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DROP TABLE IF EXISTS t0,t1,t2,t3,t4,t5;
select count(*) from data_dictionary.SCHEMAS where schema_name > 'm';
count(*)
#
select count(*) from data_dictionary.schemas;
count(*)
#
show databases like 't%';
Database (t%)
test
show databases;
Database
DATA_DICTIONARY
INFORMATION_SCHEMA
mysql
test
create database mysqltest;
create table mysqltest.t1(a int, b VARCHAR(30), KEY string_data (b));
create table test.t2(a int);
create table t3(a int, KEY a_data (a));
create table mysqltest.t4(a int);
create table t5 (id int auto_increment primary key);
insert into t5 values (10);
select table_name from data_dictionary.TABLES
where table_schema = "mysqltest" and table_name like "t%";
table_name
t1
t4
show tables like 't%';
Tables_in_test (t%)
t2
t3
t5
show table status;
Session Schema Name Type Engine Version Rows Avg_row_length Table_size Auto_increment
# test t5 STANDARD InnoDB # # # # #
show columns from t3 like "a%";
Field Type Null Default Default_is_NULL On_Update
a INTEGER YES YES
select * from data_dictionary.COLUMNS where table_name="t1"
and column_name= "a";
TABLE_SCHEMA TABLE_NAME COLUMN_NAME COLUMN_TYPE ORDINAL_POSITION COLUMN_DEFAULT COLUMN_DEFAULT_IS_NULL COLUMN_DEFAULT_UPDATE IS_AUTO_INCREMENT IS_NULLABLE IS_INDEXED IS_USED_IN_PRIMARY IS_UNIQUE IS_MULTI IS_FIRST_IN_MULTI INDEXES_FOUND_IN DATA_TYPE CHARACTER_MAXIMUM_LENGTH CHARACTER_OCTET_LENGTH NUMERIC_PRECISION NUMERIC_SCALE ENUM_VALUES COLLATION_NAME COLUMN_COMMENT
mysqltest t1 a INTEGER 0 NULL YES NO YES NO NO NO NO NO 0 INTEGER 0 0 0 0 NULL NULL
select table_name, column_name from data_dictionary.columns
where table_schema = 'mysqltest' and table_name = 't1';
table_name column_name
t1 a
t1 b
show columns from mysqltest.t1;
Field Type Null Default Default_is_NULL On_Update
a INTEGER YES YES
b VARCHAR YES YES
drop tables mysqltest.t4, mysqltest.t1, t2, t3, t5;
drop database mysqltest;
select * from data_dictionary.CHARACTER_SETS
where CHARACTER_SET_NAME like 'latin1%';
CHARACTER_SET_NAME DEFAULT_COLLATE_NAME DESCRIPTION MAXLEN
select * from data_dictionary.COLLATIONS
where COLLATION_NAME like 'latin1%';
CHARACTER_SET_NAME COLLATION_NAME DESCRIPTION ID IS_DEFAULT IS_COMPILED SORTLEN
select DATA_TYPE from data_dictionary.columns
where table_schema="data_dictionary" and table_name="COLUMNS" and
(column_name="character_set_name" or column_name="collation_name");
DATA_TYPE
VARCHAR
select TABLE_TYPE from data_dictionary.tables where
table_schema="data_dictionary" and table_name="COLUMNS";
TABLE_TYPE
FUNCTION
select table_type from data_dictionary.tables
where table_schema="mysql" and table_name="user";
table_type
select table_schema,table_name, column_name from
data_dictionary.columns
where DATA_TYPE = 'longtext';
table_schema table_name column_name
select table_name, column_name, DATA_TYPE from data_dictionary.columns
where DATA_TYPE = 'datetime';
table_name column_name DATA_TYPE
SELECT COUNT(*) FROM DATA_DICTIONARY.TABLES A
WHERE NOT EXISTS
(SELECT * FROM DATA_DICTIONARY.COLUMNS B
WHERE A.TABLE_SCHEMA = B.TABLE_SCHEMA
AND A.TABLE_NAME = B.TABLE_NAME);
COUNT(*)
0
create table t1
( x_bigint BIGINT,
x_integer INTEGER,
x_int int,
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 DATA_DICTIONARY.COLUMNS
WHERE TABLE_NAME= 't1';
COLUMN_NAME CHARACTER_MAXIMUM_LENGTH CHARACTER_OCTET_LENGTH
x_bigint 0 0
x_decimal 0 0
x_double_precision 0 0
x_float 0 0
x_int 0 0
x_integer 0 0
x_numeric 0 0
x_real 0 0
drop table t1;
SELECT table_schema, count(*) FROM data_dictionary.TABLES
WHERE table_name NOT LIKE 'ndb_%' AND
table_name NOT LIKE 'falcon%' AND
ENGINE IS NULL
