On 6/14/19 2:04 PM, Leandro Guimarães wrote:
Hi,
I have a scenario with a large table and I'm trying to insert it via
a COPY command with a csv file.
Everything works, but sometimes my source .csv file has duplicated
data in the previously fulfilled table. If I add a check constraint and
try to run the COPY command I have an error that stops the whole insertion.
I've tried to put the data in a tmp table and fill the main using
distinct this way (the fields and names are just examples):
INSERT INTO final_table values (name, document)
SELECT DISTINCT name, document
FROM tmp_TABLE t1
WHERE NOT EXISTS (
SELECT 1 FROM final_table t2
WHERE (t2.name <http://t2.name>, t2.document)
IS NOT DISTINCT FROM (t1.name <http://t1.name>, t1.document))
Hit enter too soon on previous post.
Alternative to above query(rough code):
DELETE FROM tmp_TABLE where <check constraint parameters>;
INSERT INTO final_table VALUES () SELECT * tmp_TABLE;
The problem is that my final_table is a large (and partitioned) table
and this query is taking a long time to execute.
Someone have any idea (really guys anything would be great) how to solve
this situation? I need to ignore duplicates instead to have some error.
I'm using*PostgreSQL 9.4* so I can't use "ON CONFLICT" and upgrade is
not an option.
Thanks and Kind Regards!
Leandro Guimarães
--
Adrian Klaver
adrian.klaver@xxxxxxxxxxx
