information_schema.result 26.4 KB
Newer Older
1 2 3
show variables where variable_name like "skip_show_database";
Variable_name	Value
skip_show_database	OFF
4 5
grant select, update, execute on test.* to mysqltest_2@localhost;
grant select, update on test.* to mysqltest_1@localhost;
6
select * from information_schema.SCHEMATA where schema_name > 'm';
7 8 9
CATALOG_NAME	SCHEMA_NAME	DEFAULT_CHARACTER_SET_NAME	DEFAULT_COLLATION_NAME	SQL_PATH
NULL	mysql	latin1	latin1_swedish_ci	NULL
NULL	test	latin1	latin1_swedish_ci	NULL
10 11
select schema_name from information_schema.schemata;
schema_name
12
information_schema
13 14 15 16 17 18 19
mysql
test
show databases like 't%';
Database (t%)
test
show databases;
Database
20
information_schema
21 22
mysql
test
23 24
show databases where `database` = 't%';
Database
25 26
create database mysqltest;
create table mysqltest.t1(a int, b VARCHAR(30), KEY string_data (b));
27 28
create table test.t2(a int);
create table t3(a int, KEY a_data (a));
29
create table mysqltest.t4(a int);
30 31 32
create view v1 (c) as select table_name from information_schema.TABLES;
select * from v1;
c
33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
SCHEMATA
TABLES
COLUMNS
CHARACTER_SETS
COLLATIONS
COLLATION_CHARACTER_SET_APPLICABILITY
ROUTINES
STATISTICS
VIEWS
USER_PRIVILEGES
SCHEMA_PRIVILEGES
TABLE_PRIVILEGES
COLUMN_PRIVILEGES
TABLE_CONSTRAINTS
KEY_COLUMN_USAGE
48 49 50 51 52 53 54 55 56
columns_priv
db
func
help_category
help_keyword
help_relation
help_topic
host
proc
57
procs_priv
58 59 60 61 62 63 64
tables_priv
time_zone
time_zone_leap_second
time_zone_name
time_zone_transition
time_zone_transition_type
user
65 66
t1
t4
67 68 69 70
t2
t3
v1
select c,table_name from v1 
71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87
inner join information_schema.TABLES v2 on (v1.c=v2.table_name)
where v1.c like "t%";
c	table_name
TABLES	TABLES
TABLE_PRIVILEGES	TABLE_PRIVILEGES
TABLE_CONSTRAINTS	TABLE_CONSTRAINTS
tables_priv	tables_priv
time_zone	time_zone
time_zone_leap_second	time_zone_leap_second
time_zone_name	time_zone_name
time_zone_transition	time_zone_transition
time_zone_transition_type	time_zone_transition_type
t1	t1
t4	t4
t2	t2
t3	t3
select c,table_name from v1 
88 89 90
left join information_schema.TABLES v2 on (v1.c=v2.table_name)
where v1.c like "t%";
c	table_name
91 92 93
TABLES	TABLES
TABLE_PRIVILEGES	TABLE_PRIVILEGES
TABLE_CONSTRAINTS	TABLE_CONSTRAINTS
94 95 96 97 98 99 100 101
tables_priv	tables_priv
time_zone	time_zone
time_zone_leap_second	time_zone_leap_second
time_zone_name	time_zone_name
time_zone_transition	time_zone_transition
time_zone_transition_type	time_zone_transition_type
t1	t1
t4	t4
102 103
t2	t2
t3	t3
104 105 106 107
select c, v2.table_name from v1
right join information_schema.TABLES v2 on (v1.c=v2.table_name)
where v1.c like "t%";
c	table_name
108 109 110
TABLES	TABLES
TABLE_PRIVILEGES	TABLE_PRIVILEGES
TABLE_CONSTRAINTS	TABLE_CONSTRAINTS
111 112 113 114 115 116 117 118
tables_priv	tables_priv
time_zone	time_zone
time_zone_leap_second	time_zone_leap_second
time_zone_name	time_zone_name
time_zone_transition	time_zone_transition
time_zone_transition_type	time_zone_transition_type
t1	t1
t4	t4
119 120
t2	t2
t3	t3
121
select table_name from information_schema.TABLES
122
where table_schema = "mysqltest" and table_name like "t%";
123 124 125
table_name
t1
t4
126
select * from information_schema.STATISTICS where TABLE_SCHEMA = "mysqltest";
127
TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	NON_UNIQUE	INDEX_SCHEMA	INDEX_NAME	SEQ_IN_INDEX	COLUMN_NAME	COLLATION	CARDINALITY	SUB_PART	PACKED	NULLABLE	INDEX_TYPE	COMMENT
128
NULL	mysqltest	t1	1	mysqltest	string_data	1	b	A	NULL	NULL	NULL	YES	BTREE	
