schema_auto_increment_columns Sys Schema View
MariaDB starting with 10.6
The Sys Schema was introduced in MariaDB 10.6
Description
Information about AUTO_INCREMENT columns, sorted by descending usage ratio and maximum column value. Does not include columns in the mysql, sys, information_schema and performance_schema schemas.
Contains the following columns:
Column | Description |
---|---|
table_schema | Schema name containing the table with the auto_increment attribute. |
table_name | Table containing the auto_increment attribute. |
column_name | Name of the column containing the auto_increment attribute. |
data_type | Data type of the auto_increment column, for example tinyint. |
column_type | Data type of the auto_increment column, plus additional information for example tinyint(3) unsigned . |
is_signed | 1 if the column is signed,0 if not. |
is_unsigned | 1 if the column is unsigned,0 if it is. |
max_value | Maximum possible value for the column, for example 255 for an unsigned tinyint. |
auto_increment | Current auto_increment value for the column. |
auto_increment_ratio | Ratio of used to maximum value for the auto_increment column. |
Example
CREATE OR REPLACE TABLE animals ( id TINYINT NOT NULL AUTO_INCREMENT, name CHAR(30) NOT NULL, PRIMARY KEY (id) ); INSERT INTO animals (name) VALUES ('dog'),('cat'),('penguin'), ('fox'),('whale'),('ostrich'); SELECT * FROM sys.schema_auto_increment_columns\G *************************** 1. row *************************** table_schema: test table_name: animals column_name: id data_type: tinyint column_type: tinyint(4) is_signed: 1 is_unsigned: 0 max_value: 127 auto_increment: 7 auto_increment_ratio: 0.0551
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