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