129
show keys from t3 where Key_name = "a_data";
130 131 132 133 134 135 136 137
Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment
t3	1	a_data	1	a	A	NULL	NULL	NULL	YES	BTREE	
show tables like 't%';
Tables_in_test (t%)
t2
t3
show table status;
Name	Engine	Version	Row_format	Rows	Avg_row_length	Data_length	Max_data_length	Index_length	Data_free	Auto_increment	Create_time	Update_time	Check_time	Collation	Checksum	Create_options	Comment
138 139
t2	MyISAM	10	Fixed	0	0	0	#	1024	0	NULL	#	#	NULL	latin1_swedish_ci	NULL		
t3	MyISAM	10	Fixed	0	0	0	#	1024	0	NULL	#	#	NULL	latin1_swedish_ci	NULL		
140
v1	NULL	NULL	NULL	NULL	NULL	NULL	#	NULL	NULL	NULL	#	#	NULL	NULL	NULL	NULL	view
141 142 143 144 145
show full columns from t3 like "a%";
Field	Type	Collation	Null	Key	Default	Extra	Privileges	Comment
a	int(11)	NULL	YES	MUL	NULL		select,insert,update,references	
show full columns from mysql.db like "Insert%";
Field	Type	Collation	Null	Key	Default	Extra	Privileges	Comment
146
Insert_priv	enum('N','Y')	utf8_general_ci	NO		N		select,insert,update,references	
147 148
show full columns from v1;
Field	Type	Collation	Null	Key	Default	Extra	Privileges	Comment
149
c	varchar(64)	utf8_general_ci	NO				select,insert,update,references	
150 151
select * from information_schema.COLUMNS where table_name="t1"
and column_name= "a";
152
TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	COLUMN_NAME	ORDINAL_POSITION	COLUMN_DEFAULT	IS_NULLABLE	DATA_TYPE	CHARACTER_MAXIMUM_LENGTH	CHARACTER_OCTET_LENGTH	NUMERIC_PRECISION	NUMERIC_SCALE	CHARACTER_SET_NAME	COLLATION_NAME	COLUMN_TYPE	COLUMN_KEY	EXTRA	PRIVILEGES	COLUMN_COMMENT
153 154 155 156 157 158 159 160 161 162
NULL	mysqltest	t1	a	1	NULL	YES	int	NULL	NULL	11	0	NULL	NULL	int(11)			select,insert,update,references	
show columns from mysqltest.t1 where field like "%a%";
Field	Type	Null	Key	Default	Extra
a	int(11)	YES		NULL	
grant select (a) on mysqltest.t1 to mysqltest_2@localhost;
select table_name, column_name, privileges from information_schema.columns 
where table_schema = 'mysqltest' and table_name = 't1';
table_name	column_name	privileges
t1	a	select
show columns from mysqltest.t1;
163 164
Field	Type	Null	Key	Default	Extra
a	int(11)	YES		NULL	
165
b	varchar(30)	YES	MUL	NULL	
166
drop view v1;
167 168
drop tables mysqltest.t4, mysqltest.t1, t2, t3;
drop database mysqltest;
169 170
select * from information_schema.CHARACTER_SETS
where CHARACTER_SET_NAME like 'latin1%';
171 172
CHARACTER_SET_NAME	DEFAULT_COLLATE_NAME	DESCRIPTION	MAXLEN
latin1	latin1_swedish_ci	ISO 8859-1 West European	1
173 174 175
SHOW CHARACTER SET LIKE 'latin1%';
Charset	Description	Default collation	Maxlen
latin1	ISO 8859-1 West European	latin1_swedish_ci	1
176
SHOW CHARACTER SET WHERE charset like 'latin1%';
177 178 179 180
Charset	Description	Default collation	Maxlen
latin1	ISO 8859-1 West European	latin1_swedish_ci	1
select * from information_schema.COLLATIONS
where COLLATION_NAME like 'latin1%';
181
COLLATION_NAME	CHARACTER_SET_NAME	ID	IS_DEFAULT	IS_COMPILED	SORTLEN
182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199
latin1_german1_ci	latin1	5			0
latin1_swedish_ci	latin1	8	Yes	Yes	1
latin1_danish_ci	latin1	15			0
latin1_german2_ci	latin1	31		Yes	2
latin1_bin	latin1	47		Yes	1
latin1_general_ci	latin1	48			0
latin1_general_cs	latin1	49			0
latin1_spanish_ci	latin1	94			0
SHOW COLLATION LIKE 'latin1%';
Collation	Charset	Id	Default	Compiled	Sortlen
latin1_german1_ci	latin1	5			0
latin1_swedish_ci	latin1	8	Yes	Yes	1
latin1_danish_ci	latin1	15			0
latin1_german2_ci	latin1	31		Yes	2
latin1_bin	latin1	47		Yes	1
latin1_general_ci	latin1	48			0
latin1_general_cs	latin1	49			0
latin1_spanish_ci	latin1	94			0
200
SHOW COLLATION WHERE collation like 'latin1%';
