use INFORMATION_SCHEMA;
show tables;
Tables_in_information_schema
ALL_PLUGINS
APPLICABLE_ROLES
CHARACTER_SETS
CHECK_CONSTRAINTS
CLIENT_STATISTICS
COLLATIONS
COLLATION_CHARACTER_SET_APPLICABILITY
COLUMNS
COLUMN_PRIVILEGES
ENABLED_ROLES
ENGINES
EVENTS
FILES
GEOMETRY_COLUMNS
GLOBAL_STATUS
GLOBAL_VARIABLES
INDEX_STATISTICS
INNODB_BUFFER_PAGE
INNODB_BUFFER_PAGE_LRU
INNODB_BUFFER_POOL_STATS
INNODB_CMP
INNODB_CMPMEM
INNODB_CMPMEM_RESET
INNODB_CMP_PER_INDEX
INNODB_CMP_RESET
INNODB_LOCKS
INNODB_LOCK_WAITS
INNODB_METRICS
INNODB_SYS_COLUMNS
INNODB_SYS_FIELDS
INNODB_SYS_FOREIGN
INNODB_SYS_FOREIGN_COLS
INNODB_SYS_INDEXES
INNODB_SYS_TABLES
INNODB_SYS_TABLESTATS
INNODB_SYS_VIRTUAL
INNODB_TABLESPACES_ENCRYPTION
INNODB_TRX
KEYWORDS
KEY_CACHES
KEY_COLUMN_USAGE
KEY_PERIOD_USAGE
OPTIMIZER_COSTS
OPTIMIZER_TRACE
PARAMETERS
PARTITIONS
PERIODS
PLUGINS
PROCESSLIST
PROFILING
REFERENTIAL_CONSTRAINTS
ROUTINES
SCHEMATA
SCHEMA_PRIVILEGES
SESSION_STATUS
SESSION_VARIABLES
SPATIAL_REF_SYS
SQL_FUNCTIONS
STATISTICS
SYSTEM_VARIABLES
TABLES
TABLESPACES
TABLE_CONSTRAINTS
TABLE_PRIVILEGES
TABLE_STATISTICS
TRIGGERS
USER_PRIVILEGES
USER_STATISTICS
VIEWS
SELECT t.table_name, c1.column_name
FROM information_schema.tables t
INNER JOIN
information_schema.columns c1
ON t.table_schema = c1.table_schema AND
t.table_name = c1.table_name
WHERE t.table_schema = 'information_schema' AND
c1.ordinal_position =
( SELECT COALESCE(MIN(c2.ordinal_position),1)
FROM information_schema.columns c2
WHERE c2.table_schema = t.table_schema AND
c2.table_name = t.table_name AND
c2.column_name LIKE '%SCHEMA%'
        ) order by t.table_name;
table_name	column_name
ALL_PLUGINS	PLUGIN_NAME
APPLICABLE_ROLES	GRANTEE
CHARACTER_SETS	CHARACTER_SET_NAME
CHECK_CONSTRAINTS	CONSTRAINT_SCHEMA
CLIENT_STATISTICS	CLIENT
COLLATIONS	COLLATION_NAME
COLLATION_CHARACTER_SET_APPLICABILITY	COLLATION_NAME
COLUMNS	TABLE_SCHEMA
COLUMN_PRIVILEGES	TABLE_SCHEMA
ENABLED_ROLES	ROLE_NAME
ENGINES	ENGINE
EVENTS	EVENT_SCHEMA
FILES	TABLE_SCHEMA
GEOMETRY_COLUMNS	F_TABLE_SCHEMA
GLOBAL_STATUS	VARIABLE_NAME
GLOBAL_VARIABLES	VARIABLE_NAME
INDEX_STATISTICS	TABLE_SCHEMA
INNODB_BUFFER_PAGE	POOL_ID
INNODB_BUFFER_PAGE_LRU	POOL_ID
INNODB_BUFFER_POOL_STATS	POOL_ID
INNODB_CMP	page_size
INNODB_CMPMEM	page_size
INNODB_CMPMEM_RESET	page_size
INNODB_CMP_PER_INDEX	database_name
INNODB_CMP_RESET	page_size
INNODB_LOCKS	lock_id
INNODB_LOCK_WAITS	requesting_trx_id
INNODB_METRICS	NAME
INNODB_SYS_COLUMNS	TABLE_ID
INNODB_SYS_FIELDS	INDEX_ID
INNODB_SYS_FOREIGN	ID
INNODB_SYS_FOREIGN_COLS	ID
INNODB_SYS_INDEXES	INDEX_ID
INNODB_SYS_TABLES	TABLE_ID
INNODB_SYS_TABLESTATS	TABLE_ID
INNODB_SYS_VIRTUAL	TABLE_ID
INNODB_TABLESPACES_ENCRYPTION	SPACE
INNODB_TRX	trx_id
KEYWORDS	WORD
KEY_CACHES	KEY_CACHE_NAME
KEY_COLUMN_USAGE	CONSTRAINT_SCHEMA
KEY_PERIOD_USAGE	CONSTRAINT_SCHEMA
