Temporary Table - (PostgreSQL Table)

PostgreSQL allows you to create temporary tables that exist only for the duration of a session. Temporary tables are a useful way to store intermediate results during a complex operation or to share session-specific data among multiple processes. In this tutorial, we'll discuss the syntax, example, output, explanation, use, important points, and summary of a temporary table in PostgreSQL.

Syntax

CREATE TEMPORARY TABLE temp_table_name (
  column1 data_type1,
  column2 data_type2,
  ...
);

Example

Let's create a temporary table in PostgreSQL.

CREATE TEMPORARY TABLE temp_users (
  id SERIAL,
  name VARCHAR(255) NOT NULL,
  email VARCHAR(255) NOT NULL
);

Output

The output of this command would be:

CREATE TABLE

Explanation

In this example, we created a temporary table named "temp_users" with three columns: "id", "name", and "email". The "id" column is of type "SERIAL", which is an auto-incrementing column. The "name" and "email" columns are of type "VARCHAR(255)" and are set to "NOT NULL".

Use

Temporary tables are useful for storing data temporarily and sharing session-specific data among multiple processes. They can also be used to store intermediate results during a complex operation.

Important Points

• Temporary tables are only visible to the session that creates them. Once the session ends, the temporary table is automatically dropped.
• Temporary tables are stored in memory, which makes them faster than regular tables.
• Temporary tables can be indexed, but be aware that these indexes will only be used by queries within the same session.

Summary

In this tutorial, we discussed the concept of a temporary table in PostgreSQL. We covered the syntax, example, output, explanation, use, and important points of creating a temporary table. With this knowledge, you can now use temporary tables to store intermediate results during a complex operation or to share session-specific data among multiple processes in PostgreSQL.