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information_schema.COLUMNS

更新时间：2023-07-18 17:25:58

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功能

记录列信息。

相关表/视图

OCEANBASE.__ALL_VIRTUAL_INFORMATION_COLUMNS

字段说明

字段名称	类型	是否可以为 NULL	描述
TABLE_CATALOG	varchar(4096)	NO	固定值（def）
TABLE_SCHEMA	varchar(128)	NO	Column 对应的表所属的库
TABLE_NAME	varchar(256)	NO	Column 对应的表名
COLUMN_NAME	varchar(128)	NO	列名
ORDINAL_POSITION	bigint(20) unsigned	NO	列编号
COLUMN_DEFAULT	varchar(262144)	YES	列默认值
IS_NULLABLE	varchar(4)	NO	列值是否可以为 NULL
DATA_TYPE	varchar(64)	NO	列中数据类型
CHARACTER_MAXIMUM_LENGTH	bigint(20) unsigned	YES	列的最大字符数
CHARACTER_OCTET_LENGTH	bigint(20) unsigned	YES	列的最大字节数
NUMERIC_PRECISION	bigint(20) unsigned	YES	数字精度
NUMERIC_SCALE	bigint(20) unsigned	YES	小数位数
DATETIME_PRECISION	bigint(20) unsigned	YES	datetime 类型精度
CHARACTER_SET_NAME	varchar(128)	YES	列对应字符集名称
COLLATION_NAME	varchar(128)	YES	字符集比对方法
COLUMN_TYPE	varchar(64)	NO	字段类型
COLUMN_KEY	varchar(3)	NO	索引或者主键列
EXTRA	varchar(4096)	NO	其它信息
PRIVILEGES	varchar(200)	NO	权限信息
COLUMN_COMMENT	varchar(2048)	NO	注释
GENERATION_EXPRESSION	varchar(262144)	NO	对于生成的列，显示用于计算列值的表达式。对于非生成列为空。

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