analyse.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;
create table t1 (i int, j int, empty_string char(10), bool char(1), d date);
insert into t1 values (1,2,"","Y","2002-03-03"), (3,4,"","N","2002-03-04"), (5,6,"","Y","2002-03-04"), (7,8,"","N","2002-03-05");
select count(*) from t1 procedure analyse();
Field_name	Min_value	Max_value	Min_length	Max_length	Empties_or_zeros	Nulls	Avg_value_or_avg_length	Std	Optimal_fieldtype
count(*)	4	4	1	1	0	0	4.0000	0.0000	ENUM('4') NOT NULL
select * from t1 procedure analyse();
Field_name	Min_value	Max_value	Min_length	Max_length	Empties_or_zeros	Nulls	Avg_value_or_avg_length	Std	Optimal_fieldtype
test.t1.i	1	7	1	1	0	0	4.0000	2.2361	ENUM('1','3','5','7') NOT NULL
test.t1.j	2	8	1	1	0	0	5.0000	2.2361	ENUM('2','4','6','8') NOT NULL
test.t1.empty_string			0	0	4	0	0.0000	NULL	CHAR(0) NOT NULL
test.t1.bool	N	Y	1	1	0	0	1.0000	NULL	ENUM('N','Y') NOT NULL
test.t1.d	2002-03-03	2002-03-05	10	10	0	0	10.0000	NULL	ENUM('2002-03-03','2002-03-04','2002-03-05') NOT NULL
select * from t1 procedure analyse(2);
Field_name	Min_value	Max_value	Min_length	Max_length	Empties_or_zeros	Nulls	Avg_value_or_avg_length	Std	Optimal_fieldtype
test.t1.i	1	7	1	1	0	0	4.0000	2.2361	TINYINT(1) UNSIGNED NOT NULL
test.t1.j	2	8	1	1	0	0	5.0000	2.2361	TINYINT(1) UNSIGNED NOT NULL
test.t1.empty_string			0	0	4	0	0.0000	NULL	CHAR(0) NOT NULL
test.t1.bool	N	Y	1	1	0	0	1.0000	NULL	ENUM('N','Y') NOT NULL
test.t1.d	2002-03-03	2002-03-05	10	10	0	0	10.0000	NULL	ENUM('2002-03-03','2002-03-04','2002-03-05') NOT NULL
create table t2 select * from t1 procedure analyse();
select * from t2;
Field_name	Min_value	Max_value	Min_length	Max_length	Empties_or_zeros	Nulls	Avg_value_or_avg_length	Std	Optimal_fieldtype
test.t1.i	1	7	1	1	0	0	4.0000	2.2361	ENUM('1','3','5','7') NOT NULL
test.t1.j	2	8	1	1	0	0	5.0000	2.2361	ENUM('2','4','6','8') NOT NULL
test.t1.empty_string			0	0	4	0	0.0000	NULL	CHAR(0) NOT NULL
test.t1.bool	N	Y	1	1	0	0	1.0000	NULL	ENUM('N','Y') NOT NULL
test.t1.d	2002-03-03	2002-03-05	10	10	0	0	10.0000	NULL	ENUM('2002-03-03','2002-03-04','2002-03-05') NOT NULL
drop table t1,t2;
EXPLAIN SELECT 1 FROM (SELECT 1) a PROCEDURE ANALYSE();
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	1	
2	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
create table t1 (a int not null);
create table t2 select * from t1 where 0=1 procedure analyse();
show create table t2;
Table	Create Table
t2	CREATE TABLE `t2` (
  `Field_name` varbinary(255) NOT NULL default '',
  `Min_value` varbinary(255) default NULL,
  `Max_value` varbinary(255) default NULL,
  `Min_length` bigint(11) NOT NULL default '0',
  `Max_length` bigint(11) NOT NULL default '0',
  `Empties_or_zeros` bigint(11) NOT NULL default '0',
  `Nulls` bigint(11) NOT NULL default '0',
  `Avg_value_or_avg_length` varbinary(255) NOT NULL default '',
  `Std` varbinary(255) default NULL,
  `Optimal_fieldtype` varbinary(64) NOT NULL default ''
) ENGINE=MyISAM DEFAULT CHARSET=latin1
select * from t1 where 0=1 procedure analyse();
Field_name	Min_value	Max_value	Min_length	Max_length	Empties_or_zeros	Nulls	Avg_value_or_avg_length	Std	Optimal_fieldtype
insert into t1 values(1);
drop table t2;
create table t2 select * from t1 where 0=1 procedure analyse();
show create table t2;
Table	Create Table
t2	CREATE TABLE `t2` (
  `Field_name` varbinary(255) NOT NULL default '',
  `Min_value` varbinary(255) default NULL,
  `Max_value` varbinary(255) default NULL,
  `Min_length` bigint(11) NOT NULL default '0',
  `Max_length` bigint(11) NOT NULL default '0',
  `Empties_or_zeros` bigint(11) NOT NULL default '0',
  `Nulls` bigint(11) NOT NULL default '0',
  `Avg_value_or_avg_length` varbinary(255) NOT NULL default '',
  `Std` varbinary(255) default NULL,
  `Optimal_fieldtype` varbinary(64) NOT NULL default ''
) ENGINE=MyISAM DEFAULT CHARSET=latin1
select * from t2;
Field_name	Min_value	Max_value	Min_length	Max_length	Empties_or_zeros	Nulls	Avg_value_or_avg_length	Std	Optimal_fieldtype
