FINAL UPDATE: I had forgotten to run the initdb command. By running this command ps auxwww grep postgres I see that postgres is not running ps auxwww grep postgres. Postgres ships with a number of very useful command line utilities that make the above process much easier. Instead of logging into psql, executing SQL queries, and needing to know the details of the query statements, you can use a familiar command line interface to do the same tasks. Mar 17, 2020 Postgres can be installed on Windows, Mac, Linux, and it can even be deployed inside a Docker container.This guide walks you through the procedure using Ubuntu Linux. However, all export commands can be used in any other supported operating system. If you don’t have Postgres, you can install it by downloading the software from the developer’s website. Nov 22, 2018 Set environment variable for mac. You need to set the environment variable in order to work with postgresql through the command line. Open the terminal in your mac and the open profile file with an editor and paste the below line in your profile file (Profile file can be.profile or.bashprofile in your home directory) export PATH=/Library.
Introduction
PostgreSQL (or Postgres) is an object-relational database management system similar to MySQL but supports enhanced functionality and stability. One excellent feature is that you can export a Postgres table to a .CSV file. This can be especially helpful when transferring a table to a different system or importing it to another database application.
In this tutorial, you will learn how to export a Postgres table to a .CSV file using the
copy
and COPY
commands.- PostgreSQL installed on the system
- An existing database in PostgreSQL
- A terminal window / command line (Ctrl+Alt+T)
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Postgres can be installed on Windows, Mac, Linux, and it can even be deployed inside a Docker container. This guide walks you through the procedure using Ubuntu Linux. However, all export commands can be used in any other supported operating system.
If you don’t have Postgres, you can install it by downloading the software from the developer’s website. Install Postgres on Ubuntu from the default repositories by entering the following:
Once the service starts, you need to create or import a database.
Note: .CSV files are useful for a couple of reasons. First, you can open and read them by any text editor, without a tool that reads metadata. Second, they are versatile, and most database programs can import a .CSV file.
Export Data from Table to .CSV with COPY Command
In psql there are two different commands.
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The basic usage of the
COPY
command is as follows:Replace
db_name
with the actual name of your database and the /path/to/destination
with the actual location you want to store the .CSV file in.For example, in Windows, you might want to save a copy to C:tmpdb_name.csv. In Linux, the default path could be /tmp/db_name.csv. Then, you can open the .CSV file and see the content of the table listed in a slightly different format. You can see the difference in the example below.
First, we list the content of a specified table in the psql shell with the command:
The output displays the values inside our example table as in the image below:
Now you can compare it to its corresponding .CSV file. The data exported from the previously mentioned table appears in a .CSV file, as seen in the following image:
You can use the
COPY
command to target specific columns:Note: You can omit column names by omitting the
HEADER
command. Also, COPY
uses an absolute path. You need to specify the full location where you want to save the .CSV file.Export Data from Table to .CSV with copy Command
Use the
copy
command when working remotely. It allows you to export data from a server to a .CSV file on a local client machine. Use it as follows:Replace
db_name
with the name of the source database. Replace /path/to/destination
with the actual location for the .CSV file. In Windows, you might export to C:tmpdb_name.csv. In Linux, you might export to /tmp/db_name.csv.The
copy
command only requires elevated privileges for the client system. This is helpful if you don’t have sufficient privileges to run the COPY
command on the server. Also, the copy
command allows you to use a relative path.![Line Line](/uploads/1/2/6/4/126438160/273826403.png)
For example, you could specify desktop/db_name.csv on a Windows system, and it would save to the current user’s desktop.
You should now be able to export PostgreSQL tables to .CSV using the
copy
or COPY
commands. You can now import the .CSV to another computer system or database-management tool.Next you should also read
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