201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227
Collation	Charset	Id	Default	Compiled	Sortlen
latin1_german1_ci	latin1	5			0
latin1_swedish_ci	latin1	8	Yes	Yes	1
latin1_danish_ci	latin1	15			0
latin1_german2_ci	latin1	31		Yes	2
latin1_bin	latin1	47		Yes	1
latin1_general_ci	latin1	48			0
latin1_general_cs	latin1	49			0
latin1_spanish_ci	latin1	94			0
select * from information_schema.COLLATION_CHARACTER_SET_APPLICABILITY
where COLLATION_NAME like 'latin1%';
COLLATION_NAME	CHARACTER_SET_NAME
latin1_german1_ci	latin1
latin1_swedish_ci	latin1
latin1_danish_ci	latin1
latin1_german2_ci	latin1
latin1_bin	latin1
latin1_general_ci	latin1
latin1_general_cs	latin1
latin1_spanish_ci	latin1
create function sub1(i int) returns int
return i+1;
create procedure sel2()
begin
select * from t1;
select * from t2;
end|
228 229 230 231
select parameter_style, sql_data_access, dtd_identifier 
from information_schema.routines;
parameter_style	sql_data_access	dtd_identifier
SQL	CONTAINS SQL	NULL
232
SQL	CONTAINS SQL	int(11)
233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251
show procedure status;
Db	Name	Type	Definer	Modified	Created	Security_type	Comment
test	sel2	PROCEDURE	root@localhost	#	#	DEFINER	
show function status;
Db	Name	Type	Definer	Modified	Created	Security_type	Comment
test	sub1	FUNCTION	root@localhost	#	#	DEFINER	
select a.ROUTINE_NAME from information_schema.ROUTINES a,
information_schema.SCHEMATA b where
a.ROUTINE_SCHEMA = b.SCHEMA_NAME;
ROUTINE_NAME
sel2
sub1
explain select a.ROUTINE_NAME from information_schema.ROUTINES a,
information_schema.SCHEMATA b where
a.ROUTINE_SCHEMA = b.SCHEMA_NAME;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	#	ALL	NULL	NULL	NULL	NULL	2	
1	SIMPLE	#	ALL	NULL	NULL	NULL	NULL	2	Using where
select a.ROUTINE_NAME, b.name from information_schema.ROUTINES a,
252
mysql.proc b where a.ROUTINE_NAME = convert(b.name using utf8);
253 254 255 256 257 258
ROUTINE_NAME	name
sub1	sub1
sel2	sel2
select count(*) from information_schema.ROUTINES;
count(*)
2
259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286
select ROUTINE_NAME, ROUTINE_DEFINITION from information_schema.ROUTINES;
ROUTINE_NAME	ROUTINE_DEFINITION
show create function sub1;
ERROR 42000: FUNCTION sub1 does not exist
select ROUTINE_NAME, ROUTINE_DEFINITION from information_schema.ROUTINES;
ROUTINE_NAME	ROUTINE_DEFINITION
sel2	
sub1	
grant all privileges on test.* to mysqltest_1@localhost;
select ROUTINE_NAME, ROUTINE_DEFINITION from information_schema.ROUTINES;
ROUTINE_NAME	ROUTINE_DEFINITION
sel2	
sub1	
create function sub2(i int) returns int
return i+1;
select ROUTINE_NAME, ROUTINE_DEFINITION from information_schema.ROUTINES;
ROUTINE_NAME	ROUTINE_DEFINITION
sel2	
sub1	
sub2	return i+1
show create procedure sel2;
Procedure	sql_mode	Create Procedure
sel2		
show create function sub1;
Function	sql_mode	Create Function
sub1		
show create function sub2;
Function	sql_mode	Create Function
287
sub2		CREATE FUNCTION `test`.`sub2`(i int) RETURNS int(11)
288 289 290 291 292 293 294 295 296
return i+1
drop function sub2;
show create procedure sel2;
Procedure	sql_mode	Create Procedure
sel2		CREATE PROCEDURE `test`.`sel2`()
begin
select * from t1;
select * from t2;
end
297
create view v0 (c) as select schema_name from information_schema.schemata;
298 299
select * from v0;
c
300
information_schema
301 302 303 304 305
mysql
test
explain select * from v0;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	#	ALL	NULL	NULL	NULL	NULL	2	
306
create view v1 (c) as select table_name from information_schema.tables
307 308 309 310
where table_name="v1";
select * from v1;
c
v1
311
create view v2 (c) as select column_name from information_schema.columns