OPTIMIZER_COSTS	ENGINE
OPTIMIZER_TRACE	QUERY
PARAMETERS	SPECIFIC_SCHEMA
PARTITIONS	TABLE_SCHEMA
PERIODS	TABLE_SCHEMA
PLUGINS	PLUGIN_NAME
PROCESSLIST	ID
PROFILING	QUERY_ID
REFERENTIAL_CONSTRAINTS	CONSTRAINT_SCHEMA
ROUTINES	ROUTINE_SCHEMA
SCHEMATA	SCHEMA_NAME
SCHEMA_PRIVILEGES	TABLE_SCHEMA
SESSION_STATUS	VARIABLE_NAME
SESSION_VARIABLES	VARIABLE_NAME
SPATIAL_REF_SYS	SRID
SQL_FUNCTIONS	FUNCTION
STATISTICS	TABLE_SCHEMA
SYSTEM_VARIABLES	VARIABLE_NAME
TABLES	TABLE_SCHEMA
TABLESPACES	TABLESPACE_NAME
TABLE_CONSTRAINTS	CONSTRAINT_SCHEMA
TABLE_PRIVILEGES	TABLE_SCHEMA
TABLE_STATISTICS	TABLE_SCHEMA
TRIGGERS	TRIGGER_SCHEMA
USER_PRIVILEGES	GRANTEE
USER_STATISTICS	USER
VIEWS	TABLE_SCHEMA
SELECT t.table_name, c1.column_name
FROM information_schema.tables t
INNER JOIN
information_schema.columns c1
ON t.table_schema = c1.table_schema AND
t.table_name = c1.table_name
WHERE t.table_schema = 'information_schema' AND
c1.ordinal_position =
( SELECT COALESCE(MIN(c2.ordinal_position),1)
FROM information_schema.columns c2
WHERE c2.table_schema = 'information_schema' AND
c2.table_name = t.table_name AND
c2.column_name LIKE '%SCHEMA%'
        ) order by t.table_name;
table_name	column_name
ALL_PLUGINS	PLUGIN_NAME
APPLICABLE_ROLES	GRANTEE
CHARACTER_SETS	CHARACTER_SET_NAME
CHECK_CONSTRAINTS	CONSTRAINT_SCHEMA
CLIENT_STATISTICS	CLIENT
COLLATIONS	COLLATION_NAME
COLLATION_CHARACTER_SET_APPLICABILITY	COLLATION_NAME
COLUMNS	TABLE_SCHEMA
COLUMN_PRIVILEGES	TABLE_SCHEMA
ENABLED_ROLES	ROLE_NAME
ENGINES	ENGINE
EVENTS	EVENT_SCHEMA
FILES	TABLE_SCHEMA
GEOMETRY_COLUMNS	F_TABLE_SCHEMA
GLOBAL_STATUS	VARIABLE_NAME
GLOBAL_VARIABLES	VARIABLE_NAME
INDEX_STATISTICS	TABLE_SCHEMA
INNODB_BUFFER_PAGE	POOL_ID
INNODB_BUFFER_PAGE_LRU	POOL_ID
INNODB_BUFFER_POOL_STATS	POOL_ID
INNODB_CMP	page_size
INNODB_CMPMEM	page_size
INNODB_CMPMEM_RESET	page_size
INNODB_CMP_PER_INDEX	database_name
INNODB_CMP_RESET	page_size
INNODB_LOCKS	lock_id
INNODB_LOCK_WAITS	requesting_trx_id
INNODB_METRICS	NAME
INNODB_SYS_COLUMNS	TABLE_ID
INNODB_SYS_FIELDS	INDEX_ID
INNODB_SYS_FOREIGN	ID
INNODB_SYS_FOREIGN_COLS	ID
INNODB_SYS_INDEXES	INDEX_ID
INNODB_SYS_TABLES	TABLE_ID
INNODB_SYS_TABLESTATS	TABLE_ID
INNODB_SYS_VIRTUAL	TABLE_ID
INNODB_TABLESPACES_ENCRYPTION	SPACE
INNODB_TRX	trx_id
KEYWORDS	WORD
KEY_CACHES	KEY_CACHE_NAME
KEY_COLUMN_USAGE	CONSTRAINT_SCHEMA
KEY_PERIOD_USAGE	CONSTRAINT_SCHEMA
OPTIMIZER_COSTS	ENGINE
OPTIMIZER_TRACE	QUERY
PARAMETERS	SPECIFIC_SCHEMA
PARTITIONS	TABLE_SCHEMA
PERIODS	TABLE_SCHEMA
PLUGINS	PLUGIN_NAME
PROCESSLIST	ID
PROFILING	QUERY_ID
REFERENTIAL_CONSTRAINTS	CONSTRAINT_SCHEMA
ROUTINES	ROUTINE_SCHEMA
SCHEMATA	SCHEMA_NAME
SCHEMA_PRIVILEGES	TABLE_SCHEMA
SESSION_STATUS	VARIABLE_NAME
SESSION_VARIABLES	VARIABLE_NAME
SPATIAL_REF_SYS	SRID
SQL_FUNCTIONS	FUNCTION
STATISTICS	TABLE_SCHEMA
SYSTEM_VARIABLES	VARIABLE_NAME
