pg_column_compression

Shows the compression algorithm that was used to compress an individual variable-length value. Returns NULL if the value is not compressed.

English manual coverage begins with PostgreSQL 7.1. Source history and runtime observations have their own recorded version boundaries.

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group: admin
group label: 系统管理函数
lang: en
layout: table-new
pages: functions-admin.html
prose only: false

Definition PG 18

Shows the compression algorithm that was used to compress an individual variable-length value. Returns NULL if the value is not compressed.

Signatures and overloads

pg_column_compression ( "any" ) → text → text

Shows the compression algorithm that was used to compress an individual variable-length value. Returns NULL if the value is not compressed.

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Complete source facts

documentation revision

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Source references

Original manual reference

Full definition and evidence JSON

Definition sources

center · PostgreSQL 18 · wiki-repair-20261023:83e1932017e245680f6211d14298fa1d873604f4df493e5ca86e0bb1720de0c4

Text language: en · wiki-repair-20261023:83e1932017e245680f6211d14298fa1d873604f4df493e5ca86e0bb1720de0c4