insert into t2 select * from t1 procedure analyse();
select * from t2;
Field_name	Min_value	Max_value	Min_length	Max_length	Empties_or_zeros	Nulls	Avg_value_or_avg_length	Std	Optimal_fieldtype
test.t1.a	1	1	1	1	0	0	1.0000	0.0000	ENUM('1') NOT NULL
insert into t1 values(2);
drop table t2;
create table t2 select * from t1 where 0=1 procedure analyse();
show create table t2;
Table	Create Table
t2	CREATE TABLE `t2` (
  `Field_name` varbinary(255) NOT NULL default '',
  `Min_value` varbinary(255) default NULL,
  `Max_value` varbinary(255) default NULL,
  `Min_length` bigint(11) NOT NULL default '0',
  `Max_length` bigint(11) NOT NULL default '0',
  `Empties_or_zeros` bigint(11) NOT NULL default '0',
  `Nulls` bigint(11) NOT NULL default '0',
  `Avg_value_or_avg_length` varbinary(255) NOT NULL default '',
  `Std` varbinary(255) default NULL,
  `Optimal_fieldtype` varbinary(64) NOT NULL default ''
) ENGINE=MyISAM DEFAULT CHARSET=latin1
select * from t2;
Field_name	Min_value	Max_value	Min_length	Max_length	Empties_or_zeros	Nulls	Avg_value_or_avg_length	Std	Optimal_fieldtype
insert into t2 select * from t1 procedure analyse();
select * from t2;
Field_name	Min_value	Max_value	Min_length	Max_length	Empties_or_zeros	Nulls	Avg_value_or_avg_length	Std	Optimal_fieldtype
test.t1.a	1	2	1	1	0	0	1.5000	0.5000	ENUM('1','2') NOT NULL
drop table t1,t2;
create table t1 (v varchar(128));
insert into t1 values ('abc'),('abc\'def\\hij\"klm\0opq'),('\''),('\"'),('\\'),('a\0'),('b\''),('c\"'),('d\\'),('\'b'),('\"c'),('\\d'),('a\0\0\0b'),('a\'\'\'\'b'),('a\"\"\"\"b'),('a\\\\\\\\b'),('\'\0\\\"'),('\'\''),('\"\"'),('\\\\'),('The\ZEnd');
select * from t1 procedure analyse();
Field_name	Min_value	Max_value	Min_length	Max_length	Empties_or_zeros	Nulls	Avg_value_or_avg_length	Std	Optimal_fieldtype
test.t1.v	"	\\	1	19	0	0	3.7619	NULL	ENUM('"','""','"c','\'\0\\"','\'','\'\'','\'b','a\0\0\0b','a\0','a""""b','a\'\'\'\'b','abc','abc\'def\\hij"klm\0opq','a\\\\\\\\b','b\'','c"','d\\','The\ZEnd','\\','\\d','\\\\') NOT NULL
drop table t1;
create table t1 (df decimal(5,1));
insert into t1 values(1.1);
insert into t1 values(2.2);
select * from t1 procedure analyse();
Field_name	Min_value	Max_value	Min_length	Max_length	Empties_or_zeros	Nulls	Avg_value_or_avg_length	Std	Optimal_fieldtype
test.t1.df	1.1	2.2	13	13	0	0	1.65000	0.55000	ENUM('1.1','2.2') NOT NULL
drop table t1;
create table t1 (d double);
insert into t1 values (100000);
select * from t1 procedure analyse (1,1);
Field_name	Min_value	Max_value	Min_length	Max_length	Empties_or_zeros	Nulls	Avg_value_or_avg_length	Std	Optimal_fieldtype
test.t1.d	100000	100000	6	6	0	0	100000	0	MEDIUMINT(6) UNSIGNED NOT NULL
drop table t1;
create table t1 (product varchar(32), country_id int not null, year int,
profit int);
insert into t1  values ( 'Computer', 2,2000, 1200),
( 'TV', 1, 1999, 150),
( 'Calculator', 1, 1999,50),
( 'Computer', 1, 1999,1500),
( 'Computer', 1, 2000,1500),
( 'TV', 1, 2000, 150),
( 'TV', 2, 2000, 100),
( 'TV', 2, 2000, 100),
( 'Calculator', 1, 2000,75),
( 'Calculator', 2, 2000,75),
( 'TV', 1, 1999, 100),
( 'Computer', 1, 1999,1200),
( 'Computer', 2, 2000,1500),
( 'Calculator', 2, 2000,75),
( 'Phone', 3, 2003,10)
;
create table t2 (country_id int primary key, country char(20) not null);
insert into t2 values (1, 'USA'),(2,'India'), (3,'Finland');
select product, sum(profit),avg(profit) from t1 group by product with rollup procedure analyse();
Field_name	Min_value	Max_value	Min_length	Max_length	Empties_or_zeros	Nulls	Avg_value_or_avg_length	Std	Optimal_fieldtype
test.t1.product	Computer	TV	2	8	0	0	4.2500	NULL	ENUM('Computer','Phone','TV') NOT NULL
sum(profit)	10	6900	11	11	0	0	1946.2500	2867.6719	ENUM('10','275','600','6900') NOT NULL
avg(profit)	10.0000	1380.0000	16	16	0	0	394.68750000	570.20033144	ENUM('10.0000','68.7500','120.0000','1380.0000') NOT NULL
drop table t1,t2;