TABLES	TABLE_SCHEMA
TABLESPACES	TABLESPACE_NAME
TABLE_CONSTRAINTS	CONSTRAINT_SCHEMA
TABLE_PRIVILEGES	TABLE_SCHEMA
TABLE_STATISTICS	TABLE_SCHEMA
TRIGGERS	TRIGGER_SCHEMA
USER_PRIVILEGES	GRANTEE
USER_STATISTICS	USER
VIEWS	TABLE_SCHEMA
select 1 as "must be 1" from information_schema.tables  where "ACCOUNTS"=
(select cast(table_name as char)  from information_schema.tables
order by table_name limit 1) limit 1;
must be 1
1
select t.table_name, group_concat(t.table_schema, '.', t.table_name),
count(*) as num1
from information_schema.tables t
inner join information_schema.columns c1
on t.table_schema = c1.table_schema AND t.table_name = c1.table_name
where t.table_schema = 'information_schema' and
c1.ordinal_position =
(select isnull(c2.column_type) -
isnull(group_concat(c2.table_schema, '.', c2.table_name)) +
count(*) as num
from information_schema.columns c2 where
c2.table_schema='information_schema' and
(c2.column_type = 'varchar(7)' or c2.column_type = 'varchar(20)')
group by c2.column_type order by num limit 1)
group by t.table_name order by num1, t.table_name;
table_name	group_concat(t.table_schema, '.', t.table_name)	num1
ALL_PLUGINS	information_schema.ALL_PLUGINS	1
APPLICABLE_ROLES	information_schema.APPLICABLE_ROLES	1
CHARACTER_SETS	information_schema.CHARACTER_SETS	1
CHECK_CONSTRAINTS	information_schema.CHECK_CONSTRAINTS	1
CLIENT_STATISTICS	information_schema.CLIENT_STATISTICS	1
COLLATIONS	information_schema.COLLATIONS	1
COLLATION_CHARACTER_SET_APPLICABILITY	information_schema.COLLATION_CHARACTER_SET_APPLICABILITY	1
COLUMNS	information_schema.COLUMNS	1
COLUMN_PRIVILEGES	information_schema.COLUMN_PRIVILEGES	1
ENGINES	information_schema.ENGINES	1
EVENTS	information_schema.EVENTS	1
FILES	information_schema.FILES	1
GEOMETRY_COLUMNS	information_schema.GEOMETRY_COLUMNS	1
GLOBAL_STATUS	information_schema.GLOBAL_STATUS	1
GLOBAL_VARIABLES	information_schema.GLOBAL_VARIABLES	1
INDEX_STATISTICS	information_schema.INDEX_STATISTICS	1
INNODB_BUFFER_PAGE	information_schema.INNODB_BUFFER_PAGE	1
INNODB_BUFFER_PAGE_LRU	information_schema.INNODB_BUFFER_PAGE_LRU	1
INNODB_BUFFER_POOL_STATS	information_schema.INNODB_BUFFER_POOL_STATS	1
INNODB_CMP	information_schema.INNODB_CMP	1
INNODB_CMPMEM	information_schema.INNODB_CMPMEM	1
INNODB_CMPMEM_RESET	information_schema.INNODB_CMPMEM_RESET	1
INNODB_CMP_PER_INDEX	information_schema.INNODB_CMP_PER_INDEX	1
INNODB_CMP_RESET	information_schema.INNODB_CMP_RESET	1
INNODB_LOCKS	information_schema.INNODB_LOCKS	1
INNODB_LOCK_WAITS	information_schema.INNODB_LOCK_WAITS	1
INNODB_METRICS	information_schema.INNODB_METRICS	1
INNODB_SYS_COLUMNS	information_schema.INNODB_SYS_COLUMNS	1
INNODB_SYS_FIELDS	information_schema.INNODB_SYS_FIELDS	1
INNODB_SYS_FOREIGN	information_schema.INNODB_SYS_FOREIGN	1
