Topic: Miscellaneous >> Problem with tracking a particular record in hierarchial query
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| Title: Problem with tracking a particular record in hierarchial query |
| adarsh |
Posted: Aug 01, 2007 12:43:53 PM |
Total Post: 1
Joined: Aug, 2007
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Hi all,
I have a hierarchial data stored in two tables as shown below.
Table 1:
Top
----A>
--->B
---->D
--->E
--->F
--->C
--->G
--->H
Top---->D
--->E
--->F
Table 2:
Top
----A>
--->B
---->L
--->M
Now I need to move the data from one table 1 to table 2. While moving the data I have to make check not overwrite the existing data. For example, for the above case if I am trying to move the hierarchial structure of 'A', I should not overwrite the existing structure. This can be done by checking if in the table 2 there exists a record, with parent of each record in the table 1 for the hierarchial structure 'A', if not insert that record. But, the actual problem is that, I want to track from which, the records were not moved and I am not interested in the subsequent levels of it. But, in the above case, it would give me that the records with parent as 'A','B','D' have not been moved.
We may use oracle SYS_CONNECT_BY_PATH,SUBSTR and INSTR functions and do some manipulations to do this. But,if the hierarchial structre is very big then it may throw memory related errors because of SYS_CONNECT_BY_PATH function.
I would like to be thankful if somebody can give me an efficient method to do this so that performance will be better and will not fail for huge hierarchial structures.
Thanks in advance,
Adarsh Sagar. |
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