312 313 314 315
where table_name="v2";
select * from v2;
c
c
316
create view v3 (c) as select CHARACTER_SET_NAME from information_schema.character_sets
317 318 319 320
where CHARACTER_SET_NAME like "latin1%";
select * from v3;
c
latin1
321
create view v4 (c) as select COLLATION_NAME from information_schema.collations
322 323 324 325 326 327 328 329 330 331 332 333 334
where COLLATION_NAME like "latin1%";
select * from v4;
c
latin1_german1_ci
latin1_swedish_ci
latin1_danish_ci
latin1_german2_ci
latin1_bin
latin1_general_ci
latin1_general_cs
latin1_spanish_ci
show keys from v4;
Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment
335
select * from information_schema.views where TABLE_NAME like "v%";
336
TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	VIEW_DEFINITION	CHECK_OPTION	IS_UPDATABLE
337 338 339 340 341
NULL	test	v0	select sql_no_cache `schemata`.`SCHEMA_NAME` AS `c` from `information_schema`.`schemata`	NONE	NO
NULL	test	v1	select sql_no_cache `tables`.`TABLE_NAME` AS `c` from `information_schema`.`tables` where (`tables`.`TABLE_NAME` = _utf8'v1')	NONE	NO
NULL	test	v2	select sql_no_cache `columns`.`COLUMN_NAME` AS `c` from `information_schema`.`columns` where (`columns`.`TABLE_NAME` = _utf8'v2')	NONE	NO
NULL	test	v3	select sql_no_cache `character_sets`.`CHARACTER_SET_NAME` AS `c` from `information_schema`.`character_sets` where (`character_sets`.`CHARACTER_SET_NAME` like _utf8'latin1%')	NONE	NO
NULL	test	v4	select sql_no_cache `collations`.`COLLATION_NAME` AS `c` from `information_schema`.`collations` where (`collations`.`COLLATION_NAME` like _utf8'latin1%')	NONE	NO
342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362
drop view v0, v1, v2, v3, v4;
create table t1 (a int);
grant select,update,insert on t1 to mysqltest_1@localhost;
grant select (a), update (a),insert(a), references(a) on t1 to mysqltest_1@localhost;
grant all on test.* to mysqltest_1@localhost with grant option;
select * from information_schema.USER_PRIVILEGES where grantee like '%mysqltest_1%';
GRANTEE	TABLE_CATALOG	PRIVILEGE_TYPE	IS_GRANTABLE
'mysqltest_1'@'localhost'	NULL	USAGE	NO
select * from information_schema.SCHEMA_PRIVILEGES where grantee like '%mysqltest_1%';
GRANTEE	TABLE_CATALOG	TABLE_SCHEMA	PRIVILEGE_TYPE	IS_GRANTABLE
'mysqltest_1'@'localhost'	NULL	test	SELECT	YES
'mysqltest_1'@'localhost'	NULL	test	INSERT	YES
'mysqltest_1'@'localhost'	NULL	test	UPDATE	YES
'mysqltest_1'@'localhost'	NULL	test	DELETE	YES
'mysqltest_1'@'localhost'	NULL	test	CREATE	YES
'mysqltest_1'@'localhost'	NULL	test	DROP	YES
'mysqltest_1'@'localhost'	NULL	test	REFERENCES	YES
'mysqltest_1'@'localhost'	NULL	test	INDEX	YES
'mysqltest_1'@'localhost'	NULL	test	ALTER	YES
'mysqltest_1'@'localhost'	NULL	test	CREATE TEMPORARY TABLES	YES
'mysqltest_1'@'localhost'	NULL	test	LOCK TABLES	YES
363
'mysqltest_1'@'localhost'	NULL	test	EXECUTE	YES
364 365
'mysqltest_1'@'localhost'	NULL	test	CREATE VIEW	YES
'mysqltest_1'@'localhost'	NULL	test	SHOW VIEW	YES
366 367
'mysqltest_1'@'localhost'	NULL	test	CREATE ROUTINE	YES
'mysqltest_1'@'localhost'	NULL	test	ALTER ROUTINE	YES
368 369 370 371 372 373 374 375 376 377 378
select * from information_schema.TABLE_PRIVILEGES where grantee like '%mysqltest_1%';
GRANTEE	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	PRIVILEGE_TYPE	IS_GRANTABLE
'mysqltest_1'@'localhost'	NULL	test	t1	SELECT	NO
'mysqltest_1'@'localhost'	NULL	test	t1	INSERT	NO
'mysqltest_1'@'localhost'	NULL	test	t1	UPDATE	NO
select * from information_schema.COLUMN_PRIVILEGES where grantee like '%mysqltest_1%';
GRANTEE	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	COLUMN_NAME	PRIVILEGE_TYPE	IS_GRANTABLE
'mysqltest_1'@'localhost'	NULL	test	t1	a	SELECT	NO
