![]() csv file and while importing we should ignore the first row (similarly, while exporting we can use this to specify whether we want to include or exclude the header file). HEADER Signifies that we have a header row in our. 'location + file_name': An absolute path to the file (make sure you have read access to the file).ĭELIMITER ',': Specifies the delimiter, which in our case is a comma: ‘,’.ĬSV Specifies the file type from which we are going to import. ![]() : Provides the table name where you want to import the data.įROM: Specifies that we are going to import from a file (we will also be using TO in order to export it to a file at a later stage). \COPY: This is the command to copy the record to / from the. To understand the execution steps, let’s look at each item in this command: Here is the copy command for your reference: \COPY FROM 'location + file_name' DELIMITER ',' CSV HEADER We will use the COPY command to copy all the records from the. Now that we have the data in a file and the structure in our database, let’s import the. To ensure that our data falls into the right places in the database we need to first create a table structure inside the database. Let’s copy and save this data to a text file using any of the existing text editors on your system (VI, notepad, textedit) and save it as “usa.csv”. This data is comma delimited, so that we can use each comma as an identifier. You can use any existing file, or you can use the data below that comprises a basic. We will explain it using two different options: first, when you are already logged into the database and then call the file from inside a psql prompt and second, from the shell prompt itself. csv file successfully into a PostgreSQL database. Here we will walk through the basic steps you would need to follow to import a. It can also be a “data dump,” if want to move your data from one database server to another for testing or simply move to new hardware. ![]() This can range from simple shell scripts used to gather monitoring data to more complex web form submissions. ![]() It includes an introduction to the CSV file format and some examples of its usage.ĬSV is a universally accepted file data collection format, and many applications output their data in CSV form. In other words, I don't want to have to go in and manually drop table attendees cascade before running the restore.SUMMARY: This article explains how to import data from a CSV file into PostgreSQL and how to export it back from PostgreSQL to CSV. I'm trying to do this using just pg_dump/pg_restore with no editing of the server db between running the two commands. Pg_restore: COPY failed for table "attendees": ERROR: duplicate key value violates unique constraint "attendees_pkey" Pg_restore: Error from TOC entry 2409 0 56001 TABLE DATA attendees Results in this error: pg_restore: Error while PROCESSING TOC: I have also tried using the -clean and -data-only options, but what always gets me when I try to restore is the constraint on the table. I have tried various forms of pg_dump, using both plain-text and binary formats. How can I do this when the table has a constraint and already exists in both databases? I need to rewrite the data in the table on my server with the data in the table on my development computer. ![]()
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