MERGE
- From: <genegurevich@xxxxxxxxxxxx>
- To: "oracle-l@xxxxxxxxxxxxx"@discover.com
- Date: Tue, 22 Jul 2008 15:11:38 -0500
Hi all:
My application team is doing the following. They have a table (col01,
col02, col11, col12, col13) where col01 and
col02 are primary key. They want to use the merge command to update/insert
the data from a staging table which
has the same layout. One of the values in the col11/12/13 in the staging
table is the new data, the other one or two
are some default values. When they do merge command, these default data
overwrite the data in the main table.
They are looking for a way to only modify the data in one of the columns
(11/12/13) but not the others. If the staging
table's col11 has the real data and col12 and col13 have default values,
they only want to modify the col11 table
in the main table. If the columns col11 and col13 in the stage table have
the real data, they only want to modify
these columns in the main table without affecting the col12 etc. I don't
think that one MERGE command will do that
and that they would either need to provide all the correct data (no
defaults) in the staging table or to create different versions of merge
commands (updating different columns in the main table) and call them based
on what data are written to the staging table.
Am I correct? Is there another (better) way to accomplish this?
thank you
Gene Gurevich
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