db********@yahoo.com wrote:
i would like to know when i create a table with identity column,
should i used generated by default or generated as always. since when
i create this table, i might copy some data from another table with
identity column also, (so if i use generated as always, i can't do
insert into new_tables select * from old_table), then i might also
insert new data into this new table (if i do generated by default,
then the new table could have the same identity column value as the
data i copy from another table. please advice
The reason people use 'generated always' is so that the database will
prevent users (or applications) from inserting their own values into
the identity column, no matter what. When a user can assign a value
to an identity column you run the risk of causing problems when the
identity runs into a duplicate value.
It is possible to LOAD data into a generated-always column using LOAD
with the MODIFIED BY IDENTITYOVERRIDE option. If you do this, though,
make sure you set the appropriate starting point for your identity to
avoid conflicting values.
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