Insert/Update functionality in postgresql [duplicate] - sql

Question

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Closed 9 years ago.
i'm manually updating table in my DB using import functionality in PostgreSQL. Working with large number of data i came across an issue of duplicating primary keys. I am looking for a script to upload only values that do not violate primary key assumption, and those that to violate are to be ignored (not uploaded or updated).
I have already seen a code that would kind of do what i need however not quite sure if it will work for me.
Columns i am working with are:
acc_ph_id (primary_key);acc_ph_no;ph_type;ph_flag
Any suggestions will be highly appreciated as i am rather new to Postgresql in general.

Answer 1

Upload the table into a staging table with no constraints.
Then load the table into the full table eliminating duplicates:
insert into real_table(acc_ph_id, acc_ph_no, ph_type, ph_flag)
select distinct on (acc_ph_id) acc_ph_id, acc_ph_no, ph_type, ph_flag
from staging_table
order by acc_ph_id;
EDIT:
Oh, if the problem is the keys that already exist, then do:
insert into real_table(acc_ph_id, acc_ph_no, ph_type, ph_flag)
select distinct on (acc_ph_id) acc_ph_id, acc_ph_no, ph_type, ph_flag
from staging_table st
where not exists (select 1
from real_table rt
where rt.acc_ph_id = st.acc_ph_id
)
order by acc_ph_id;