Postgres – Understanding SELECT DISTINCT in PostgreSQL

SQL DISTINCT clause is used to remove the duplicates columns from the result set.

The distinct keyword is used with select keyword in conjunction. It is helpful when we avoid duplicate values present in the specific columns/tables. The unique values are fetched when we use the distinct keyword.

SELECT DISTINCT returns only distinct (different) values.
DISTINCT eliminates duplicate records from the table.
DISTINCT can be used with aggregates: COUNT, AVG, MAX, etc.
DISTINCT operates on a single column.
Multiple columns are not supported for DISTINCT.

A database is an organized collection of structured information, or data, typically stored electronically in a computer system. A database is usually controlled by a database management system (DBMS). Together, the data and the DBMS, along with the applications that are associated with them, are referred to as a database system, often shortened to just database.

Data within the most common types of databases in operation today is typically modeled in rows and columns in a series of tables to make processing and data querying efficient. The data can then be easily accessed, managed, modified, updated, controlled, and organized. Most databases use structured query language (SQL) for writing and querying data.
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