How Oracle performs with 'COUNT' when to go with "GROUP BY"?

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  Hello

  
  

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

  
  

  Table Name: TECH_VALUES:
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------- ------------- ------------ -------------------- --------------
1       100           LETTER_A     0
2       200           LETTER_B     0
3       300           LETTER_C     0
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5       500           LETTER_A2    100                  A 
6       600           LETTER_A3    100                  A 
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13      1300          LETTER_CC2   300                  C
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16      1600          LETTER_CCC6  1500                 C
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18      1800          LETTER_B     0
19      1900          LETTER_B2    1800                 B 
20      2000          LETTER_BB5   1900                 B 
21      2100          LETTER_BBB8  1900                 B

  
  

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  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:

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-------------- ------------------- -------------------- -------------------
LETTER_A       3                   1                    1
LETTER_B       0                   3                    0
LETTER_C       2                   0                    3
LETTER_B       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:

  ID, 
  LINK_ID, 
  TECH_TYPE_A, 
  TECH_TYPE_B, 
  TECH_TYPE_C
  

  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.

  LETTER_A 
  LETTER_B 
  LETTER_C 
  LETTER_B
  

  using something like:

  UPDATE link_counts 
  SET (TECH_TYPE_A,TECH_TYPE_B,TECH_TYPE_C) = 
     (with xyz  where link_id = LINK_COUNTS.link_id .... etc
  

  Which must match exactly the above table/report

  Thank you.

  Tony.
  
  

  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

  (

  SELECT CONNECT_BY_ROOT link_id AS link_id

  Id CONNECT_BY_ROOT ID

  tech_type

  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

  PIVOT (COUNT (*)

  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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