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Showing content from https://neon.com/postgresql/postgresql-tutorial/postgresql-insert below:

PostgreSQL INSERT

Summary: in this tutorial, you will learn how to use the PostgreSQL INSERT statement to insert a new row into a table.

The PostgreSQL INSERT statement allows you to insert a new row into a table.

Here’s the basic syntax of the INSERT statement:

INSERT INTO table1(column1, column2, …)
VALUES (value1, value2, …);

In this syntax:

First, specify the name of the table (table1) that you want to insert data after the INSERT INTO keywords and a list of comma-separated columns (colum1, column2, ....).
Second, supply a list of comma-separated values in parentheses (value1, value2, ...) after the VALUES keyword. The column and value lists must be in the same order.

The INSERT statement returns a command tag with the following form:

INSERT oid count

In this syntax:

The OID is an object identifier. PostgreSQL used the OID internally as a primary key for its system tables. Typically, the INSERT statement returns OID with a value of 0.
The count is the number of rows that the INSERT statement inserted successfully.

If you insert a new row into a table successfully, the return will typically look like:

INSERT 0 1

The INSERT statement has an optional RETURNING clause that returns the information of the inserted row.

If you want to return the entire inserted row, you use an asterisk (*) after the RETURNING keyword:

INSERT INTO table1(column1, column2, …)
VALUES (value1, value2, …)
RETURNING *;

If you want to return some information about the inserted row, you can specify one or more columns after the RETURNING clause.

For example, the following statement returns the id of the inserted row:

INSERT INTO table1(column1, column2, …)
VALUES (value1, value2, …)
RETURNING id;

To rename the returned value, you use the AS keyword followed by the name of the output. For example:

INSERT INTO table1(column1, column2, …)
VALUES (value1, value2, …)
RETURNING output_expression AS output_name;

To insert multiple rows into a table simultaneously, you can use the INSERT multiple rows statement.

The following statement creates a new table called links for the demonstration:

CREATE TABLE links (
  id SERIAL PRIMARY KEY,
  url VARCHAR(255) NOT NULL,
  name VARCHAR(255) NOT NULL,
  description VARCHAR (255),
  last_update DATE
);

Note that you will learn how to create a new table in the subsequent tutorial. In this tutorial, you need to execute it to create a new table.

The following example uses the INSERT statement to insert a new row into the links table:

INSERT INTO links (url, name)
VALUES('https://neon.com/postgresql','PostgreSQL Tutorial');

The statement returns the following output:

INSERT 0 1

To insert character data, you enclose it in single quotes (‘) for example 'PostgreSQL Tutorial'.

If you omit the not null columns in the INSERT statement, PostgreSQL will issue an error. But if you omit the null column, PostgreSQL will use the column default value for insertion.

In this example, the description is a nullable column because it doesn’t have a NOT NULL constraint. Therefore, PostgreSQL uses NULL to insert into the description column.

PostgreSQL automatically generates a sequential number for the serial column so you do not have to supply a value for the serial column in the INSERT statement.

The following SELECT statement shows the contents of the links table:

SELECT	* FROM links;

Output:

id |                url                 |        name         | description | last_update
----+------------------------------------+---------------------+-------------+-------------
  1 | https://neon.com/postgresql | PostgreSQL Tutorial | null        | null
(1 row)

If you want to insert a string that contains a single quote (') such as O'Reilly Media, you have to use an additional single quote (') to escape it. For example:

INSERT INTO links (url, name)
VALUES('http://www.oreilly.com','O''Reilly Media');

Output:

INSERT 0 1

The following statement verifies the insert:

SELECT * FROM links;

Output:

id |                url                 |        name         | description | last_update
----+------------------------------------+---------------------+-------------+-------------
  1 | https://neon.com/postgresql | PostgreSQL Tutorial | null        | null
  2 | http://www.oreilly.com             | O'Reilly Media      | null        | null
(2 rows)

To insert a date into a DATE column, you use the date in the format 'YYYY-MM-DD'.

For example, the following statement inserts a new row with a specified date into the links table:

INSERT INTO links (url, name, last_update)
VALUES('https://www.google.com','Google','2013-06-01');

Output:

INSERT 0 1

The following statement retrieves all data from the links table to verify the insert:

id |                url                 |        name         | description | last_update
----+------------------------------------+---------------------+-------------+-------------
  1 | https://neon.com/postgresql | PostgreSQL Tutorial | null        | null
  2 | http://www.oreilly.com             | O'Reilly Media      | null        | null
  3 | https://www.google.com             | Google              | null        | 2013-06-01
(3 rows)

To get the last inserted ID from the inserted row, you use the RETURNING clause of the INSERTstatement.

For example, the following statement inserts a new row into the links table and returns the last inserted id:

INSERT INTO links (url, name)
VALUES('https://www.postgresql.org','PostgreSQL')
RETURNING id;

Output:

id
----
  4
(1 row)

Use PostgreSQL INSERT statement to insert a new row into a table.
Use the RETURNING clause to get the inserted rows.

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