File: unique_key.result

package info (click to toggle)
mariadb-10.5 1%3A10.5.23-0%2Bdeb11u1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 712,240 kB
  • sloc: ansic: 2,158,658; cpp: 1,843,101; asm: 297,745; perl: 59,967; sh: 53,869; pascal: 38,348; java: 33,919; yacc: 19,639; python: 11,119; xml: 10,126; sql: 10,027; ruby: 8,544; makefile: 6,343; cs: 2,866; lex: 1,205; javascript: 1,037; objc: 80; tcl: 73; awk: 46; php: 22; sed: 16
file content (57 lines) | stat: -rw-r--r-- 825 bytes parent folder | download | duplicates (5) 
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
 
connection node_2;
connection node_1;
#
# MDEV#5552 Deadlock when inserting NULL column value in column with
# UNIQUE index
#
USE test;

# On node_1
connection node_1;
CREATE TABLE t1(c1 INT DEFAULT NULL, UNIQUE KEY c1(c1)) ENGINE=INNODB;
INSERT INTO t1 VALUES (NULL);
INSERT INTO t1 VALUES (NULL);
SELECT * FROM test.t1;
c1
NULL
NULL

# On node_2
connection node_2;
SELECT * FROM test.t1;
c1
NULL
NULL

# On node_1
connection node_1;
INSERT INTO t1 VALUES (1);
UPDATE t1 SET c1=NULL WHERE c1=1;
SELECT * FROM test.t1;
c1
NULL
NULL
NULL

# On node_2
connection node_2;
SELECT * FROM test.t1;
c1
NULL
NULL
NULL

# On node_1
connection node_1;
DELETE FROM t1 WHERE c1<=>NULL;
SELECT * FROM test.t1;
c1

# On node_2
connection node_2;
SELECT * FROM test.t1;
c1
DROP TABLE t1;
disconnect node_2;
disconnect node_1;
# End of test