column_stats

This page is part of MariaDB's MariaDB Documentation.

The parent of this page is: System Tables for MariaDB Enterprise Server

Topics on this page:

Overview
DETAILS
- SCHEMA
CHANGE HISTORY
EXTERNAL REFERENCES

Overview

Statistics on Columns

DETAILS

SCHEMA

CREATE TABLE `column_stats` (
  `db_name` varchar(64) NOT NULL,
  `table_name` varchar(64) NOT NULL,
  `column_name` varchar(64) NOT NULL,
  `min_value` varbinary(255) DEFAULT NULL,
  `max_value` varbinary(255) DEFAULT NULL,
  `nulls_ratio` decimal(12,4) DEFAULT NULL,
  `avg_length` decimal(12,4) DEFAULT NULL,
  `avg_frequency` decimal(12,4) DEFAULT NULL,
  `hist_size` tinyint(3) unsigned DEFAULT NULL,
  `hist_type` enum('SINGLE_PREC_HB','DOUBLE_PREC_HB') DEFAULT NULL,
  `histogram` varbinary(255) DEFAULT NULL,
  PRIMARY KEY (`db_name`,`table_name`,`column_name`)
)

CHANGE HISTORY

Release Series	History
10.6 Enterprise	Schema changed in MariaDB Enterprise Server 10.6.4-1: ... CREATE TABLE `column_stats` ( `db_name` varchar(64) COLLATE utf8_binutf8mb3_bin NOT NULL, `table_name` varchar(64) COLLATE utf8_binutf8mb3_bin NOT NULL, `column_name` varchar(64) COLLATE utf8_binutf8mb3_bin NOT NULL, `min_value` varbinary(255) DEFAULT NULL, `max_value` varbinary(255) DEFAULT NULL, `nulls_ratio` decimal(12,4) DEFAULT NULL, `avg_length` decimal(12,4) DEFAULT NULL, `avg_frequency` decimal(12,4) DEFAULT NULL, `hist_size` tinyint(3) unsigned DEFAULT NULL, `hist_type` enum('SINGLE_PREC_HB','DOUBLE_PREC_HB') COLLATE utf8_binutf8mb3_bin DEFAULT NULL, `histogram` varbinary(255) DEFAULT NULL, PRIMARY KEY (`db_name`,`table_name`,`column_name`) ) Schema changed in MariaDB Enterprise Server 10.6.11-6: ... CREATE TABLE `column_stats` ( `db_name` varchar(64) COLLATE utf8mb3_bin NOT NULL, `table_name` varchar(64) COLLATE utf8mb3_bin NOT NULL, `column_name` varchar(64) COLLATE utf8mb3_bin NOT NULL, `min_value` varbinary(255) DEFAULT NULL, `max_value` varbinary(255) DEFAULT NULL, `nulls_ratio` decimal(12,4) DEFAULT NULL, `avg_length` decimal(12,4) DEFAULT NULL, `avg_frequency` decimal(12,4) DEFAULT NULL, `hist_size` tinyint(3) unsigned DEFAULT NULL, `hist_type` enum('SINGLE_PREC_HB','DOUBLE_PREC_HB') COLLATE utf8mb3_bin DEFAULT NULL, `histogram` varbinary(255) DEFAULT NULL, PRIMARY KEY (`db_name`,`table_name`,`column_name`) )
10.6 Community	Present starting in MariaDB Community Server 10.6.0. Schema changed in MariaDB Community Server 10.6.1: ... CREATE TABLE `column_stats` ( `db_name` varchar(64) COLLATE utf8_binutf8mb3_bin NOT NULL, `table_name` varchar(64) COLLATE utf8_binutf8mb3_bin NOT NULL, `column_name` varchar(64) COLLATE utf8_binutf8mb3_bin NOT NULL, `min_value` varbinary(255) DEFAULT NULL, `max_value` varbinary(255) DEFAULT NULL, `nulls_ratio` decimal(12,4) DEFAULT NULL, `avg_length` decimal(12,4) DEFAULT NULL, `avg_frequency` decimal(12,4) DEFAULT NULL, `hist_size` tinyint(3) unsigned DEFAULT NULL, `hist_type` enum('SINGLE_PREC_HB','DOUBLE_PREC_HB') COLLATE utf8_binutf8mb3_bin DEFAULT NULL, `histogram` varbinary(255) DEFAULT NULL, PRIMARY KEY (`db_name`,`table_name`,`column_name`) )