INNODB_SYS_FOREIGN_COLS	information_schema.INNODB_SYS_FOREIGN_COLS	1
INNODB_SYS_INDEXES	information_schema.INNODB_SYS_INDEXES	1
INNODB_SYS_TABLES	information_schema.INNODB_SYS_TABLES	1
INNODB_SYS_TABLESTATS	information_schema.INNODB_SYS_TABLESTATS	1
INNODB_SYS_VIRTUAL	information_schema.INNODB_SYS_VIRTUAL	1
INNODB_TABLESPACES_ENCRYPTION	information_schema.INNODB_TABLESPACES_ENCRYPTION	1
INNODB_TRX	information_schema.INNODB_TRX	1
KEY_CACHES	information_schema.KEY_CACHES	1
KEY_COLUMN_USAGE	information_schema.KEY_COLUMN_USAGE	1
KEY_PERIOD_USAGE	information_schema.KEY_PERIOD_USAGE	1
OPTIMIZER_COSTS	information_schema.OPTIMIZER_COSTS	1
OPTIMIZER_TRACE	information_schema.OPTIMIZER_TRACE	1
PARAMETERS	information_schema.PARAMETERS	1
PARTITIONS	information_schema.PARTITIONS	1
PERIODS	information_schema.PERIODS	1
PLUGINS	information_schema.PLUGINS	1
PROCESSLIST	information_schema.PROCESSLIST	1
PROFILING	information_schema.PROFILING	1
REFERENTIAL_CONSTRAINTS	information_schema.REFERENTIAL_CONSTRAINTS	1
ROUTINES	information_schema.ROUTINES	1
SCHEMATA	information_schema.SCHEMATA	1
SCHEMA_PRIVILEGES	information_schema.SCHEMA_PRIVILEGES	1
SESSION_STATUS	information_schema.SESSION_STATUS	1
SESSION_VARIABLES	information_schema.SESSION_VARIABLES	1
SPATIAL_REF_SYS	information_schema.SPATIAL_REF_SYS	1
STATISTICS	information_schema.STATISTICS	1
SYSTEM_VARIABLES	information_schema.SYSTEM_VARIABLES	1
TABLES	information_schema.TABLES	1
TABLESPACES	information_schema.TABLESPACES	1
TABLE_CONSTRAINTS	information_schema.TABLE_CONSTRAINTS	1
TABLE_PRIVILEGES	information_schema.TABLE_PRIVILEGES	1
TABLE_STATISTICS	information_schema.TABLE_STATISTICS	1
TRIGGERS	information_schema.TRIGGERS	1
USER_PRIVILEGES	information_schema.USER_PRIVILEGES	1
USER_STATISTICS	information_schema.USER_STATISTICS	1
VIEWS	information_schema.VIEWS	1
+---------------------------------------+
+---------------------------------------+
+---------------------------------------+
Database: information_schema
|                Tables                 |
| ALL_PLUGINS                           |
| APPLICABLE_ROLES                      |
| CHARACTER_SETS                        |
| CHECK_CONSTRAINTS                     |
| CLIENT_STATISTICS                     |
| COLLATIONS                            |
| COLLATION_CHARACTER_SET_APPLICABILITY |
| COLUMNS                               |
| COLUMN_PRIVILEGES                     |
| ENABLED_ROLES                         |
| ENGINES                               |
| EVENTS                                |
| FILES                                 |
| GEOMETRY_COLUMNS                      |
| GLOBAL_STATUS                         |
| GLOBAL_VARIABLES                      |
| INDEX_STATISTICS                      |
| INNODB_BUFFER_PAGE                    |
| INNODB_BUFFER_PAGE_LRU                |