'mysqltest_1'@'localhost'	NULL	test	t1	a	INSERT	NO
'mysqltest_1'@'localhost'	NULL	test	t1	a	UPDATE	NO
'mysqltest_1'@'localhost'	NULL	test	t1	a	REFERENCES	NO
379 380
delete from mysql.user where user='mysqltest_1' or user='mysqltest_2';
delete from mysql.db where user='mysqltest_1' or user='mysqltest_2';
381 382
delete from mysql.tables_priv where user='mysqltest_1' or user='mysqltest_2';
delete from mysql.columns_priv where user='mysqltest_1' or user='mysqltest_2';
383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399
flush privileges;
drop table t1;
create table t1 (a int null, primary key(a));
alter table t1 add constraint constraint_1 unique (a);
alter table t1 add constraint unique key_1(a);
alter table t1 add constraint constraint_2 unique key_2(a);
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) NOT NULL default '0',
  PRIMARY KEY  (`a`),
  UNIQUE KEY `constraint_1` (`a`),
  UNIQUE KEY `key_1` (`a`),
  UNIQUE KEY `key_2` (`a`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
select * from information_schema.TABLE_CONSTRAINTS where
TABLE_SCHEMA= "test";
400 401 402 403 404
CONSTRAINT_CATALOG	CONSTRAINT_SCHEMA	CONSTRAINT_NAME	TABLE_SCHEMA	TABLE_NAME	CONSTRAINT_TYPE
NULL	test	PRIMARY	test	t1	PRIMARY KEY
NULL	test	constraint_1	test	t1	UNIQUE
NULL	test	key_1	test	t1	UNIQUE
NULL	test	key_2	test	t1	UNIQUE
405 406
select * from information_schema.KEY_COLUMN_USAGE where
TABLE_SCHEMA= "test";
407 408 409 410 411
CONSTRAINT_CATALOG	CONSTRAINT_SCHEMA	CONSTRAINT_NAME	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	COLUMN_NAME	ORDINAL_POSITION	POSITION_IN_UNIQUE_CONSTRAINT
NULL	test	PRIMARY	NULL	test	t1	a	1	NULL
NULL	test	constraint_1	NULL	test	t1	a	1	NULL
NULL	test	key_1	NULL	test	t1	a	1	NULL
NULL	test	key_2	NULL	test	t1	a	1	NULL
412 413 414 415 416
select table_name from information_schema.TABLES where table_schema like "test%";
table_name
t1
select table_name,column_name from information_schema.COLUMNS where table_schema like "test%";
table_name	column_name
417
t1	a
418 419 420 421 422 423 424 425
select ROUTINE_NAME from information_schema.ROUTINES;
ROUTINE_NAME
sel2
sub1
delete from mysql.user where user='mysqltest_1';
drop table t1;
drop procedure sel2;
drop function sub1;
426 427 428 429 430 431
create table t1(a int);
create view v1 (c) as select a from t1 with check option;
create view v2 (c) as select a from t1 WITH LOCAL CHECK OPTION;
create view v3 (c) as select a from t1 WITH CASCADED CHECK OPTION;
select * from information_schema.views;
TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	VIEW_DEFINITION	CHECK_OPTION	IS_UPDATABLE
432 433 434
NULL	test	v1	select `test`.`t1`.`a` AS `c` from `test`.`t1`	CASCADED	YES
NULL	test	v2	select `test`.`t1`.`a` AS `c` from `test`.`t1`	LOCAL	YES
NULL	test	v3	select `test`.`t1`.`a` AS `c` from `test`.`t1`	CASCADED	YES
435 436 437 438 439 440 441 442 443 444 445 446 447
grant select (a) on test.t1 to joe@localhost with grant option;
select * from INFORMATION_SCHEMA.COLUMN_PRIVILEGES;
GRANTEE	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	COLUMN_NAME	PRIVILEGE_TYPE	IS_GRANTABLE
'joe'@'localhost'	NULL	test	t1	a	SELECT	YES
select * from INFORMATION_SCHEMA.TABLE_PRIVILEGES;
GRANTEE	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	PRIVILEGE_TYPE	IS_GRANTABLE
drop view v1, v2, v3;
drop table t1;
delete from mysql.user where user='joe';
delete from mysql.db where user='joe';
delete from mysql.tables_priv where user='joe';
delete from mysql.columns_priv where user='joe';
flush privileges;
448 449 450 451 452 453
create table t1 (a int not null auto_increment,b int, primary key (a));
insert into t1 values (1,1),(NULL,3),(NULL,4);
select AUTO_INCREMENT from information_schema.tables where table_name = 't1';