10.5 Enterprise	Present starting in MariaDB Enterprise Server 10.5.3-1. Schema changed in MariaDB Enterprise Server 10.5.18-13: ... CREATE TABLE `column_stats` ( `db_name` varchar(64) COLLATE utf8_bin NOT NULL, `table_name` varchar(64) COLLATE utf8_bin NOT NULL, `column_name` varchar(64) COLLATE utf8_bin NOT NULL, `min_value` varbinary(255) DEFAULT NULL, `max_value` varbinary(255) DEFAULT NULL, `nulls_ratio` decimal(12,4) DEFAULT NULL, `avg_length` decimal(12,4) DEFAULT NULL, `avg_frequency` decimal(12,4) DEFAULT NULL, `hist_size` tinyint(3) unsigned DEFAULT NULL, `hist_type` enum('SINGLE_PREC_HB','DOUBLE_PREC_HB') COLLATE utf8_bin DEFAULT NULL, `histogram` varbinary(255) DEFAULT NULL, PRIMARY KEY (`db_name`,`table_name`,`column_name`) )
10.5 Community	Present starting in MariaDB Community Server 10.5.0.
10.4 Enterprise	Present starting in MariaDB Enterprise Server 10.4.6-1. Schema changed in MariaDB Enterprise Server 10.4.27-18: ... CREATE TABLE `column_stats` ( `db_name` varchar(64) COLLATE utf8_bin NOT NULL, `table_name` varchar(64) COLLATE utf8_bin NOT NULL, `column_name` varchar(64) COLLATE utf8_bin NOT NULL, `min_value` varbinary(255) DEFAULT NULL, `max_value` varbinary(255) DEFAULT NULL, `nulls_ratio` decimal(12,4) DEFAULT NULL, `avg_length` decimal(12,4) DEFAULT NULL, `avg_frequency` decimal(12,4) DEFAULT NULL, `hist_size` tinyint(3) unsigned DEFAULT NULL, `hist_type` enum('SINGLE_PREC_HB','DOUBLE_PREC_HB') COLLATE utf8_bin DEFAULT NULL, `histogram` varbinary(255) DEFAULT NULL, PRIMARY KEY (`db_name`,`table_name`,`column_name`) )
10.4 Community	Present starting in MariaDB Community Server 10.4.0.
10.3 Enterprise	Present starting in MariaDB Enterprise Server 10.3.16-1. Schema changed in MariaDB Enterprise Server 10.3.37-18: ... CREATE TABLE `column_stats` ( `db_name` varchar(64) COLLATE utf8_bin NOT NULL, `table_name` varchar(64) COLLATE utf8_bin NOT NULL, `column_name` varchar(64) COLLATE utf8_bin NOT NULL, `min_value` varbinary(255) DEFAULT NULL, `max_value` varbinary(255) DEFAULT NULL, `nulls_ratio` decimal(12,4) DEFAULT NULL, `avg_length` decimal(12,4) DEFAULT NULL, `avg_frequency` decimal(12,4) DEFAULT NULL, `hist_size` tinyint(3) unsigned DEFAULT NULL, `hist_type` enum('SINGLE_PREC_HB','DOUBLE_PREC_HB') COLLATE utf8_bin DEFAULT NULL, `histogram` varbinary(255) DEFAULT NULL, PRIMARY KEY (`db_name`,`table_name`,`column_name`) )
10.3 Community	Present starting in MariaDB Community Server 10.3.0.
10.2 Enterprise	Present starting in MariaDB Enterprise Server 10.2.25-1.
10.2 Community	Present starting in MariaDB Community Server 10.2.0.