| INNODB_BUFFER_POOL_STATS              |
| INNODB_CMP                            |
| INNODB_CMPMEM                         |
| INNODB_CMPMEM_RESET                   |
| INNODB_CMP_PER_INDEX                  |
| INNODB_CMP_RESET                      |
| INNODB_LOCKS                          |
| INNODB_LOCK_WAITS                     |
| INNODB_METRICS                        |
| INNODB_SYS_COLUMNS                    |
| INNODB_SYS_FIELDS                     |
| INNODB_SYS_FOREIGN                    |
| INNODB_SYS_FOREIGN_COLS               |
| INNODB_SYS_INDEXES                    |
| INNODB_SYS_TABLES                     |
| INNODB_SYS_TABLESTATS                 |
| INNODB_SYS_VIRTUAL                    |
| INNODB_TABLESPACES_ENCRYPTION         |
| INNODB_TRX                            |
| KEYWORDS                              |
| KEY_CACHES                            |
| KEY_COLUMN_USAGE                      |
| KEY_PERIOD_USAGE                      |
| OPTIMIZER_COSTS                       |
| OPTIMIZER_TRACE                       |
| PARAMETERS                            |
| PARTITIONS                            |
| PERIODS                               |
| PLUGINS                               |
| PROCESSLIST                           |
| PROFILING                             |
| REFERENTIAL_CONSTRAINTS               |
| ROUTINES                              |
| SCHEMATA                              |
| SCHEMA_PRIVILEGES                     |
| SESSION_STATUS                        |
| SESSION_VARIABLES                     |
| SPATIAL_REF_SYS                       |
| SQL_FUNCTIONS                         |
| STATISTICS                            |
| SYSTEM_VARIABLES                      |
| TABLES                                |
| TABLESPACES                           |
| TABLE_CONSTRAINTS                     |
| TABLE_PRIVILEGES                      |
| TABLE_STATISTICS                      |
| TRIGGERS                              |
| USER_PRIVILEGES                       |
| USER_STATISTICS                       |
| VIEWS                                 |
+---------------------------------------+
+---------------------------------------+
+---------------------------------------+
Database: INFORMATION_SCHEMA
|                Tables                 |
| ALL_PLUGINS                           |
| APPLICABLE_ROLES                      |
| CHARACTER_SETS                        |
| CHECK_CONSTRAINTS                     |
| CLIENT_STATISTICS                     |
| COLLATIONS                            |
| COLLATION_CHARACTER_SET_APPLICABILITY |
| COLUMNS                               |
| COLUMN_PRIVILEGES                     |
| ENABLED_ROLES                         |
| ENGINES                               |
