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214 lines
6.9 KiB
Text
214 lines
6.9 KiB
Text
SET NAMES utf8mb4;
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SELECT NATURAL_SORT_KEY(NULL);
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NATURAL_SORT_KEY(NULL)
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NULL
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SELECT NATURAL_SORT_KEY(repeat('a1',@@max_allowed_packet/2-1));
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NATURAL_SORT_KEY(repeat('a1',@@max_allowed_packet/2-1))
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NULL
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Warnings:
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Warning 1301 Result of natural_sort_key() was larger than max_allowed_packet (16777216) - truncated
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SELECT NATURAL_SORT_KEY(repeat('1',@@max_allowed_packet-1));
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NATURAL_SORT_KEY(repeat('1',@@max_allowed_packet-1))
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NULL
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Warnings:
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Warning 1301 Result of natural_sort_key() was larger than max_allowed_packet (16777216) - truncated
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CREATE TABLE t1(
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c VARCHAR(30) CHARACTER SET latin1 COLLATE latin1_bin,
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k VARCHAR(60) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci AS (NATURAL_SORT_KEY(CONVERT(c USING utf8mb4))) VIRTUAL INVISIBLE);
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INSERT INTO t1 values
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('A1'),('a1'),('A100'),('a100'),('A2'),('ä2'),('a2'),('A99'),
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('äb'),('B1'),('B100'),('B9'),('C'),('100');
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#Natural sort order.
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SELECT c FROM t1 ORDER BY k,c;
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c
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100
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A1
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a1
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A2
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a2
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ä2
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A99
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A100
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a100
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äb
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B1
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B9
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B100
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C
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#Unnatural but unicode aware) sort order
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SELECT c FROM t1 ORDER BY CONVERT(c USING utf8mb4) COLLATE utf8mb4_unicode_ci,c;
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c
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100
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A1
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a1
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A100
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a100
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A2
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a2
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ä2
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A99
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äb
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B1
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B100
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B9
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C
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CREATE TABLE t2 AS SELECT c, NATURAL_SORT_KEY(c) FROM t1 WHERE 0;
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SHOW CREATE TABLE t2;
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Table Create Table
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t2 CREATE TABLE `t2` (
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`c` varchar(30) CHARACTER SET latin1 COLLATE latin1_bin DEFAULT NULL,
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`NATURAL_SORT_KEY(c)` varchar(45) CHARACTER SET latin1 COLLATE latin1_bin DEFAULT NULL
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) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
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DROP TABLE t1,t2;
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CREATE TABLE t1(c VARCHAR(1), k VARCHAR(2) AS (NATURAL_SORT_KEY(c)) STORED);
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ERROR HY000: Function or expression 'natural_sort_key()' cannot be used in the GENERATED ALWAYS AS clause of `k`
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SELECT RPAD(val,28,' ') value , RPAD(NATURAL_SORT_KEY(val),36,' ') sortkey , LENGTH(NATURAL_SORT_KEY(val)) - LENGTH(val) encoding_overhead
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FROM
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(
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SELECT '0' val
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UNION SELECT seq FROM seq_1_to_9
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UNION SELECT CONCAT('1',repeat('0',seq)) FROM seq_1_to_27
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) AS numbers ORDER BY sortkey;
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value sortkey encoding_overhead
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0 00 1
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1 01 1
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2 02 1
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3 03 1
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4 04 1
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5 05 1
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6 06 1
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7 07 1
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8 08 1
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9 09 1
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10 110 1
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100 2100 1
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1000 31000 1
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10000 410000 1
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100000 5100000 1
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1000000 61000000 1
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10000000 710000000 1
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100000000 8100000000 1
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1000000000 901000000000 2
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10000000000 9110000000000 2
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100000000000 92100000000000 2
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1000000000000 931000000000000 2
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10000000000000 9410000000000000 2
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100000000000000 95100000000000000 2
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1000000000000000 961000000000000000 2
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10000000000000000 9710000000000000000 2
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100000000000000000 98100000000000000000 2
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1000000000000000000 9901000000000000000000 3
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10000000000000000000 99110000000000000000000 3
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100000000000000000000 992100000000000000000000 3
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1000000000000000000000 9931000000000000000000000 3
