key.result

这是linux下运行的mysql软件包,可用于linux 下安装 php + mysql + apach 的网络配置

drop table if exists t1,t2,t3;
SET SQL_WARNINGS=1;
CREATE TABLE t1 (
ID CHAR(32) NOT NULL,
name CHAR(32) NOT NULL,
value CHAR(255),
INDEX indexIDname (ID(8),name(8))
) ;
INSERT INTO t1 VALUES
('keyword','indexdir','/export/home/local/www/database/indexes/keyword');
INSERT INTO t1 VALUES ('keyword','urlprefix','text/ /text');
INSERT INTO t1 VALUES ('keyword','urlmap','/text/ /');
INSERT INTO t1 VALUES ('keyword','attr','personal employee company');
INSERT INTO t1 VALUES
('emailgids','indexdir','/export/home/local/www/database/indexes/emailgids');
INSERT INTO t1 VALUES ('emailgids','urlprefix','text/ /text');
INSERT INTO t1 VALUES ('emailgids','urlmap','/text/ /');
INSERT INTO t1 VALUES ('emailgids','attr','personal employee company');
SELECT value FROM t1 WHERE ID='emailgids' AND name='attr';
value
personal employee company
drop table t1;
CREATE TABLE t1 (
price int(5) DEFAULT '0' NOT NULL,
area varchar(40) DEFAULT '' NOT NULL,
type varchar(40) DEFAULT '' NOT NULL,
transityes enum('Y','N') DEFAULT 'Y' NOT NULL,
shopsyes enum('Y','N') DEFAULT 'Y' NOT NULL,
schoolsyes enum('Y','N') DEFAULT 'Y' NOT NULL,
petsyes enum('Y','N') DEFAULT 'Y' NOT NULL,
KEY price (price,area,type,transityes,shopsyes,schoolsyes,petsyes)
);
INSERT INTO t1 VALUES (900,'Vancouver','Shared/Roomate','N','N','N','N');
INSERT INTO t1 VALUES (900,'Vancouver','Shared/Roomate','N','N','N','N');
INSERT INTO t1 VALUES (900,'Vancouver','Shared/Roomate','','','','');
Warnings:
Warning	1265	Data truncated for column 'transityes' at row 1
Warning	1265	Data truncated for column 'shopsyes' at row 1
Warning	1265	Data truncated for column 'schoolsyes' at row 1
Warning	1265	Data truncated for column 'petsyes' at row 1
INSERT INTO t1 VALUES (900,'Vancouver','Shared/Roomate','Y','Y','Y','Y');
INSERT INTO t1 VALUES (900,'Vancouver','Shared/Roomate','Y','Y','Y','Y');
INSERT INTO t1 VALUES (900,'Vancouver','Shared/Roomate','Y','Y','Y','Y');
INSERT INTO t1 VALUES (900,'Vancouver','Shared/Roomate','Y','Y','Y','Y');
INSERT INTO t1 VALUES (900,'Vancouver','Shared/Roomate','Y','Y','Y','Y');
SELECT * FROM t1 WHERE area='Vancouver' and transityes='y' and schoolsyes='y' and ( ((type='1 Bedroom' or type='Studio/Bach') and (price<=500)) or ((type='2 Bedroom') and (price<=550)) or ((type='Shared/Roomate') and (price<=300)) or ((type='Room and Board') and (price<=500)) ) and price <= 400;
price	area	type	transityes	shopsyes	schoolsyes	petsyes
drop table t1;
CREATE TABLE t1 (program enum('signup','unique','sliding') not null,  type enum('basic','sliding','signup'),  sites set('mt'),  PRIMARY KEY (program));
ALTER TABLE t1 modify program enum('signup','unique','sliding');
drop table t1;
CREATE TABLE t1 (
name varchar(50) DEFAULT '' NOT NULL,
author varchar(50) DEFAULT '' NOT NULL,
category decimal(10,0) DEFAULT '0' NOT NULL,
email varchar(50),
password varchar(50),
proxy varchar(50),
bitmap varchar(20),
msg varchar(255),
urlscol varchar(127),
urlhttp varchar(127),
timeout decimal(10,0),
nbcnx decimal(10,0),
creation decimal(10,0),
livinguntil decimal(10,0),
lang decimal(10,0),
type decimal(10,0),
subcat decimal(10,0),
subtype decimal(10,0),
reg char(1),
scs varchar(255),
