PostgreSQL version numbers

For PostgreSQL versions 10 and later, the engine version number is in the form major.minor. The major version number is the integer part of the version number. The minor version number is the fractional part of the version number.

A major version upgrade increases the integer part of the version number, such as upgrading from 10.minor to 11.minor.

For PostgreSQL versions earlier than 10, the engine version number is in the form major.major.minor. The major engine version number is both the integer and the first fractional part of the version number. For example, 9.6 is a major version. The minor version number is the third part of the version number. For example, for version 9.6.12, the 12 is the minor version number.

A major version upgrade increases the major part of the version number. For example, an upgrade from 9.6.12 to 11.14 is a major version upgrade, where 9.6 and 11 are the major version numbers.