Release Series	History
10.6 Enterprise	Schema changed in MariaDB Enterprise Server 10.6.4-1: ... CREATE TABLE `column_stats` ( `db_name` varchar(64) COLLATE utf8_binutf8mb3_bin NOT NULL, `table_name` varchar(64) COLLATE utf8_binutf8mb3_bin NOT NULL, `column_name` varchar(64) COLLATE utf8_binutf8mb3_bin NOT NULL, `min_value` varbinary(255) DEFAULT NULL, `max_value` varbinary(255) DEFAULT NULL, `nulls_ratio` decimal(12,4) DEFAULT NULL, `avg_length` decimal(12,4) DEFAULT NULL, `avg_frequency` decimal(12,4) DEFAULT NULL, `hist_size` tinyint(3) unsigned DEFAULT NULL, `hist_type` enum('SINGLE_PREC_HB','DOUBLE_PREC_HB') COLLATE utf8_binutf8mb3_bin DEFAULT NULL, `histogram` varbinary(255) DEFAULT NULL, PRIMARY KEY (`db_name`,`table_name`,`column_name`) ) Schema changed in MariaDB Enterprise Server 10.6.11-6: ... CREATE TABLE `column_stats` ( `db_name` varchar(64) COLLATE utf8mb3_bin NOT NULL, `table_name` varchar(64) COLLATE utf8mb3_bin NOT NULL, `column_name` varchar(64) COLLATE utf8mb3_bin NOT NULL, `min_value` varbinary(255) DEFAULT NULL, `max_value` varbinary(255) DEFAULT NULL, `nulls_ratio` decimal(12,4) DEFAULT NULL, `avg_length` decimal(12,4) DEFAULT NULL, `avg_frequency` decimal(12,4) DEFAULT NULL, `hist_size` tinyint(3) unsigned DEFAULT NULL, `hist_type` enum('SINGLE_PREC_HB','DOUBLE_PREC_HB') COLLATE utf8mb3_bin DEFAULT NULL, `histogram` varbinary(255) DEFAULT NULL, PRIMARY KEY (`db_name`,`table_name`,`column_name`) )
10.5 Enterprise	Present starting in MariaDB Enterprise Server 10.5.3-1. Schema changed in MariaDB Enterprise Server 10.5.18-13: ... CREATE TABLE `column_stats` ( `db_name` varchar(64) COLLATE utf8_bin NOT NULL, `table_name` varchar(64) COLLATE utf8_bin NOT NULL, `column_name` varchar(64) COLLATE utf8_bin NOT NULL, `min_value` varbinary(255) DEFAULT NULL, `max_value` varbinary(255) DEFAULT NULL, `nulls_ratio` decimal(12,4) DEFAULT NULL, `avg_length` decimal(12,4) DEFAULT NULL, `avg_frequency` decimal(12,4) DEFAULT NULL, `hist_size` tinyint(3) unsigned DEFAULT NULL, `hist_type` enum('SINGLE_PREC_HB','DOUBLE_PREC_HB') COLLATE utf8_bin DEFAULT NULL, `histogram` varbinary(255) DEFAULT NULL, PRIMARY KEY (`db_name`,`table_name`,`column_name`) )
10.4 Enterprise	Present starting in MariaDB Enterprise Server 10.4.6-1. Schema changed in MariaDB Enterprise Server 10.4.27-18: ... CREATE TABLE `column_stats` ( `db_name` varchar(64) COLLATE utf8_bin NOT NULL, `table_name` varchar(64) COLLATE utf8_bin NOT NULL, `column_name` varchar(64) COLLATE utf8_bin NOT NULL, `min_value` varbinary(255) DEFAULT NULL, `max_value` varbinary(255) DEFAULT NULL, `nulls_ratio` decimal(12,4) DEFAULT NULL, `avg_length` decimal(12,4) DEFAULT NULL, `avg_frequency` decimal(12,4) DEFAULT NULL, `hist_size` tinyint(3) unsigned DEFAULT NULL, `hist_type` enum('SINGLE_PREC_HB','DOUBLE_PREC_HB') COLLATE utf8_bin DEFAULT NULL, `histogram` varbinary(255) DEFAULT NULL, PRIMARY KEY (`db_name`,`table_name`,`column_name`) )

EXTERNAL REFERENCES

Additional information on this topic may be found in the MariaDB Public Knowledge Base.