SHOW TABLES FROM information_schema LIKE 'KEY_COLUMN_USAGE';
Tables_in_information_schema (KEY_COLUMN_USAGE)
KEY_COLUMN_USAGE
#######################################################################
# Testcase 3.2.1.1: INFORMATION_SCHEMA tables can be queried via SELECT
#######################################################################
DROP VIEW      IF EXISTS test.v1;
DROP PROCEDURE IF EXISTS test.p1;
DROP FUNCTION  IF EXISTS test.f1;
CREATE VIEW test.v1 AS     SELECT * FROM information_schema.KEY_COLUMN_USAGE;
CREATE PROCEDURE test.p1() SELECT * FROM information_schema.KEY_COLUMN_USAGE;
CREATE FUNCTION test.f1() returns BIGINT
BEGIN
DECLARE counter BIGINT DEFAULT NULL;
SELECT COUNT(*) INTO counter FROM information_schema.KEY_COLUMN_USAGE;
RETURN counter;
END//
# Attention: The printing of the next result sets is disabled.
SELECT * FROM information_schema.KEY_COLUMN_USAGE;
SELECT * FROM test.v1;
CALL test.p1;
SELECT test.f1();
DROP VIEW test.v1;
DROP PROCEDURE test.p1;
DROP FUNCTION test.f1;
#########################################################################
# Testcase 3.2.7.1: INFORMATION_SCHEMA.KEY_COLUMN_USAGE layout
#########################################################################
DESCRIBE          information_schema.KEY_COLUMN_USAGE;
Field	Type	Null	Key	Default	Extra
CONSTRAINT_CATALOG	varchar(512)	YES		NULL	
CONSTRAINT_SCHEMA	varchar(64)	NO			
CONSTRAINT_NAME	varchar(64)	NO			
TABLE_CATALOG	varchar(512)	YES		NULL	
TABLE_SCHEMA	varchar(64)	NO			
TABLE_NAME	varchar(64)	NO			
COLUMN_NAME	varchar(64)	NO			
ORDINAL_POSITION	bigint(10)	NO		0	
POSITION_IN_UNIQUE_CONSTRAINT	bigint(10)	YES		NULL	
REFERENCED_TABLE_SCHEMA	varchar(64)	YES		NULL	
REFERENCED_TABLE_NAME	varchar(64)	YES		NULL	
REFERENCED_COLUMN_NAME	varchar(64)	YES		NULL	
SHOW CREATE TABLE information_schema.KEY_COLUMN_USAGE;
Table	Create Table
KEY_COLUMN_USAGE	CREATE TEMPORARY TABLE `KEY_COLUMN_USAGE` (
  `CONSTRAINT_CATALOG` varchar(512) DEFAULT NULL,
  `CONSTRAINT_SCHEMA` varchar(64) NOT NULL DEFAULT '',
  `CONSTRAINT_NAME` varchar(64) NOT NULL DEFAULT '',
  `TABLE_CATALOG` varchar(512) DEFAULT NULL,
  `TABLE_SCHEMA` varchar(64) NOT NULL DEFAULT '',
  `TABLE_NAME` varchar(64) NOT NULL DEFAULT '',
  `COLUMN_NAME` varchar(64) NOT NULL DEFAULT '',
  `ORDINAL_POSITION` bigint(10) NOT NULL DEFAULT '0',
  `POSITION_IN_UNIQUE_CONSTRAINT` bigint(10) DEFAULT NULL,
  `REFERENCED_TABLE_SCHEMA` varchar(64) DEFAULT NULL,
  `REFERENCED_TABLE_NAME` varchar(64) DEFAULT NULL,
  `REFERENCED_COLUMN_NAME` varchar(64) DEFAULT NULL
) ENGINE=MEMORY DEFAULT CHARSET=utf8
SHOW COLUMNS FROM information_schema.KEY_COLUMN_USAGE;
Field	Type	Null	Key	Default	Extra
CONSTRAINT_CATALOG	varchar(512)	YES		NULL	
CONSTRAINT_SCHEMA	varchar(64)	NO			
CONSTRAINT_NAME	varchar(64)	NO			
TABLE_CATALOG	varchar(512)	YES		NULL	
TABLE_SCHEMA	varchar(64)	NO			
TABLE_NAME	varchar(64)	NO			
COLUMN_NAME	varchar(64)	NO			
ORDINAL_POSITION	bigint(10)	NO		0	
POSITION_IN_UNIQUE_CONSTRAINT	bigint(10)	YES		NULL	
REFERENCED_TABLE_SCHEMA	varchar(64)	YES		NULL	
REFERENCED_TABLE_NAME	varchar(64)	YES		NULL	
REFERENCED_COLUMN_NAME	varchar(64)	YES		NULL	
SELECT constraint_catalog, constraint_schema, constraint_name, table_catalog,
table_schema, table_name, column_name
FROM information_schema.key_column_usage
WHERE constraint_catalog IS NOT NULL OR table_catalog IS NOT NULL;
constraint_catalog	constraint_schema	constraint_name	table_catalog	table_schema	table_name	column_name
