        4
test7      test2        2

Now table B looks like this:

    GUID                                |  ID
    -----------------------------------------------
   c567207d-5317-4d0e-b24d-5ae3f7fa5691    test1
   4567207d-4317-4d6e-b25d-7ae3f7fa5691    test3
   a7b94a42-fb00-4011-bd5a-4b48e6e578c5    test1
   fa7989d7-1708-4a90-9bf6-c91f6cef6952    test2
   8a7989d7-5608-5690-9bf6-591f6ce56852    test7
   gta7b94a42-fb00-4011-bd5a-4b48e6e578    test6

I want to write a select statement, that would give me a result like this using tableA and TableB from above:

EDIT: Basically think of it as a file path, I want to find the path to the ID,

so basically for ID: test6

path would be test2 -> test4 -> test5 -> test6

    GUID                                |  ID  |   ID_Level_1  | ID_Level_2 | ID_Level_3 | ID_Level_4    
    ---------------------------------------------------------------------------------------------------------
   c567207d-5317-4d0e-b24d-5ae3f7fa5691    test1       test1
   4567207d-4317-4d6e-b25d-7ae3f7fa5691    test3       test2     test3  
   a7b94a42-fb00-4011-bd5a-4b48e6e578c5    test1       test1     
   fa7989d7-1708-4a90-9bf6-c91f6cef6952    test2       test2
   8a7989d7-5608-5690-9bf6-591f6ce56852    test7       test2     test7
   gta7b94a42-fb00-4011-bd5a-4b48e6e578    test6       test2     test4           test5          test6

How do I achieve this result, what is the SQL CALL required to get the result above, using Table A and Table B?

Answer 1

http://sqlfiddle.com/#!6/d41d8/8850

The trick was using a Recursive CTE . Just cut and paste the following code and it will create 2 temp tables IT WILL NOT DROP THEM. And tweek the recursive cte and select statement to get what you want. Let me know if this isnt what you need.

CREATE TABLE #tempA (ID VARCHAR(20) ,PARENTID VARCHAR(20),[LEVEL] INT)

INSERT INTO #TEMPa
VALUES( 'TEST1',NULL,1)

INSERT INTO #TEMPa
VALUES( 'TEST2',NULL,1)

INSERT INTO #TEMPa
VALUES ('TEST3','TEST2',2)

INSERT INTO #TEMPa
VALUES( 'TEST4','TEST2',2)

INSERT INTO #TEMPa
VALUES ('TEST5','TEST4',3)

INSERT INTO #TEMPa
VALUES ('TEST6','TEST5',4)

INSERT INTO #TEMPa
VALUES ('TEST7','TEST2',2)

create table #tableb(guid varchar(50), id varchar(50));
insert into #tableb values ('c567207d-5317-4d0e-b24d-5ae3f7fa5691',    'test1');
insert into #tableb values ('4567207d-4317-4d6e-b25d-7ae3f7fa5691',    'test3');
insert into #tableb values ('a7b94a42-fb00-4011-bd5a-4b48e6e578c5',    'test1');
insert into #tableb values ('fa7989d7-1708-4a90-9bf6-c91f6cef6952',    'test2');
insert into #tableb values ('8a7989d7-5608-5690-9bf6-591f6ce56852',    'test7');
insert into #tableb values ('gta7b94a42-fb00-4011-bd5a-4b48e6e578',   'test6');

;WITH coolRecursionCTE as
(
SELECT a.id,a.parentid,a.id as TargetElement, 1 AS level,convert(varchar(max),a.parentid) as [path]
FROM #tempA AS a
UNION ALL
SELECT a.ID,a.parentid,c.TargetElement,c.Level+1,convert(varchar(max),a.parentid) +'->' + c.[path]   as [path]
FROM #tempA AS a 
INNER JOIN  coolRecursionCTE AS c ON c.parentid = a.id
where a.parentid is not null
)



SELECT [targetelement], [path] + '->'+[targetelement] FROM coolRecursionCTE AS c
INNER JOIN
(
select targetElement as t , max([level]) as maxLevel from coolRecursionCTE
group by TargetElement) AS E on c.TargetElement = e.t and c.[level] = e.maxLevel 

Answer 2

Without adjusting the stored procedure sample, it might give you a good jump-start to what you are looking to do. Here is the original answer I provided on another question.

It handles a cycling approach of getting recursive hierarchical querying and populating a result table for all records not already processed. You would have to adjust it, and I would suggest at each level you need to go deeper, add an "alter table add " for the next column you would be running it for. You might even need to get into dynamic-SQL as your column names will keep going out.