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SET AUTOCOMMIT = 0
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START TRANSACTION
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DROP DATABASE IF EXISTS `base`
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CREATE DATABASE `base`
DEFAULT CHARACTER SET `latin1`
DEFAULT COLLATE `latin1_general_ci`
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DROP TABLE IF EXISTS `test`
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CREATE TABLE `test` (
`date` date NOT NULL,
`lib` char(08) NOT NULL,
`id` int unsigned NOT NULL
) ENGINE=MyIsam
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
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insert into `test` (`date`,`lib`,`id`) values
('1995-07-05', 'alpha', 12),
('2007-12-17', 'beta', 17),
('2001-05-03', 'gamma', 24),
('2010-10-27', 'delta', 8),
('2010-10-27', 'epzilon', 5),
('2010-11-05', 'dzeta', 9),
('2008-08-08', 'eta', 3),
('2012-12-12', 'theta', 11),
('2015-04-07', 'iota', 18),
('2003-03-19', 'kappa', 13),
('2004-05-12', 'lambda', 2),
('2011-11-11', 'mu', 6),
('2007-02-24', 'nu', 20),
('1998-01-15', 'xi', 22),
('1999-09-12', 'omicron', 1),
('1994-08-17', 'pi', 15),
('2006-06-06', 'rho', 7),
('2011-04-21', 'signma', 16),
('2001-01-01', 'tau', 10),
('1997-12-21', 'upsilon', 21),
('2005-07-24', 'phi', 4),
('2009-07-27', 'khi', 19),
('2003-08-15', 'psi', 14),
('2005-05-05', 'omega', 23)
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ALTER TABLE `test` order by date, lib
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ALTER TABLE `test` ADD PRIMARY KEY `clef` (`date`,`lib`),
ADD UNIQUE INDEX `idx1` (`id`)
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describe test
--------------
+-------+------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+------------------+------+-----+---------+-------+
| date | date | NO | PRI | NULL | |
| lib | char(8) | NO | PRI | NULL | |
| id | int(10) unsigned | NO | UNI | NULL | |
+-------+------------------+------+-----+---------+-------+
--------------
explain select * from test
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+----+-------------+-------+------+---------------+------+---------+------+------+-------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+-------+------+---------------+------+---------+------+------+-------+
| 1 | SIMPLE | test | ALL | NULL | NULL | NULL | NULL | 24 | NULL |
+----+-------------+-------+------+---------------+------+---------+------+------+-------+
--------------
select * from test
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+------------+---------+----+
| date | lib | id |
+------------+---------+----+
| 1994-08-17 | pi | 15 |
| 1995-07-05 | alpha | 12 |
| 1997-12-21 | upsilon | 21 |
| 1998-01-15 | xi | 22 |
| 1999-09-12 | omicron | 1 |
| 2001-01-01 | tau | 10 |
| 2001-05-03 | gamma | 24 |
| 2003-03-19 | kappa | 13 |
| 2003-08-15 | psi | 14 |
| 2004-05-12 | lambda | 2 |
| 2005-05-05 | omega | 23 |
| 2005-07-24 | phi | 4 |
| 2006-06-06 | rho | 7 |
| 2007-02-24 | nu | 20 |
| 2007-12-17 | beta | 17 |
| 2008-08-08 | eta | 3 |
| 2009-07-27 | khi | 19 |
| 2010-10-27 | delta | 8 |
| 2010-10-27 | epzilon | 5 |
| 2010-11-05 | dzeta | 9 |
| 2011-04-21 | signma | 16 |
| 2011-11-11 | mu | 6 |
| 2012-12-12 | theta | 11 |
| 2015-04-07 | iota | 18 |
+------------+---------+----+
--------------
explain select date, lib from test where lib like 'p%' and date between '2003-01-01' and '2003-12-31'
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+----+-------------+-------+-------+---------------+---------+---------+------+------+--------------------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+-------+-------+---------------+---------+---------+------+------+--------------------------+
| 1 | SIMPLE | test | range | PRIMARY | PRIMARY | 11 | NULL | 2 | Using where; Using index |
+----+-------------+-------+-------+---------------+---------+---------+------+------+--------------------------+
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select date, lib from test where lib like 'p%' and date between '2003-01-01' and '2003-12-31'
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+------------+-----+
| date | lib |
+------------+-----+
| 2003-08-15 | psi |
+------------+-----+
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explain select * from test where id = 15
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+----+-------------+-------+-------+---------------+------+---------+-------+------+-------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+-------+-------+---------------+------+---------+-------+------+-------+
| 1 | SIMPLE | test | const | idx1 | idx1 | 4 | const | 1 | NULL |
+----+-------------+-------+-------+---------------+------+---------+-------+------+-------+
--------------
select * from test where id = 15
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+------------+-----+----+
| date | lib | id |
+------------+-----+----+
| 1994-08-17 | pi | 15 |
+------------+-----+----+
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COMMIT
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SET AUTOCOMMIT = 1
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