########################################################################################
# Testcase 3.2.7.2 + 3.2.7.3: INFORMATION_SCHEMA.KEY_COLUMN_USAGE accessible information
########################################################################################
DROP DATABASE IF EXISTS db_datadict;
CREATE DATABASE db_datadict;
DROP   USER 'testuser1'@'localhost';
CREATE USER 'testuser1'@'localhost';
DROP   USER 'testuser2'@'localhost';
CREATE USER 'testuser2'@'localhost';
USE db_datadict;
CREATE TABLE t1_1
(f1 INT NOT NULL, PRIMARY KEY(f1),
f2 INT,          INDEX f2_ind(f2))
ENGINE = <engine_type>;
GRANT SELECT ON t1_1 to 'testuser1'@'localhost';
CREATE TABLE t1_2
(f1 INT NOT NULL, PRIMARY KEY(f1),
f2 INT,          INDEX f2_ind(f2))
ENGINE = <engine_type>;
GRANT SELECT ON t1_2 to 'testuser2'@'localhost';
SELECT * FROM information_schema.key_column_usage
WHERE table_name LIKE 't1_%'
ORDER BY constraint_catalog, constraint_schema, constraint_name,
table_catalog, table_schema, table_name, ordinal_position;
CONSTRAINT_CATALOG	CONSTRAINT_SCHEMA	CONSTRAINT_NAME	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	COLUMN_NAME	ORDINAL_POSITION	POSITION_IN_UNIQUE_CONSTRAINT	REFERENCED_TABLE_SCHEMA	REFERENCED_TABLE_NAME	REFERENCED_COLUMN_NAME
NULL	db_datadict	PRIMARY	NULL	db_datadict	t1_1	f1	1	NULL	NULL	NULL	NULL
NULL	db_datadict	PRIMARY	NULL	db_datadict	t1_2	f1	1	NULL	NULL	NULL	NULL
# Establish connection testuser1 (user=testuser1)
SELECT * FROM information_schema.key_column_usage
WHERE table_name LIKE 't1_%'
ORDER BY constraint_catalog, constraint_schema, constraint_name,
table_catalog, table_schema, table_name, ordinal_position;
CONSTRAINT_CATALOG	CONSTRAINT_SCHEMA	CONSTRAINT_NAME	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	COLUMN_NAME	ORDINAL_POSITION	POSITION_IN_UNIQUE_CONSTRAINT	REFERENCED_TABLE_SCHEMA	REFERENCED_TABLE_NAME	REFERENCED_COLUMN_NAME
NULL	db_datadict	PRIMARY	NULL	db_datadict	t1_1	f1	1	NULL	NULL	NULL	NULL
NULL	db_datadict	PRIMARY	NULL	db_datadict	t1_2	f1	1	NULL	NULL	NULL	NULL
# Establish connection testuser2 (user=testuser2)
SELECT * FROM information_schema.key_column_usage
WHERE table_name LIKE 't1_%'
ORDER BY constraint_catalog, constraint_schema, constraint_name,
table_catalog, table_schema, table_name, ordinal_position;
CONSTRAINT_CATALOG	CONSTRAINT_SCHEMA	CONSTRAINT_NAME	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	COLUMN_NAME	ORDINAL_POSITION	POSITION_IN_UNIQUE_CONSTRAINT	REFERENCED_TABLE_SCHEMA	REFERENCED_TABLE_NAME	REFERENCED_COLUMN_NAME
NULL	db_datadict	PRIMARY	NULL	db_datadict	t1_1	f1	1	NULL	NULL	NULL	NULL
NULL	db_datadict	PRIMARY	NULL	db_datadict	t1_2	f1	1	NULL	NULL	NULL	NULL
# Switch to connection default and close connections testuser1, testuser2
DROP USER 'testuser1'@'localhost';
DROP USER 'testuser2'@'localhost';
DROP TABLE t1_1;
DROP TABLE t1_2;
DROP DATABASE IF EXISTS db_datadict;
########################################################################################
# Testcase 3.2.1.13+3.2.1.14+3.2.1.15: INFORMATION_SCHEMA.KEY_COLUMN_USAGE modifications
########################################################################################
DROP DATABASE IF EXISTS db_datadict;
DROP TABLE IF EXISTS test.t1_my_table;
CREATE DATABASE db_datadict;
SELECT table_name FROM information_schema.key_column_usage
WHERE table_name LIKE 't1_my_table%';
table_name
CREATE TABLE test.t1_my_table
(f1 CHAR(12), f2 TIMESTAMP, f4 BIGINT, PRIMARY KEY(f1,f2))
DEFAULT CHARACTER SET latin1 COLLATE latin1_swedish_ci