GROUP BY TABLE_SCHEMA;
table_schema count(*)
create table t1(f1 LONGBLOB, f2 LONGTEXT);
select column_name, DATA_TYPE, CHARACTER_OCTET_LENGTH,
CHARACTER_MAXIMUM_LENGTH
from data_dictionary.columns
where table_name='t1';
column_name DATA_TYPE CHARACTER_OCTET_LENGTH CHARACTER_MAXIMUM_LENGTH
f1 BLOB 0 0
f2 BLOB 0 0
drop table t1;
create table t1(f1 int, f2 int, f3 BIGINT, f4 int,
f5 BIGINT, f6 int, f7 int);
select column_name, NUMERIC_PRECISION, NUMERIC_SCALE
from data_dictionary.columns
where table_name='t1';
column_name NUMERIC_PRECISION NUMERIC_SCALE
f1 0 0
f2 0 0
f3 0 0
f4 0 0
f5 0 0
f6 0 0
f7 0 0
drop table t1;
create table t1 (a int not null, b int);
use data_dictionary;
select column_name, column_default,column_default_is_null from columns
where table_schema='test' and table_name='t1';
column_name column_default column_default_is_null
a NULL NO
b NULL YES
use test;
show columns from t1;
Field Type Null Default Default_is_NULL On_Update
a INTEGER NO NO
b INTEGER YES YES
drop table t1;
alter database data_dictionary;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your Drizzle server version for the right syntax to use near '' at line 1
use data_dictionary;
use data_dictionary;
create temporary table schemas(f1 char(10));
ERROR 42000: Access denied for user ''@'' to database 'data_dictionary'
use test;
create table t1(id int);
insert into t1(id) values (1);
select 1 from (select 1 from test.t1) a;
1
1
use data_dictionary;
select 1 from (select 1 from test.t1) a;
1
1
use test;
drop table t1;
create temporary table t1(f1 int, index(f1));
show columns from t1;
Field Type Null Default Default_is_NULL On_Update
f1 INTEGER YES YES
describe t1;
Field Type Null Default Default_is_NULL On_Update
f1 INTEGER YES YES
show indexes from t1;
Table Unique Key_name Seq_in_index Column_name
t1 NO f1 1 f1
drop table t1;
create table t1(f1 varbinary(32), f2 varbinary(64));
select character_maximum_length, character_octet_length
from data_dictionary.columns where table_name='t1';
character_maximum_length character_octet_length
32 128
64 256
drop table t1;
select DATA_TYPE, group_concat(table_schema, '.', table_name) as a, count(*) as num
from data_dictionary.columns where
table_schema='data_dictionary' and
(DATA_TYPE = 'varchar' or DATA_TYPE = 'varchar'
or DATA_TYPE = 'varchar')
group by DATA_TYPE order by DATA_TYPE, num;
DATA_TYPE a num
VARCHAR # #
Warnings:
Warning # #
create table t1(f1 char(1) not null, f2 char(9) not null);
select CHARACTER_MAXIMUM_LENGTH, CHARACTER_OCTET_LENGTH from
data_dictionary.columns where table_schema='test' and table_name = 't1';
CHARACTER_MAXIMUM_LENGTH CHARACTER_OCTET_LENGTH
1 4
9 36
drop table t1;
set @a:= '.';
create table t1(f1 char(5));
create table t2(f1 char(5));
select concat(@a, table_name), @a, table_name
from data_dictionary.tables where table_schema = 'test';
concat(@a, table_name) @a table_name
.t1 . t1
.t2 . t2
drop table t1,t2;
SELECT t.table_name, c1.column_name
FROM data_dictionary.tables t
INNER JOIN
data_dictionary.columns c1
ON t.table_schema = c1.table_schema AND
t.table_name = c1.table_name
WHERE t.table_schema = 'data_dictionary' AND
c1.ordinal_position =
( SELECT COALESCE(MIN(c2.ordinal_position),1)
FROM data_dictionary.columns c2
WHERE c2.table_schema = t.table_schema AND
c2.table_name = t.table_name AND
c2.column_name LIKE '%SCHEMA%'
)
AND t.table_name NOT LIKE 'falcon%'
AND t.ENGINE IS NULL;
table_name column_name
SELECT t.table_name, c1.column_name
FROM data_dictionary.tables t
INNER JOIN
data_dictionary.columns c1
ON t.table_schema = c1.table_schema AND
t.table_name = c1.table_name
