importing data from the old system to the new system, key to the raw16 column

Hi, experts,

now I have a new system, the design of the system is to use raw (16) column as the key column in all tables of database.
of course, when the new system goes live (in production), new records of transactions are written to the new database system.
When the new system inserts new records, it manages itself to avoid any conflict of the raw key column value (16)


Now, I'm dealing with this problem:

I need to import data from the old system to the new system, I use sys_guid() to fill the column raw (16) into the new database system.
How can I avoid conflicts of raw column value (16) between the old system data and the new data of database system?

the sql code I write is very simple:

insert into new_sys_table_a (key_column_raw_16,...,...)
Select sys_guid(), old_sys_col_a, old_sys_col_b
of old_sys_table_a;
insert into new_sys_table_a (key_column_raw_16, col1, col2 )
select key_column_raw_16, col1, col2
from old_sys_table_a;

Tags: Database

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