Database information_schema - table KEY_COLUMN_USAGE

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Field Type Attributes Null Default Extra Action
CONSTRAINT_CATALOG  varchar(512)   Yes  NULL    Change Drop Primary Index Unique
CONSTRAINT_SCHEMA  varchar(64)   Yes      Change Drop Primary Index Unique
CONSTRAINT_NAME  varchar(64)   Yes      Change Drop Primary Index Unique
TABLE_CATALOG  varchar(512)   Yes  NULL    Change Drop Primary Index Unique
TABLE_SCHEMA  varchar(64)   Yes      Change Drop Primary Index Unique
TABLE_NAME  varchar(64)   Yes      Change Drop Primary Index Unique
COLUMN_NAME  varchar(64)   Yes      Change Drop Primary Index Unique
ORDINAL_POSITION  bigint(10)   Yes    Change Drop Primary Index Unique
POSITION_IN_UNIQUE_CONSTRAINT  bigint(10)   Yes  NULL    Change Drop Primary Index Unique
REFERENCED_TABLE_SCHEMA  varchar(64)   Yes  NULL    Change Drop Primary Index Unique
REFERENCED_TABLE_NAME  varchar(64)   Yes  NULL    Change Drop Primary Index Unique
REFERENCED_COLUMN_NAME  varchar(64)   Yes  NULL    Change Drop Primary Index Unique