PostgreSQL COPY FROM 命令帮助

Question

I have CSV File which is quite large (few hundred MBs) which I am trying to import into Postgres Table, problem arise when there, is some primary key violation (duplicate record in CSV File)

If it has been one I could manually filter out those records, but these files are generated by a program which generate such data every hour. My script has to automatically import it to database.

My question is: Is there some way out that I can set a flag in COPY command or in Postgres so It can skip the duplicate records and continue importing file to table?

Answer 1

My thought would be to approach this in two ways:

1. Use a utility that can help create an "exception report" of duplicate rows, such as this one during the COPY process.
2. Change your workflow by loading the data into a temp table first, massaging it for duplicates (maybe JOIN with your target table and mark all existing in the temp with a dup flag), and then only import the missing records and send the dups to an exception table.

I personally prefer the second approach, but that's a matter of specific workflow in your case.