AUTO_INCREMENT
4
drop table t1;
454 455 456 457 458 459
create table t1 (s1 int);
insert into t1 values (0),(9),(0);
select s1 from t1 where s1 in (select version from
information_schema.tables) union select version from
information_schema.tables;
s1
460
0
461
10
462
drop table t1;
463
SHOW CREATE TABLE INFORMATION_SCHEMA.character_sets;
464
Table	Create Table
465
character_sets	CREATE TEMPORARY TABLE `character_sets` (
466 467
  `CHARACTER_SET_NAME` varchar(64) NOT NULL default '',
  `DEFAULT_COLLATE_NAME` varchar(64) NOT NULL default '',
468
  `DESCRIPTION` varchar(60) NOT NULL default '',
469
  `MAXLEN` bigint(3) NOT NULL default '0'
470
) ENGINE=MEMORY DEFAULT CHARSET=utf8
471
set names latin2;
472
SHOW CREATE TABLE INFORMATION_SCHEMA.character_sets;
473
Table	Create Table
474
character_sets	CREATE TEMPORARY TABLE `character_sets` (
475 476
  `CHARACTER_SET_NAME` varchar(64) NOT NULL default '',
  `DEFAULT_COLLATE_NAME` varchar(64) NOT NULL default '',
477
  `DESCRIPTION` varchar(60) NOT NULL default '',
478
  `MAXLEN` bigint(3) NOT NULL default '0'
479
) ENGINE=MEMORY DEFAULT CHARSET=utf8
480 481 482 483
set names latin1;
create table t1 select * from information_schema.CHARACTER_SETS
where CHARACTER_SET_NAME like "latin1";
select * from t1;
484 485
CHARACTER_SET_NAME	DEFAULT_COLLATE_NAME	DESCRIPTION	MAXLEN
latin1	latin1_swedish_ci	ISO 8859-1 West European	1
486 487 488 489
alter table t1 default character set utf8;
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
490 491
  `CHARACTER_SET_NAME` varchar(64) NOT NULL default '',
  `DEFAULT_COLLATE_NAME` varchar(64) NOT NULL default '',
492
  `DESCRIPTION` varchar(60) NOT NULL default '',
493
  `MAXLEN` bigint(3) NOT NULL default '0'
494 495
) ENGINE=MyISAM DEFAULT CHARSET=utf8
drop table t1;
496 497 498 499 500 501 502 503 504
create view v1 as select * from information_schema.TABLES;
drop view v1;
create table t1(a NUMERIC(5,3), b NUMERIC(5,1), c float(5,2),
d NUMERIC(6,4), e float, f DECIMAL(6,3), g int(11), h DOUBLE(10,3),
i DOUBLE);
select COLUMN_NAME,COLUMN_TYPE, CHARACTER_MAXIMUM_LENGTH, 
CHARACTER_OCTET_LENGTH, NUMERIC_PRECISION, NUMERIC_SCALE
from information_schema.columns where table_name= 't1';
COLUMN_NAME	COLUMN_TYPE	CHARACTER_MAXIMUM_LENGTH	CHARACTER_OCTET_LENGTH	NUMERIC_PRECISION	NUMERIC_SCALE
505 506 507 508 509 510 511 512 513
a	decimal(5,3)	NULL	NULL	5	3
b	decimal(5,1)	NULL	NULL	5	1
c	float(5,2)	NULL	NULL	5	2
d	decimal(6,4)	NULL	NULL	6	4
e	float	NULL	NULL	12	NULL
f	decimal(6,3)	NULL	NULL	6	3
g	int(11)	NULL	NULL	11	0
h	double(10,3)	NULL	NULL	10	3
i	double	NULL	NULL	22	NULL
514
drop table t1;
515 516 517 518
create table t115 as select table_name, column_name, column_type
from information_schema.columns where table_name = 'proc';
select * from t115;
table_name	column_name	column_type
519 520
proc	db	char(64)
proc	name	char(64)
521
proc	type	enum('FUNCTION','PROCEDURE')
522
proc	specific_name	char(64)
523 524 525 526 527
proc	language	enum('SQL')
proc	sql_data_access	enum('CONTAINS_SQL','NO_SQL','READS_SQL_DATA','MODIFIES_SQL_DATA')
proc	is_deterministic	enum('YES','NO')
proc	security_type	enum('INVOKER','DEFINER')
proc	param_list	blob
528
proc	returns	char(64)
529
proc	body	blob
530
proc	definer	char(77)
531 532
proc	created	timestamp
proc	modified	timestamp
533
proc	sql_mode	set('REAL_AS_FLOAT','PIPES_AS_CONCAT','ANSI_QUOTES','IGNORE_SPACE','NOT_USED','ONLY_FULL_GROUP_BY','NO_UNSIGNED_SUBTRACTION','NO_DIR_IN_CREATE','POSTGRESQL','ORACLE','MSSQL','DB2','MAXDB','NO_KEY_OPTIONS','NO_TABLE_OPTIONS','NO_FIELD_OPTIONS','MYSQL323','MYSQL40','ANSI','NO_AUTO_VALUE_ON_ZERO','NO_BACKSLASH_ESCAPES','STRICT_TRANS_TABLES','STRICT_ALL_TABLES','NO_ZERO_IN_DATE','NO_ZERO_DATE','INVALID_DATES','ERROR_FOR_DIVISION_BY_ZERO','TRADITIONAL','NO_AUTO_CREATE_USER','HIGH_NOT_PRECEDENCE')