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10000000000000000000000 99410000000000000000000000 3
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100000000000000000000000 995100000000000000000000000 3
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1000000000000000000000000 9961000000000000000000000000 3
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10000000000000000000000000 99710000000000000000000000000 3
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100000000000000000000000000 998100000000000000000000000000 3
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1000000000000000000000000000 99901271000000000000000000000000000 7
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SELECT natural_sort_key('1') = natural_sort_key('0001');
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natural_sort_key('1') = natural_sort_key('0001')
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1
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SELECT natural_sort_key('1.1') = natural_sort_key('1.00001');
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natural_sort_key('1.1') = natural_sort_key('1.00001')
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1
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SELECT RPAD(val,20,' ') value, NATURAL_SORT_KEY(val) FROM
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(SELECT '' val WHERE 0 UNION VALUES
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('fred'),
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('pic2'),
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('pic100a'),
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('pic120'),
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('pic121'),
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('jane'),
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('tom'),
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('pic02a'),
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('pic3'),
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('pic4'),
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('1-20'),
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('pic100'),
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('pic02000'),
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('10-20'),
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('1-02'),
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('1-2'),
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('pic01'),
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('pic02'),
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('pic 6'),
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('pic 7'),
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('pic 5'),
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('pic05'),
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('pic 5 '),
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('pic 5 something'),
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('pic 4 else'),
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('2000-1-10'),
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('1999-12-25'),
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('1999-3-3'),
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('2000-3-23'),
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('2000-1-2'),
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('100.200.300.400'),
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('100.50.60.70'),
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('100.8.9.0'),
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('a1b1'),
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('a01b2'),
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('a1b2'),
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('a01b3')
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)AS data ORDER BY 2,1;
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value NATURAL_SORT_KEY(val)
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1-02 01-02
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1-2 01-02
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1-20 01-120
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10-20 110-120
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100.8.9.0 2100.08.09.00
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100.50.60.70 2100.150.160.170
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100.200.300.400 2100.2200.2300.2400
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1999-3-3 31999-03-03
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1999-12-25 31999-112-125
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2000-1-2 32000-01-02
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2000-1-10 32000-01-110
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2000-3-23 32000-03-123
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a1b1 a01b01
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a01b2 a01b02
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a1b2 a01b02
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a01b3 a01b03
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fred fred
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jane jane
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pic 7 pic 07
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pic 4 else pic 04 else
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pic 5 pic 05
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pic 5 something pic 05 something
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pic 6 pic 06
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pic01 pic01
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pic02 pic02
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pic2 pic02
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pic02a pic02a
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pic3 pic03
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pic4 pic04
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pic05 pic05
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pic100 pic2100
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pic100a pic2100a
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pic120 pic2120
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pic121 pic2121
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pic02000 pic32000
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tom tom
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create table t (a varchar(8), b varchar(8) as (natural_sort_key(a)));
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insert into t (a) values ('a2'),(NULL),('a11');
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select * from t order by b;
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a b
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NULL NULL
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a2 a02
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a11 a111
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select a, b from t order by b;
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a b
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NULL NULL
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a2 a02
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a11 a111
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drop table t;
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select natural_sort_key(_utf16 0x0031),natural_sort_key(_ucs2 0x0031), natural_sort_key(_utf32 0x00000031);
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natural_sort_key(_utf16 0x0031) natural_sort_key(_ucs2 0x0031) natural_sort_key(_utf32 0x00000031)
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01 01 01
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select get_lock('a', 0);
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get_lock('a', 0)
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1
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select natural_sort_key(release_lock('a'));
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natural_sort_key(release_lock('a'))
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01
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