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Overview

The COPY FROM STDIN command imports data directly from the client into a table. It simplifies the copy process by eliminating the need to transfer files to the server.

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Syntax

The syntax for this function is as follows: 
COPY table_name FROM STDIN;

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Parameters

  • table_name: table where the data will be imported
  • stdin: data coming from the standard input (client application)
When it comes to file format, only CSV files are supported and the default delimiter for this format is a comma ,.

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Additional Options

1. Listing Column Names You can specify the columns into which the data should be imported. 
COPY table_name (column1, column2) FROM stdin;
2. Options You can include additional options following FROM stdin to customize the import process. 
COPY table_name FROM STDIN WITH (FORMAT csv, DELIMITER ',');

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Examples

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Importing Data Manually

  1. Ensure the table exists in your database. If it doesn’t, create one using the following command:
CREATE TABLE film (
    title text NOT NULL,
    length int,
    rating text
    );
You should see the output indicating that the table has been created.
  1. Initiate the import operation by running the following command:
COPY film FROM stdin;
  1. You will be prompted to enter your data. There will be a message as shown below:
Enter data to be copied followed by a newline.
End with a backslash and a period on a line by itself, or an EOF signal.
>>
  1. Paste the data directly from your CSV file into the prompt: 
    ATTRACTION NEWTON,83,PG-13
CHRISTMAS MOONSHINE,150,NC-17
DANGEROUS UPTOWN,121,PG
KILL BROTHERHOOD,54,G
HALLOWEEN NUTS,47,PG-13
HOURS RAGE,122,NC-17
PIANIST OUTFIELD,136,NC-17
PICKUP DRIVING,77,G
INDEPENDENCE HOTEL,157,NC-17
PRIVATE DROP,106,PG
SAINTS BRIDE,125,G
FOREVER CANDIDATE,131,NC-17
MILLION ACE,142,PG-13
SLEEPY JAPANESE,137,PG
WRATH MILE,176,NC-17
YOUTH KICK,179,NC-17
CLOCKWORK PARADISE,143,PG-13
If the import is successful, you will see IMPORT 0 at the end of the line.
To end the import process, for Unix-like systems press Ctrl + D.
  1. Verify the imported data by querying the table in a following way:
SELECT * FROM film;
The output from that query should be as follows: 
    title          | length | rating 
--------------------+--------+--------
ATTRACTION NEWTON   |     83 | PG-13
CHRISTMAS MOONSHINE |    150 | NC-17
DANGEROUS UPTOWN    |    121 | PG
KILL BROTHERHOOD    |     54 | G
HALLOWEEN NUTS      |     47 | PG-13
HOURS RAGE          |    122 | NC-17
PIANIST OUTFIELD    |    136 | NC-17
PICKUP DRIVING      |     77 | G
INDEPENDENCE HOTEL  |    157 | NC-17
PRIVATE DROP        |    106 | PG
SAINTS BRIDE        |    125 | G
FOREVER CANDIDATE   |    131 | NC-17
MILLION ACE         |    142 | PG-13
SLEEPY JAPANESE     |    137 | PG
WRATH MILE          |    176 | NC-17
YOUTH KICK          |    179 | NC-17
CLOCKWORK PARADISE  |    143 | PG-13
(17 rows)

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Direct CSV File Import

Use the following steps to import a CSV file directly into your Oxla instance. This method bypasses the need to manually enter data by reading the file and importing it directly into Oxla. After launching the psql client application and creating the film table, download the film-dataset.csv file and execute the following query: 
COPY table_name FROM '/local/path/to/file' WITH (FORMAT CSV, HEADER);
  • Replace table_name with your target table name
  • Replace /path/to/file with the full path to your CSV file
  • Use HEADER if your CSV file includes column headers

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Importing Data Using cat Method

Ensure your dataset is in a valid CSV format. After creating a table using psql, please follow the following steps:
  1. Type \q followed by Enter to exit psql
  2. Import the CSV File:
cat /local/path/to/file | psql -h localhost -U oxla oxla -c "COPY film FROM STDIN WITH (FORMAT csv, HEADER ',');"
This command reads the contents of film-dataset.csv file and passes it directly to the COPY command.