WHERE t.table_schema = 'data_dictionary' AND
c1.ordinal_position =
( SELECT COALESCE(MIN(c2.ordinal_position),1)
FROM data_dictionary.columns c2
WHERE c2.table_schema = 'data_dictionary' AND
c2.table_name = t.table_name AND
c2.column_name LIKE '%SCHEMA%'
)
AND t.table_name NOT LIKE 'falcon%'
AND t.ENGINE IS NULL;
table_name column_name
SELECT MAX(table_name) FROM data_dictionary.tables;
MAX(table_name)
VIEW_TABLE_USAGE
SELECT table_name from data_dictionary.tables
WHERE table_name=(SELECT MAX(table_name)
FROM data_dictionary.tables);
table_name
VIEW_TABLE_USAGE
create table t1 (f1 int);
create table t2 (f1 int, f2 int);
select table_name from data_dictionary.tables
where table_schema = 'test' and table_name not in
(select table_name from data_dictionary.columns
where table_schema = 'test' and column_name = 'f3');
table_name
t1
t2
drop table t1,t2;
select 1 as f1 from data_dictionary.tables where "CHARACTER_SETS"=
(select cast(table_name as char) from data_dictionary.tables
order by table_name limit 1) limit 1;
f1
1
select t.table_name, group_concat(t.table_schema, '.', t.table_name),
count(*) as num1
from data_dictionary.tables t
inner join data_dictionary.columns c1
on t.table_schema = c1.table_schema AND t.table_name = c1.table_name
where t.table_schema = 'data_dictionary' AND
t.table_name not like 'falcon%' AND
t.ENGINE IS NULL AND
c1.ordinal_position =
(select isnull(c2.DATA_TYPE) -
isnull(group_concat(c2.table_schema, '.', c2.table_name)) +
count(*) as num
from data_dictionary.columns c2 where
c2.table_schema='data_dictionary' and
(c2.DATA_TYPE = 'varchar' or c2.DATA_TYPE = 'varchar')
group by c2.DATA_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
alter database;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your Drizzle server version for the right syntax to use near '' at line 1
alter database test;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your Drizzle server version for the right syntax to use near '' at line 1
create table t1 (
f1 varchar(50),
f2 varchar(50) not null,
f3 varchar(50) default '',
f4 varchar(50) default NULL,
f5 bigint not null,
f6 bigint not null default 10,
f7 datetime not null,
f8 datetime default '2006-01-01'
);
select column_name,column_default,column_default_is_null from data_dictionary.columns where table_name= 't1';
column_name column_default column_default_is_null
f1 NULL YES
f2 NULL NO
f3 NO
f4 NULL YES
f5 NULL NO
f6 10 NO
f7 NULL NO
f8 2006-01-01 00:00:00 NO
show columns from t1;
Field Type Null Default Default_is_NULL On_Update
f1 VARCHAR YES YES
f2 VARCHAR NO NO
f3 VARCHAR YES NO
f4 VARCHAR YES YES
f5 BIGINT NO NO
f6 BIGINT NO 10 NO
f7 DATETIME NO NO
f8 DATETIME YES 2006-01-01 00:00:00 NO
drop table t1;
SET max_heap_table_size = DEFAULT;
USE test;
End of 5.0 tests.
SELECT SCHEMA_NAME FROM DATA_DICTIONARY.SCHEMAS
WHERE SCHEMA_NAME ='data_dictionary';
SCHEMA_NAME
data_dictionary
SELECT TABLE_COLLATION FROM DATA_DICTIONARY.TABLES
WHERE TABLE_SCHEMA='mysql' and TABLE_NAME= 'db';
TABLE_COLLATION
select * from data_dictionary.columns where table_schema = NULL;
TABLE_SCHEMA TABLE_NAME COLUMN_NAME COLUMN_TYPE ORDINAL_POSITION COLUMN_DEFAULT COLUMN_DEFAULT_IS_NULL COLUMN_DEFAULT_UPDATE IS_AUTO_INCREMENT IS_NULLABLE IS_INDEXED IS_USED_IN_PRIMARY IS_UNIQUE IS_MULTI IS_FIRST_IN_MULTI INDEXES_FOUND_IN DATA_TYPE CHARACTER_MAXIMUM_LENGTH CHARACTER_OCTET_LENGTH NUMERIC_PRECISION NUMERIC_SCALE ENUM_VALUES COLLATION_NAME COLUMN_COMMENT
select * from `data_dictionary`.`COLUMNS` where `TABLE_NAME` = NULL;