capacity decimal(10,0),
userISP varchar(50),
CCident varchar(50) DEFAULT '' NOT NULL,
PRIMARY KEY (name,author,category)
);
INSERT INTO t1 VALUES
('patnom','patauteur',0,'[e-mail]',NULL,NULL,'#p2sndnq6ae5g1u6t','essai salut','scol://195.242.78.119:patauteur.patnom',NULL,NULL,NULL,950036174,-882087474,NULL,3,0,3,'1','Pub/patnom/futur_divers.scs',NULL,'pat','CC1');
INSERT INTO t1 VALUES
('LeNomDeMonSite','Marc',0,'[e-mail]',NULL,NULL,NULL,NULL,'scol://195.242.78.119:Marc.LeNomDeMonSite',NULL,NULL,NULL,950560434,-881563214,NULL,3,0,3,'1','Pub/LeNomDeMonSite/domus_hibere.scs',NULL,'Marq','CC1');
select * from t1 where name='patnom' and author='patauteur' and category=0;
name	author	category	email	password	proxy	bitmap	msg	urlscol	urlhttp	timeout	nbcnx	creation	livinguntil	lang	type	subcat	subtype	reg	scs	capacity	userISP	CCident
patnom	patauteur	0	[e-mail]	NULL	NULL	#p2sndnq6ae5g1u6t	essai salut	scol://195.242.78.119:patauteur.patnom	NULL	NULL	NULL	950036174	-882087474	NULL	3	0	3	1	Pub/patnom/futur_divers.scs	NULL	pat	CC1
drop table t1;
create table t1
(
name_id int not null auto_increment,
name blob,
INDEX name_idx (name(5)),
primary key (name_id)
);
INSERT t1 VALUES(NULL,'/');
INSERT t1 VALUES(NULL,'[T,U]_axpby');
SELECT * FROM t1 WHERE name='[T,U]_axpy';
name_id	name
SELECT * FROM t1 WHERE name='[T,U]_axpby';
name_id	name
2	[T,U]_axpby
create table t2
(
name_id int not null auto_increment,
name char(255) binary,
INDEX name_idx (name(5)),
primary key (name_id)
);
INSERT t2 select * from t1;
SELECT * FROM t2 WHERE name='[T,U]_axpy';
name_id	name
SELECT * FROM t2 WHERE name='[T,U]_axpby';
name_id	name
2	[T,U]_axpby
CREATE TABLE t3 SELECT * FROM t2 WHERE name='[T,U]_axpby';
SELECT * FROM t2 WHERE name='[T,U]_axpby';
name_id	name
2	[T,U]_axpby
drop table t1,t2,t3;
create table t1
(
SEQNO                         numeric(12 ) not null,
MOTYPEID                 numeric(12 ) not null,
MOINSTANCEID     numeric(12 ) not null,
ATTRID                       numeric(12 ) not null,
VALUE                         varchar(120) not null,
primary key (SEQNO, MOTYPEID, MOINSTANCEID, ATTRID, VALUE )
);
INSERT INTO t1 VALUES (1, 1, 1, 1, 'a');
INSERT INTO t1 VALUES (1, 1, 1, 1, 'b');
INSERT INTO t1 VALUES (1, 1, 1, 1, 'a');
ERROR 23000: Duplicate entry '1-1-1-1-a' for key 1
drop table t1;
CREATE TABLE t1 (
a tinytext NOT NULL,
b tinyint(3) unsigned NOT NULL default '0',
PRIMARY KEY (a(32),b)
) ENGINE=MyISAM;
INSERT INTO t1 VALUES ('a',1),('a',2);
SELECT * FROM t1 WHERE a='a' AND b=2;
a	b
a	2
SELECT * FROM t1 WHERE a='a' AND b in (2);
a	b
a	2
SELECT * FROM t1 WHERE a='a' AND b in (1,2);
a	b
a	1
a	2
drop table t1;
create table t1 (a int not null unique, b int unique, c int, d int not null primary key, key(c), e int not null unique);
show keys from t1;
Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment
t1	0	PRIMARY	1	d	A	0	NULL	NULL		BTREE	
t1	0	a	1	a	A	0	NULL	NULL		BTREE	
t1	0	e	1	e	A	0	NULL	NULL		BTREE	
t1	0	b	1	b	A	NULL	NULL	NULL	YES	BTREE	
t1	1	c	1	c	A	NULL	NULL	NULL	YES	BTREE	
drop table t1;
CREATE TABLE t1 (c CHAR(10) NOT NULL,i INT NOT NULL AUTO_INCREMENT,
UNIQUE (c,i));
INSERT INTO t1 (c) VALUES (NULL),(NULL);
Warnings:
Warning	1263	Column set to default value; NULL supplied to NOT NULL column 'c' at row 1
