postgresql

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This article introduces the basic form of the `SELECT` statement in `PostgreSQL`, as well as how to use `SELECT` statements to query data from tables. In `PostgreSQL`, the `SELECT` statement is used to retrieve data from one or more tables and it is perhaps the most widely used statement.

This article explains how to use the `IS NULL` operator in PostgreSQL to check if a value is `NULL`. PostgreSQL `IS NULL` is a boolean operator that checks if a value is `NULL`. A `NULL` value is a special value that indicates nothing, it is neither an empty string nor false.

This article introduces two methods to list tables in a PostgreSQL database. PostgreSQL provides two ways to list all tables in a database.