TABLE_SCHEMA TABLE_NAME COLUMN_NAME COLUMN_TYPE ORDINAL_POSITION COLUMN_DEFAULT COLUMN_DEFAULT_IS_NULL COLUMN_DEFAULT_UPDATE IS_AUTO_INCREMENT IS_NULLABLE IS_INDEXED IS_USED_IN_PRIMARY IS_UNIQUE IS_MULTI IS_FIRST_IN_MULTI INDEXES_FOUND_IN DATA_TYPE CHARACTER_MAXIMUM_LENGTH CHARACTER_OCTET_LENGTH NUMERIC_PRECISION NUMERIC_SCALE ENUM_VALUES COLLATION_NAME COLUMN_COMMENT
select * from `data_dictionary`.`INDEXES` where `TABLE_SCHEMA` = NULL;
TABLE_SCHEMA TABLE_NAME INDEX_NAME IS_USED_IN_PRIMARY IS_UNIQUE IS_NULLABLE KEY_LENGTH INDEX_TYPE INDEX_COMMENT
select * from `data_dictionary`.`INDEXES` where `TABLE_NAME` = NULL;
TABLE_SCHEMA TABLE_NAME INDEX_NAME IS_USED_IN_PRIMARY IS_UNIQUE IS_NULLABLE KEY_LENGTH INDEX_TYPE INDEX_COMMENT
select * from data_dictionary.schemas where schema_name = NULL;
SCHEMA_NAME DEFAULT_COLLATION_NAME SCHEMA_CREATION_TIME SCHEMA_UPDATE_TIME
select * from data_dictionary.tables where table_schema = NULL;
TABLE_SCHEMA TABLE_NAME TABLE_TYPE ENGINE ROW_FORMAT TABLE_COLLATION TABLE_CREATION_TIME TABLE_UPDATE_TIME TABLE_COMMENT AUTO_INCREMENT
select * from data_dictionary.tables where table_name = NULL;
TABLE_SCHEMA TABLE_NAME TABLE_TYPE ENGINE ROW_FORMAT TABLE_COLLATION TABLE_CREATION_TIME TABLE_UPDATE_TIME TABLE_COMMENT AUTO_INCREMENT
#
# Test that the query is visible to self and others.
#
SELECT info FROM data_dictionary.processlist WHERE id = CONNECTION_ID();
info
SELECT info FROM data_dictionary.processlist WHERE id = CONNECTION_ID()
SELECT * FROM data_dictionary.character_sets ORDER BY character_set_name;
CHARACTER_SET_NAME DEFAULT_COLLATE_NAME DESCRIPTION MAXLEN
# # # 1
# # # 4
SELECT * FROM data_dictionary.collations ORDER BY collation_name;
CHARACTER_SET_NAME COLLATION_NAME DESCRIPTION ID IS_DEFAULT IS_COMPILED SORTLEN
binary binary binary 63 YES YES 1
utf8_general_ci utf8_bin utf8 46 NO YES 1
utf8_general_ci utf8_czech_ci utf8 234 NO YES 8
utf8_general_ci utf8_danish_ci utf8 235 NO YES 8
utf8_general_ci utf8_esperanto_ci utf8 241 NO YES 8
utf8_general_ci utf8_estonian_ci utf8 230 NO YES 8
utf8_general_ci utf8_general_ci utf8 45 YES YES 1
utf8_general_ci utf8_hungarian_ci utf8 242 NO YES 8
utf8_general_ci utf8_icelandic_ci utf8 225 NO YES 8
utf8_general_ci utf8_latvian_ci utf8 226 NO YES 8
utf8_general_ci utf8_lithuanian_ci utf8 236 NO YES 8
utf8_general_ci utf8_persian_ci utf8 240 NO YES 8
utf8_general_ci utf8_polish_ci utf8 229 NO YES 8
utf8_general_ci utf8_romanian_ci utf8 227 NO YES 8
utf8_general_ci utf8_roman_ci utf8 239 NO YES 8
utf8_general_ci utf8_sinhala_ci utf8 243 NO YES 8
utf8_general_ci utf8_slovak_ci utf8 237 NO YES 8
utf8_general_ci utf8_slovenian_ci utf8 228 NO YES 8
utf8_general_ci utf8_spanish2_ci utf8 238 NO YES 8
utf8_general_ci utf8_spanish_ci utf8 231 NO YES 8
utf8_general_ci utf8_swedish_ci utf8 232 NO YES 8
utf8_general_ci utf8_turkish_ci utf8 233 NO YES 8
utf8_general_ci utf8_unicode_ci utf8 224 NO YES 8
SELECT table_name, column_name
FROM data_dictionary.columns
WHERE table_name IN
(SELECT table_name FROM data_dictionary.tables
WHERE ENGINE IS NULL)
ORDER BY table_name;
table_name column_name
SELECT count(schema_name) FROM data_dictionary.schemas ORDER BY schema_name;
count(schema_name)
#
SELECT count(*) FROM data_dictionary.session_status ORDER BY variable_name;
count(*)
#
SELECT count(*) FROM data_dictionary.session_variables ORDER BY variable_name;
count(*)
#
SELECT count(*) FROM data_dictionary.global_status ORDER BY variable_name;
count(*)
#
SELECT count(*) FROM data_dictionary.global_variables ORDER BY variable_name;
count(*)
#
SELECT table_schema, table_name FROM data_dictionary.tables WHERE ENGINE IS NULL ORDER BY table_name;
table_schema table_name
SELECT count(*) FROM data_dictionary.plugins;
count(*)
#
|