>Description:
If a null column is used in a unique index then mysql fails to throw a
key violation when multiple identical inserts (with nulls) are
performed.
>How-To-Repeat:
create table test (a int null, b int null);
alter table test add unique index index_ab (a,b);
insert into test (a,b) values(1,null);
insert into test (a,b) values(1,null);
insert into test (a,b) values(1,null);
select * from test;
+------+------+
| a | b |
+------+------+
| 1 | NULL |
| 1 | NULL |
| 1 | NULL |
+------+------+
3 rows in set (0.00 sec)
insert into test (a,b) values(1,1);
insert into test (a,b) values(1,1);
ERROR 1062: Duplicate entry '1-1' for key 1
>Fix:
No fix.
>Submitter-Id: <submitter ID>
>Originator: Jon Barker
>Organization:
>MySQL support: none
>Synopsis: NULLs don't work correctly in unique indexes.
>Severity: serious
>Priority:
>Category: mysql
>Class:
>Release: mysql-3.23.41 (Official MySQL RPM)
>Environment:
System: Linux x.catchword.co.uk 2.4.18ptixfs #11 Thu May 2 14:00:21 GMT 2002 i686
unknown
Architecture: i686
Some paths: /usr/bin/perl /usr/bin/make /usr/bin/gmake /usr/bin/gcc /usr/bin/cc
GCC: Reading specs from /usr/lib/gcc-lib/i586-mandrake-linux/2.96/specs
gcc version 2.96 20000731 (Linux-Mandrake 8.0 2.96-0.48mdk)
Compilation info: CC='egcs' CFLAGS='-O6 -fno-omit-frame-pointer -mpentium'
CXX='egcs' CXXFLAGS='-O6 -fno-omit-frame-pointer -felide-constructors
-fno-exceptions -fno-rtti -mpentium' LDFLAGS=''
LIBC:
lrwxrwxrwx 1 root root 13 Sep 28 2001 /lib/libc.so.6 -> libc-2.2.2.so
-rwxr-xr-x 1 root root 1216268 Feb 21 2001 /lib/libc-2.2.2.so
-rw-r--r-- 1 root root 26366908 Feb 21 2001 /usr/lib/libc.a
-rw-r--r-- 1 root root 178 Feb 21 2001 /usr/lib/libc.so
Configure command: ./configure --disable-shared --with-mysqld-ldflags=-all-static
--with-client-ldflags=-all-static --without-berkeley-db --without-innodb
--enable-assembler --with-mysqld-user=mysql
--with-unix-socket-path=/var/lib/mysql/mysql.sock --prefix=/
--with-extra-charsets=complex --exec-prefix=/usr --libexecdir=/usr/sbin
--sysconfdir=/etc --datadir=/usr/share --localstatedir=/var/lib/mysql
--infodir=/usr/info --includedir=/usr/include --mandir=/usr/man
'--with-comment=Official MySQL RPM'
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