ENGINE = <engine_type>;
SELECT * FROM information_schema.key_column_usage
WHERE table_name = 't1_my_table';
CONSTRAINT_CATALOG	NULL
CONSTRAINT_SCHEMA	test
CONSTRAINT_NAME	PRIMARY
TABLE_CATALOG	NULL
TABLE_SCHEMA	test
TABLE_NAME	t1_my_table
COLUMN_NAME	f1
ORDINAL_POSITION	1
POSITION_IN_UNIQUE_CONSTRAINT	NULL
REFERENCED_TABLE_SCHEMA	NULL
REFERENCED_TABLE_NAME	NULL
REFERENCED_COLUMN_NAME	NULL
CONSTRAINT_CATALOG	NULL
CONSTRAINT_SCHEMA	test
CONSTRAINT_NAME	PRIMARY
TABLE_CATALOG	NULL
TABLE_SCHEMA	test
TABLE_NAME	t1_my_table
COLUMN_NAME	f2
ORDINAL_POSITION	2
POSITION_IN_UNIQUE_CONSTRAINT	NULL
REFERENCED_TABLE_SCHEMA	NULL
REFERENCED_TABLE_NAME	NULL
REFERENCED_COLUMN_NAME	NULL
SELECT DISTINCT table_name FROM information_schema.key_column_usage
WHERE table_name LIKE 't1_my_table%';
table_name
t1_my_table
RENAME TABLE test.t1_my_table TO test.t1_my_tablex;
SELECT DISTINCT table_name FROM information_schema.key_column_usage
WHERE table_name LIKE 't1_my_table%';
table_name
t1_my_tablex
SELECT DISTINCT table_schema,table_name FROM information_schema.key_column_usage
WHERE table_name = 't1_my_tablex';
table_schema	table_name
test	t1_my_tablex
RENAME TABLE test.t1_my_tablex TO db_datadict.t1_my_tablex;
SELECT DISTINCT table_schema,table_name FROM information_schema.key_column_usage
WHERE table_name = 't1_my_tablex';
table_schema	table_name
db_datadict	t1_my_tablex
SELECT DISTINCT table_name, column_name FROM information_schema.key_column_usage
WHERE table_name = 't1_my_tablex'
ORDER BY table_name, column_name;
table_name	column_name
t1_my_tablex	f1
t1_my_tablex	f2
ALTER TABLE db_datadict.t1_my_tablex CHANGE COLUMN f1 first_col CHAR(12);
SELECT DISTINCT table_name, column_name FROM information_schema.key_column_usage
WHERE table_name = 't1_my_tablex'
ORDER BY table_name, column_name;
table_name	column_name
t1_my_tablex	f2
t1_my_tablex	first_col
SELECT constraint_schema, constraint_name, table_schema,
table_name, column_name, ordinal_position
FROM information_schema.key_column_usage
WHERE table_name = 't1_my_tablex'
ORDER BY constraint_schema, constraint_name, table_schema,
table_name, ordinal_position;
constraint_schema	constraint_name	table_schema	table_name	column_name	ordinal_position
db_datadict	PRIMARY	db_datadict	t1_my_tablex	first_col	1
db_datadict	PRIMARY	db_datadict	t1_my_tablex	f2	2
CREATE INDEX f2 ON db_datadict.t1_my_tablex(f2);
SELECT constraint_schema, constraint_name, table_schema,
table_name, column_name, ordinal_position
FROM information_schema.key_column_usage
WHERE table_name = 't1_my_tablex'
ORDER BY constraint_schema, constraint_name, table_schema,
table_name, ordinal_position;
constraint_schema	constraint_name	table_schema	table_name	column_name	ordinal_position
db_datadict	PRIMARY	db_datadict	t1_my_tablex	first_col	1
db_datadict	PRIMARY	db_datadict	t1_my_tablex	f2	2
DROP INDEX f2 ON db_datadict.t1_my_tablex;
SELECT constraint_schema, constraint_name, table_schema,
table_name, column_name, ordinal_position
FROM information_schema.key_column_usage
WHERE table_name = 't1_my_tablex'
ORDER BY constraint_schema, constraint_name, table_schema,
table_name, ordinal_position;
constraint_schema	constraint_name	table_schema	table_name	column_name	ordinal_position
db_datadict	PRIMARY	db_datadict	t1_my_tablex	first_col	1
db_datadict	PRIMARY	db_datadict	t1_my_tablex	f2	2
ALTER TABLE db_datadict.t1_my_tablex ADD UNIQUE (f2);
SELECT constraint_schema, constraint_name, table_schema,
table_name, column_name, ordinal_position