534
proc	comment	char(64)
535 536 537 538 539 540
drop table t115;
create procedure p108 () begin declare c cursor for select data_type
from information_schema.columns;  open c; open c; end;//
call p108()//
ERROR 24000: Cursor is already open
drop procedure p108;
541 542 543 544 545 546 547 548 549 550 551
create view v1 as select A1.table_name from information_schema.TABLES A1
where table_name= "user";
select * from v1;
table_name
user
drop view v1;
create view vo as select 'a' union select 'a';
show index from vo;
Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment
select * from information_schema.TABLE_CONSTRAINTS where
TABLE_NAME= "vo";
552
CONSTRAINT_CATALOG	CONSTRAINT_SCHEMA	CONSTRAINT_NAME	TABLE_SCHEMA	TABLE_NAME	CONSTRAINT_TYPE
553 554
select * from information_schema.KEY_COLUMN_USAGE where
TABLE_NAME= "vo";
555
CONSTRAINT_CATALOG	CONSTRAINT_SCHEMA	CONSTRAINT_NAME	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	COLUMN_NAME	ORDINAL_POSITION	POSITION_IN_UNIQUE_CONSTRAINT
556
drop view vo;
557 558 559 560
select TABLE_NAME,TABLE_TYPE,ENGINE
from information_schema.tables 
where table_schema='information_schema' limit 2;
TABLE_NAME	TABLE_TYPE	ENGINE
561 562
SCHEMATA	TEMPORARY	MEMORY
TABLES	TEMPORARY	MEMORY
563 564 565 566 567
show tables from information_schema like "T%";
Tables_in_information_schema (T%)
TABLES
TABLE_PRIVILEGES
TABLE_CONSTRAINTS
568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586
create database information_schema;
ERROR HY000: Can't create database 'information_schema'; database exists
use information_schema;
show full tables like "T%";
Tables_in_information_schema (T%)	Table_type
TABLES	TEMPORARY
TABLE_PRIVILEGES	TEMPORARY
TABLE_CONSTRAINTS	TEMPORARY
create table t1(a int);
ERROR 42S02: Unknown table 't1' in information_schema
use test;
show tables;
Tables_in_test
use information_schema;
show tables like "T%";
Tables_in_information_schema (T%)
TABLES
TABLE_PRIVILEGES
TABLE_CONSTRAINTS
587 588 589 590 591 592 593 594 595 596 597 598 599 600 601
select table_name from tables where table_name='user';
table_name
user
select column_name, privileges from columns
where table_name='user' and column_name like '%o%';
column_name	privileges
Host	select,insert,update,references
Password	select,insert,update,references
Drop_priv	select,insert,update,references
Reload_priv	select,insert,update,references
Shutdown_priv	select,insert,update,references
Process_priv	select,insert,update,references
Show_db_priv	select,insert,update,references
Lock_tables_priv	select,insert,update,references
Show_view_priv	select,insert,update,references
602 603
Create_routine_priv	select,insert,update,references
Alter_routine_priv	select,insert,update,references
604 605
max_questions	select,insert,update,references
max_connections	select,insert,update,references
606
max_user_connections	select,insert,update,references
607 608 609 610 611 612 613 614 615
use test;
create function sub1(i int) returns int
return i+1;
create table t1(f1 int);
create view t2 (c) as select f1 from t1;
create view t3 (c) as select sub1(1);
create table t4(f1 int, KEY f1_key (f1));
drop table t1;
drop function sub1;
616 617 618 619 620 621 622 623 624 625 626 627
select table_name from information_schema.views
where table_schema='test';
table_name
Warnings:
Warning	1356	View 'test.t2' references invalid table(s) or column(s) or function(s)
Warning	1356	View 'test.t3' references invalid table(s) or column(s) or function(s)
select table_name from information_schema.views
where table_schema='test';
table_name
Warnings:
