Insert Duplicate rows with difrent languages

Question

Hello everybody,
I need your help in solving this query with the most performant way.
I have a table:
Create Table "POSITION" (
id  number,
TEXT varchar2(50),
Language Varchar2(1)
);insert statments
INSERT INTO POSITION
VALUES (1, 'Secretary', 'E');
INSERT INTO POSITION
VALUES (1, 'Secrétaire', 'F');
INSERT INTO POSITION
VALUES (1, 'Segretario', 'I');
INSERT INTO POSITION
VALUES (1, 'Secretario', 'S');
INSERT INTO POSITION
VALUES (2, 'Assistance', 'E');
INSERT INTO POSITION
VALUES (2, 'Ayuda', 'S');As you have seen the text changes in diffrent languages for the same id. for whatever reasons the data is in complete in all languages (some ids missing english some french and some italian). I need a query to insert the missing language(s) in my example above Id number 2 the language French and Italian is missing so the query should copy the record English instead but with Language = 'F' and one more time with language = 'I' and so on.
in addition the query should look first to copy English if it doesn't exist then French if not then Italian when more than language exists.
hope I make it clear. as i said this query should be performant also as the data size is big.
Thanks for your help

Answer 1

Hi,
Okay, I see my mistake now.
You can use MERGE like this:
MERGE INTO     position     dst
USING     (
          SELECT     p.id
          ,     FIRST_VALUE (p.text IGNORE NULLS)
                    OVER ( PARTITION BY  p.id
                           ORDER BY      l.ord_num
                           ROWS BETWEEN  UNBOUNDED PRECEDING
                                    AND          UNBOUNDED FOLLOWING
                         )     AS top_text
          ,     FIRST_VALUE (p.lsource_anguage IGNORE NULLS)
                    OVER ( PARTITION BY  p.id
                           ORDER BY      l.ord_num
                           ROWS BETWEEN  UNBOUNDED PRECEDING
                                    AND          UNBOUNDED FOLLOWING
                         )     AS source_language
          ,     l.language
          FROM           all_languages     l
          LEFT OUTER JOIN  position     p     PARTITION BY (p.id)
                                   ON  l.language     = p.language
     )               src
ON     (     src.id          = dst.id
     AND     src.language     = dst.language
WHEN NOT MATCHED THEN
INSERT     (dst.id, dst.text,     dst.language, dst.source_language)
VALUES     (src.id, src.top_text, src.language, src.source_language)
;Or you can use INSERT, like this:
INSERT INTO     position (id, text, language, source_language)
WITH     got_analytics     AS
     SELECT     p.id
     ,     p.text          AS orig_text
     ,     FIRST_VALUE (p.text IGNORE NULLS)
               OVER ( PARTITION BY  p.id
                      ORDER BY      l.ord_num
                      ROWS BETWEEN  UNBOUNDED PRECEDING
                               AND          UNBOUNDED FOLLOWING
                    )     AS top_text
     ,     l.language
     ,     FIRST_VALUE (p.source_language IGNORE NULLS)
               OVER ( PARTITION BY  p.id
                      ORDER BY      l.ord_num
                      ROWS BETWEEN  UNBOUNDED PRECEDING
                               AND          UNBOUNDED FOLLOWING
                    )     AS source_language
     FROM           all_languageS     l
     LEFT OUTER JOIN  position     p     PARTITION BY (p.id)
                              ON  l.language     = p.language
SELECT     id, top_text, language, source_language
FROM     got_analytics
WHERE     orig_text     IS NULL
;This is basically what I posted before, except that I added
...                      ROWS BETWEEN  UNBOUNDED PRECEDING
                               AND          UNBOUNDED FOLLOWINGto all the analytic clauses.
The problem was that when you say "ORDER BY ord_num", that creates a default window that includes only the current ord_num and lower values. We need to look at all values, lower and higher, so we have to override the default windowing.
Edited by: Frank Kulash on Feb 29, 2012 8:58 PM
Edited by: Frank Kulash on Mar 1, 2012 11:31 AM
Added correct MERGE statement.