FROM information_schema.key_column_usage
WHERE table_name = 't1_my_tablex'
ORDER BY constraint_schema, constraint_name, table_schema,
table_name, ordinal_position;
constraint_schema	constraint_name	table_schema	table_name	column_name	ordinal_position
db_datadict	f2	db_datadict	t1_my_tablex	f2	1
db_datadict	PRIMARY	db_datadict	t1_my_tablex	first_col	1
db_datadict	PRIMARY	db_datadict	t1_my_tablex	f2	2
DROP INDEX f2 ON db_datadict.t1_my_tablex;
SELECT constraint_schema, constraint_name, table_schema,
table_name, column_name, ordinal_position
FROM information_schema.key_column_usage
WHERE table_name = 't1_my_tablex'
ORDER BY constraint_schema, constraint_name, table_schema,
table_name, ordinal_position;
constraint_schema	constraint_name	table_schema	table_name	column_name	ordinal_position
db_datadict	PRIMARY	db_datadict	t1_my_tablex	first_col	1
db_datadict	PRIMARY	db_datadict	t1_my_tablex	f2	2
ALTER TABLE db_datadict.t1_my_tablex ADD UNIQUE my_idx (f2);
SELECT constraint_schema, constraint_name, table_schema,
table_name, column_name, ordinal_position
FROM information_schema.key_column_usage
WHERE table_name = 't1_my_tablex'
ORDER BY constraint_schema, constraint_name, table_schema,
table_name, ordinal_position;
constraint_schema	constraint_name	table_schema	table_name	column_name	ordinal_position
db_datadict	my_idx	db_datadict	t1_my_tablex	f2	1
db_datadict	PRIMARY	db_datadict	t1_my_tablex	first_col	1
db_datadict	PRIMARY	db_datadict	t1_my_tablex	f2	2
DROP INDEX my_idx ON db_datadict.t1_my_tablex;
SELECT constraint_schema, constraint_name, table_schema,
table_name, column_name, ordinal_position
FROM information_schema.key_column_usage
WHERE table_name = 't1_my_tablex'
ORDER BY constraint_schema, constraint_name, table_schema,
table_name, ordinal_position;
constraint_schema	constraint_name	table_schema	table_name	column_name	ordinal_position
db_datadict	PRIMARY	db_datadict	t1_my_tablex	first_col	1
db_datadict	PRIMARY	db_datadict	t1_my_tablex	f2	2
ALTER TABLE db_datadict.t1_my_tablex ADD UNIQUE my_idx (f4,first_col);
SELECT constraint_schema, constraint_name, table_schema,
table_name, column_name, ordinal_position
FROM information_schema.key_column_usage
WHERE table_name = 't1_my_tablex'
ORDER BY constraint_schema, constraint_name, table_schema,
table_name, ordinal_position;
constraint_schema	constraint_name	table_schema	table_name	column_name	ordinal_position
db_datadict	my_idx	db_datadict	t1_my_tablex	f4	1
db_datadict	my_idx	db_datadict	t1_my_tablex	first_col	2
db_datadict	PRIMARY	db_datadict	t1_my_tablex	first_col	1
db_datadict	PRIMARY	db_datadict	t1_my_tablex	f2	2
SELECT constraint_schema, constraint_name, table_schema,
table_name, column_name, ordinal_position
FROM information_schema.key_column_usage
WHERE table_name = 't1_my_tablex'
ORDER BY constraint_schema, constraint_name, table_schema,
table_name, ordinal_position;
constraint_schema	constraint_name	table_schema	table_name	column_name	ordinal_position
db_datadict	my_idx	db_datadict	t1_my_tablex	f4	1
db_datadict	my_idx	db_datadict	t1_my_tablex	first_col	2
db_datadict	PRIMARY	db_datadict	t1_my_tablex	first_col	1
db_datadict	PRIMARY	db_datadict	t1_my_tablex	f2	2
ALTER TABLE db_datadict.t1_my_tablex
DROP COLUMN first_col;
SELECT constraint_schema, constraint_name, table_schema,
table_name, column_name, ordinal_position
FROM information_schema.key_column_usage
WHERE table_name = 't1_my_tablex'
ORDER BY constraint_schema, constraint_name, table_schema,
table_name, ordinal_position;