Warning	1263	Column set to default value; NULL supplied to NOT NULL column 'c' at row 2
SELECT * FROM t1;
c	i
	1
	2
INSERT INTO t1 (c) VALUES ('a'),('a');
SELECT * FROM t1;
c	i
	1
	2
a	1
a	2
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (c CHAR(10) NULL, i INT NOT NULL AUTO_INCREMENT,
UNIQUE (c,i));
INSERT INTO t1 (c) VALUES (NULL),(NULL);
SELECT * FROM t1;
c	i
NULL	1
NULL	2
INSERT INTO t1 (c) VALUES ('a'),('a');
SELECT * FROM t1;
c	i
NULL	1
NULL	2
a	1
a	2
drop table t1;
create table t1 (i int, a char(200), b text, unique (a), unique (b(300))) charset utf8;
insert t1 values (1, repeat('a',210), repeat('b', 310));
Warnings:
Warning	1265	Data truncated for column 'a' at row 1
insert t1 values (2, repeat(0xD0B1,215), repeat(0xD0B1, 310));
Warnings:
Warning	1265	Data truncated for column 'a' at row 1
select i, length(a), length(b), char_length(a), char_length(b) from t1;
i	length(a)	length(b)	char_length(a)	char_length(b)
1	200	310	200	310
2	400	620	200	310
select i from t1 where a=repeat(_utf8 'a',200);
i
1
select i from t1 where a=repeat(_utf8 0xD0B1,200);
i
2
select i from t1 where b=repeat(_utf8 'b',310);
i
1
drop table t1;
CREATE TABLE t1 (id int unsigned auto_increment, name char(50), primary key (id)) engine=myisam;
insert into t1 (name) values ('a'), ('b'),('c'),('d'),('e'),('f'),('g');
explain select 1 from t1 where id =2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	Using index
explain select 1 from t1 where id =2 or id=3;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	index	PRIMARY	PRIMARY	4	NULL	7	Using where; Using index
explain select name from t1 where id =2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	
ALTER TABLE t1 DROP PRIMARY KEY, ADD INDEX (id);
explain select 1 from t1 where id =2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ref	id	id	4	const	1	Using index
drop table t1;
CREATE TABLE t1 (numeropost mediumint(8) unsigned NOT NULL default '0', numreponse int(10) unsigned NOT NULL auto_increment, PRIMARY KEY (numeropost,numreponse), UNIQUE KEY numreponse (numreponse));
INSERT INTO t1 (numeropost,numreponse) VALUES ('1','1'),('1','2'),('2','3'),('2','4');
SELECT numeropost FROM t1 WHERE numreponse='1';
numeropost
1
EXPLAIN SELECT numeropost FROM t1 WHERE numreponse='1';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	const	numreponse	numreponse	4	const	1	Using index
FLUSH TABLES;
SELECT numeropost FROM t1 WHERE numreponse='1';
numeropost
1
drop table t1;
create table t1 (c varchar(30) character set utf8, t text character set utf8, unique (c(2)), unique (t(3))) engine=myisam;
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `c` varchar(30) character set utf8 default NULL,
  `t` text character set utf8,
  UNIQUE KEY `c` (`c`(2)),
  UNIQUE KEY `t` (`t`(3))
) ENGINE=MyISAM DEFAULT CHARSET=latin1
insert t1 values ('cccc', 'tttt'),
(0xD0B1212223D0B1D0B1D0B1D0B1D0B1, 0xD0B1D0B1212223D0B1D0B1D0B1D0B1),
(0xD0B1222123D0B1D0B1D0B1D0B1D0B1, 0xD0B1D0B1222123D0B1D0B1D0B1D0B1);
insert t1 (c) values ('cc22');
ERROR 23000: Duplicate entry 'cc22' for key 1
insert t1 (t) values ('ttt22');
ERROR 23000: Duplicate entry 'ttt22' for key 2
insert t1 (c) values (0xD0B1212322D0B1D0B1D0B1D0B1D0B1);
ERROR 23000: Duplicate entry '斜!#"