Warning	1356	View 'test.t2' references invalid table(s) or column(s) or function(s)
Warning	1356	View 'test.t3' references invalid table(s) or column(s) or function(s)
628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643
select column_name from information_schema.columns
where table_schema='test';
column_name
f1
Warnings:
Warning	1356	View 'test.t2' references invalid table(s) or column(s) or function(s)
Warning	1356	View 'test.t3' references invalid table(s) or column(s) or function(s)
select index_name from information_schema.statistics where table_schema='test';
index_name
f1_key
select constraint_name from information_schema.table_constraints
where table_schema='test';
constraint_name
drop view t2;
drop view t3;
drop table t4;
644 645
select * from information_schema.table_names;
ERROR 42S02: Unknown table 'table_names' in information_schema
646 647 648 649 650 651
select column_type from information_schema.columns
where table_schema="information_schema" and table_name="COLUMNS" and
(column_name="character_set_name" or column_name="collation_name");
column_type
varchar(64)
varchar(64)
652 653 654 655 656 657 658 659
select TABLE_ROWS from information_schema.tables where 
table_schema="information_schema" and table_name="COLUMNS";
TABLE_ROWS
NULL
select table_type from information_schema.tables
where table_schema="mysql" and table_name="user";
table_type
BASE TABLE
660 661 662
show open tables where `table` like "user";
Database	Table	In_use	Name_locked
mysql	user	0	0
663 664 665 666 667
show status where variable_name like "%database%";
Variable_name	Value
Com_show_databases	0
show variables where variable_name like "skip_show_databas";
Variable_name	Value
668 669 670
show global status like "Threads_running";
Variable_name	Value
Threads_running	1
671 672 673 674 675 676
create table t1(f1 int);
create table t2(f2 int);
create view v1 as select * from t1, t2;
set @got_val= (select count(*) from information_schema.columns);
drop view v1;
drop table t1, t2;
677 678 679
CREATE TABLE t_crashme ( f1 BIGINT);
CREATE VIEW a1 (t_CRASHME) AS SELECT f1 FROM t_crashme GROUP BY f1;
CREATE VIEW a2 AS SELECT t_CRASHME FROM a1;
680 681
count(*)
100
682 683
drop view a2, a1;
drop table t_crashme;
684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699
select table_schema,table_name, column_name from
information_schema.columns 
where data_type = 'longtext';
table_schema	table_name	column_name
information_schema	COLUMNS	COLUMN_TYPE
information_schema	ROUTINES	ROUTINE_DEFINITION
information_schema	ROUTINES	SQL_MODE
information_schema	VIEWS	VIEW_DEFINITION
select table_name, column_name, data_type from information_schema.columns
where data_type = 'datetime';
table_name	column_name	data_type
TABLES	CREATE_TIME	datetime
TABLES	UPDATE_TIME	datetime
TABLES	CHECK_TIME	datetime
ROUTINES	CREATED	datetime
ROUTINES	LAST_ALTERED	datetime
700 701 702 703 704 705 706
SELECT COUNT(*) FROM INFORMATION_SCHEMA.TABLES A
WHERE NOT EXISTS 
(SELECT * FROM INFORMATION_SCHEMA.COLUMNS B
WHERE A.TABLE_SCHEMA = B.TABLE_SCHEMA
AND A.TABLE_NAME = B.TABLE_NAME);
COUNT(*)
0
707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728
create table t1
( x_bigint BIGINT,
x_integer INTEGER,
x_smallint SMALLINT,
x_decimal DECIMAL(5,3),
x_numeric NUMERIC(5,3),
x_real REAL,
x_float FLOAT,
x_double_precision DOUBLE PRECISION );
SELECT COLUMN_NAME, CHARACTER_MAXIMUM_LENGTH, CHARACTER_OCTET_LENGTH
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME= 't1';
COLUMN_NAME	CHARACTER_MAXIMUM_LENGTH	CHARACTER_OCTET_LENGTH
x_bigint	NULL	NULL
x_integer	NULL	NULL
x_smallint	NULL	NULL
x_decimal	NULL	NULL
x_numeric	NULL	NULL
x_real	NULL	NULL
x_float	NULL	NULL
x_double_precision	NULL	NULL
drop table t1;