How to perform account on a Table hierarchical Oracle based on the Parent link


I have the following to Oracle 11 g R2 hierarchical table definition:

Table Name: TECH_VALUES:

Above the hierarchical table definition, some examples of data might look like this:

------- ------------- ------------ -------------------- --------------
1       100           LETTER_A     0
2       200           LETTER_B     0
3       300           LETTER_C     0
4       400           LETTER_A1    100                  A 
5       500           LETTER_A2    100                  A 
6       600           LETTER_A3    100                  A 
7       700           LETTER_AA1   400                  B 
8       800           LETTER_AAA1  700                  C 
9       900           LETTER_B2    200                  B 
10      1000          LETTER_BB5   900                  B 
12      1200          LETTER_CC1   300                  C
13      1300          LETTER_CC2   300                  C
14      1400          LETTER_CC3   300                  A
15      1500          LETTER_CCC5  1400                 A
16      1600          LETTER_CCC6  1500                 C
17      1700          LETTER_BBB8  900                  B
18      1800          LETTER_B     0
19      1900          LETTER_B2    1800                 B 
20      2000          LETTER_BB5   1900                 B 
21      2100          LETTER_BBB8  1900

Keeping in mind that there are only three Types of technology, i.e. A, B and C, but could not span on different LINK_IDs , how can I do a count on these three different TECH_TYPEs based solely on the ID of parent link where the parent group id is 0 and there are children below them?

NOTE: It is also possible to have parents in dual link ID such as LETTER_B and all values of children but different group ID.

I'm basically after a table/report query that looks like this:

Link ID        Tech Type A         Tech Type B          Tech Type C
-------------- ------------------- -------------------- -------------------
3                   1                    1
0                   3                    0
2                   0                    3
0                   3                    0

Be hierarchical and my table can consist more of 30 000 files, I must also ensure that performance to produce the report above shown here query is fast.

Obviously, in order to produce the report above, I need to gather all necessary County outages based on TECH_TYPE for all parents of the link id where the PARENT_GROUP_ID = 0 and store it in a table according to the guidelines of this report layout.

Hope someone can help with maybe a combined query that performs the counties as well as stores the information in a new table called LINK_COUNTS, which will be based on this report. Columns of this table will be:






At the end of this entire requirement, I want to be able to update the LINK_COUNTS table based on the results returned by the sample data above in a SQL UPDATE transaction as the link ID parent top-level already exists within my table LINK_COUNTS, just need to provide values for breaking County for each parent node link , i.e.





using something like:

UPDATE link_counts


   (with xyz  where link_id = LINK_COUNTS.link_id .... etc

Which must match exactly the above table/report

Thank you.



Hi, John,.

Thanks for posting the sample data.

John Spencer wrote:

...  If you need to hide the ID column, then you could simply encapsulate another external query around me. ...

Or simply not display the id column:

Select link_id, -id,

Count (case when tech_type = 'A' end then 1) tech_a.

Count (case when tech_type = 'B' then 1 end) tech_b,.

Count (case when tech_type = "C" then 1 end) tech_c

of (connect_by_root select link_id link_id,)

the connect_by_root ID, tech_type

of sample_data

Start with parent_group_id = 0

connect prior group_id = parent_group_id)

Link_id group, id

order by link_id, id;

Same results, using SELECT... PIVOT

WITH got_roots AS





OF sample_data

START WITH parent_group_id = 0

CONNECT BY PRIOR group_id = parent_group_id


SELECT link_id, tech_a, tech_b, tech_c

OF got_roots


FOR tech_type IN ('A' AS tech_a

'B' AS tech_b

'C' AS tech_c



Id ORDER BY link_id


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