1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89
| --------------
START TRANSACTION
--------------
--------------
set session collation_connection = "latin1_general_ci"
--------------
--------------
DROP DATABASE IF EXISTS `base`
--------------
--------------
CREATE DATABASE IF NOT EXISTS `base`
DEFAULT CHARACTER SET `latin1`
DEFAULT COLLATE `latin1_general_ci`
--------------
--------------
DROP TABLE IF EXISTS `test`
--------------
--------------
CREATE TABLE `test`
( `id` integer unsigned NOT NULL auto_increment primary key,
`var3` integer unsigned NOT NULL
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
--------------
--------------
INSERT INTO `test` (`var3`) VALUES
(0),(0),(0),(1),(1),(1),(0),(0),(0),(0),(1),(1),(1),(0),(0),(0),(0),(0)
--------------
--------------
select * from `test`
--------------
+----+------+
| id | var3 |
+----+------+
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 0 |
| 11 | 1 |
| 12 | 1 |
| 13 | 1 |
| 14 | 0 |
| 15 | 0 |
| 16 | 0 |
| 17 | 0 |
| 18 | 0 |
+----+------+
--------------
SELECT id, var3
FROM ( SELECT @i:=if (var3<>@p,1,0) as test,
@p:=var3 as var3,
id as id
FROM ( select *
from `test`
order by id
) as x
CROSS JOIN ( SELECT @i:=0,@p:='' ) as y
) as z
WHERE test = 1
--------------
+----+------+
| id | var3 |
+----+------+
| 4 | 1 |
| 7 | 0 |
| 11 | 1 |
| 14 | 0 |
+----+------+
--------------
COMMIT
--------------
Appuyez sur une touche pour continuer... |
Partager