| EVENTS                                |
| FILES                                 |
| GEOMETRY_COLUMNS                      |
| GLOBAL_STATUS                         |
| GLOBAL_VARIABLES                      |
| INDEX_STATISTICS                      |
| INNODB_BUFFER_PAGE                    |
| INNODB_BUFFER_PAGE_LRU                |
| INNODB_BUFFER_POOL_STATS              |
| INNODB_CMP                            |
| INNODB_CMPMEM                         |
| INNODB_CMPMEM_RESET                   |
| INNODB_CMP_PER_INDEX                  |
| INNODB_CMP_RESET                      |
| INNODB_LOCKS                          |
| INNODB_LOCK_WAITS                     |
| INNODB_METRICS                        |
| INNODB_SYS_COLUMNS                    |
| INNODB_SYS_FIELDS                     |
| INNODB_SYS_FOREIGN                    |
| INNODB_SYS_FOREIGN_COLS               |
| INNODB_SYS_INDEXES                    |
| INNODB_SYS_TABLES                     |
| INNODB_SYS_TABLESTATS                 |
| INNODB_SYS_VIRTUAL                    |
| INNODB_TABLESPACES_ENCRYPTION         |
| INNODB_TRX                            |
| KEYWORDS                              |
| KEY_CACHES                            |
| KEY_COLUMN_USAGE                      |
| KEY_PERIOD_USAGE                      |
| OPTIMIZER_COSTS                       |
| OPTIMIZER_TRACE                       |
| PARAMETERS                            |
| PARTITIONS                            |
| PERIODS                               |
| PLUGINS                               |
| PROCESSLIST                           |
| PROFILING                             |
| REFERENTIAL_CONSTRAINTS               |
| ROUTINES                              |
| SCHEMATA                              |
| SCHEMA_PRIVILEGES                     |
| SESSION_STATUS                        |
| SESSION_VARIABLES                     |
| SPATIAL_REF_SYS                       |
| SQL_FUNCTIONS                         |
| STATISTICS                            |
| SYSTEM_VARIABLES                      |
| TABLES                                |
| TABLESPACES                           |
| TABLE_CONSTRAINTS                     |
| TABLE_PRIVILEGES                      |
| TABLE_STATISTICS                      |
| TRIGGERS                              |
| USER_PRIVILEGES                       |
| USER_STATISTICS                       |
| VIEWS                                 |
+--------------------+
+--------------------+
+--------------------+
Wildcard: inf_rmation_schema
|     Databases      |
| information_schema |
SELECT table_schema, count(*) FROM information_schema.TABLES WHERE table_schema IN ('mysql', 'INFORMATION_SCHEMA', 'test', 'mysqltest') GROUP BY TABLE_SCHEMA;
table_schema	count(*)
information_schema	69
mysql	31