constraint_schema	constraint_name	table_schema	table_name	column_name	ordinal_position
db_datadict	my_idx	db_datadict	t1_my_tablex	f4	1
db_datadict	PRIMARY	db_datadict	t1_my_tablex	f2	1
SELECT table_name, column_name
FROM information_schema.key_column_usage
WHERE table_name = 't1_my_tablex'
ORDER BY table_name, column_name;
table_name	column_name
t1_my_tablex	f2
t1_my_tablex	f4
DROP TABLE db_datadict.t1_my_tablex;
SELECT table_name, column_name
FROM information_schema.key_column_usage
WHERE table_name = 't1_my_tablex';
table_name	column_name
SELECT table_name FROM information_schema.key_column_usage
WHERE table_name = 't1_my_tablex';
table_name
CREATE TABLE db_datadict.t1_my_tablex
ENGINE = <engine_type> AS
SELECT 1 AS f1;
SELECT table_name FROM information_schema.key_column_usage
WHERE table_name = 't1_my_tablex';
table_name
ALTER TABLE db_datadict.t1_my_tablex ADD PRIMARY KEY(f1);
SELECT table_name FROM information_schema.key_column_usage
WHERE table_name = 't1_my_tablex';
table_name
t1_my_tablex
SELECT table_name FROM information_schema.key_column_usage
WHERE table_name = 't1_my_tablex';
table_name
t1_my_tablex
DROP DATABASE db_datadict;
SELECT table_name FROM information_schema.key_column_usage
WHERE table_name = 't1_my_tablex';
table_name
########################################################################
# Testcases 3.2.1.3-3.2.1.5 + 3.2.1.8-3.2.1.12: INSERT/UPDATE/DELETE and
#           DDL on INFORMATION_SCHEMA table are not supported
########################################################################
DROP DATABASE IF EXISTS db_datadict;
DROP TABLE IF EXISTS db_datadict.t1;
CREATE DATABASE db_datadict;
CREATE TABLE db_datadict.t1 (f1 BIGINT)
ENGINE = <engine_type>;
INSERT INTO information_schema.key_column_usage
(constraint_schema, constraint_name, table_name)
VALUES (          'mysql',       'primary',       'db');
ERROR 42000: Access denied for user 'root'@'localhost' to database 'information_schema'
INSERT INTO information_schema.key_column_usage
SELECT * FROM information_schema.key_column_usage;
ERROR 42000: Access denied for user 'root'@'localhost' to database 'information_schema'
UPDATE information_schema.key_column_usage
SET  table_name = 'db1' WHERE constraint_name = 'primary';
ERROR 42000: Access denied for user 'root'@'localhost' to database 'information_schema'
DELETE FROM information_schema.key_column_usage WHERE table_name = 't1';
ERROR 42000: Access denied for user 'root'@'localhost' to database 'information_schema'
TRUNCATE information_schema.key_column_usage;
ERROR 42000: Access denied for user 'root'@'localhost' to database 'information_schema'
CREATE INDEX i3 ON information_schema.key_column_usage(table_name);
ERROR 42000: Access denied for user 'root'@'localhost' to database 'information_schema'
ALTER TABLE information_schema.key_column_usage ADD f1 INT;
ERROR 42000: Access denied for user 'root'@'localhost' to database 'information_schema'
DROP TABLE information_schema.key_column_usage;
ERROR 42000: Access denied for user 'root'@'localhost' to database 'information_schema'
ALTER TABLE information_schema.key_column_usage
RENAME db_datadict.key_column_usage;
ERROR 42000: Access denied for user 'root'@'localhost' to database 'information_schema'
ALTER TABLE information_schema.key_column_usage
RENAME information_schema.xkey_column_usage;
ERROR 42000: Access denied for user 'root'@'localhost' to database 'information_schema'
DROP TABLE db_datadict.t1;
DROP DATABASE db_datadict;