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SET @@session.storage_engine = 'MyISAM';
# - UNIQUE KEY
# - INDEX
# - FULLTEXT INDEX
# - SPATIAL INDEX (not supported)
# - FOREIGN INDEX (partially supported)
# - CHECK (allowed but not used)
# UNIQUE
create table t1 (a int, b int as (a*2) unique);
ERROR HY000: Key/Index cannot be defined on a non-stored computed column
create table t1 (a int, b int as (a*2) persistent unique);
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` int(11) DEFAULT NULL,
`b` int(11) AS (a*2) PERSISTENT,
UNIQUE KEY `b` (`b`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
describe t1;
Field Type Null Key Default Extra
a int(11) YES NULL
b int(11) YES UNI NULL PERSISTENT
drop table t1;
create table t1 (a int, b int as (a*2), unique key (b));
ERROR HY000: Key/Index cannot be defined on a non-stored computed column
create table t1 (a int, b int as (a*2) persistent, unique (b));
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` int(11) DEFAULT NULL,
`b` int(11) AS (a*2) PERSISTENT,
UNIQUE KEY `b` (`b`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
describe t1;
Field Type Null Key Default Extra
a int(11) YES NULL
b int(11) YES UNI NULL PERSISTENT
drop table t1;
create table t1 (a int, b int as (a*2));
alter table t1 add unique key (b);
ERROR HY000: Key/Index cannot be defined on a non-stored computed column
drop table t1;
create table t1 (a int, b int as (a*2) persistent);
alter table t1 add unique key (b);
drop table t1;
# Testing data manipulation operations involving UNIQUE keys
# on virtual columns can be found in:
# - vcol_ins_upd.inc
# - vcol_select.inc
#
# INDEX
create table t1 (a int, b int as (a*2), index (b));
ERROR HY000: Key/Index cannot be defined on a non-stored computed column
create table t1 (a int, b int as (a*2), index (a,b));
ERROR HY000: Key/Index cannot be defined on a non-stored computed column
create table t1 (a int, b int as (a*2) persistent, index (b));
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` int(11) DEFAULT NULL,
`b` int(11) AS (a*2) PERSISTENT,
KEY `b` (`b`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
describe t1;
Field Type Null Key Default Extra
a int(11) YES NULL
b int(11) YES MUL NULL PERSISTENT
drop table t1;
create table t1 (a int, b int as (a*2) persistent, index (a,b));
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` int(11) DEFAULT NULL,
`b` int(11) AS (a*2) PERSISTENT,
KEY `a` (`a`,`b`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
describe t1;
Field Type Null Key Default Extra
a int(11) YES MUL NULL
b int(11) YES NULL PERSISTENT
drop table t1;
create table t1 (a int, b int as (a*2));
alter table t1 add index (b);
ERROR HY000: Key/Index cannot be defined on a non-stored computed column
alter table t1 add index (a,b);
ERROR HY000: Key/Index cannot be defined on a non-stored computed column
drop table t1;
create table t1 (a int, b int as (a*2) persistent);
alter table t1 add index (b);
drop table t1;
create table t1 (a int, b int as (a*2) persistent);
alter table t1 add index (a,b);
create table t2 like t1;
drop table t2;
drop table t1;
# Testing data manipulation operations involving INDEX
# on virtual columns can be found in:
# - vcol_select.inc
#
# TODO: FULLTEXT INDEX
# SPATIAL INDEX
# Error "All parts of a SPATIAL index must be NOT NULL"
create table t1 (a int, b geometry as (a+1) persistent, spatial index (b));
ERROR 42000: All parts of a SPATIAL index must be NOT NULL
create table t1 (a int, b int as (a+1) persistent);
alter table t1 add spatial index (b);
ERROR HY000: Incorrect arguments to SPATIAL INDEX
drop table t1;
# FOREIGN KEY
# Rejected FK options.
create table t1 (a int, b int as (a+1) persistent,
foreign key (b) references t2(a) on update set null);
ERROR HY000: Cannot define foreign key with ON UPDATE SET NULL clause on a computed column
create table t1 (a int, b int as (a+1) persistent,
foreign key (b) references t2(a) on update cascade);
ERROR HY000: Cannot define foreign key with ON UPDATE CASCADE clause on a computed column
create table t1 (a int, b int as (a+1) persistent,
foreign key (b) references t2(a) on delete set null);
ERROR HY000: Cannot define foreign key with ON DELETE SET NULL clause on a computed column
create table t1 (a int, b int as (a+1) persistent);
alter table t1 add foreign key (b) references t2(a) on update set null;
ERROR HY000: Cannot define foreign key with ON UPDATE SET NULL clause on a computed column
alter table t1 add foreign key (b) references t2(a) on update cascade;
ERROR HY000: Cannot define foreign key with ON UPDATE CASCADE clause on a computed column
alter table t1 add foreign key (b) references t2(a) on delete set null;
ERROR HY000: Cannot define foreign key with ON DELETE SET NULL clause on a computed column
drop table t1;
create table t1 (a int, b int as (a+1),
foreign key (b) references t2(a));
ERROR HY000: Key/Index cannot be defined on a non-stored computed column
create table t1 (a int, b int as (a+1));
alter table t1 add foreign key (b) references t2(a);
ERROR HY000: Key/Index cannot be defined on a non-stored computed column
drop table t1;
# Allowed FK options.
create table t2 (a int primary key, b char(5));
create table t1 (a int, b int as (a % 10) persistent,
foreign key (b) references t2(a) on update restrict);
drop table t1;
create table t1 (a int, b int as (a % 10) persistent,
foreign key (b) references t2(a) on update no action);
drop table t1;
create table t1 (a int, b int as (a % 10) persistent,
foreign key (b) references t2(a) on delete restrict);
drop table t1;
create table t1 (a int, b int as (a % 10) persistent,
foreign key (b) references t2(a) on delete cascade);
drop table t1;
create table t1 (a int, b int as (a % 10) persistent,
foreign key (b) references t2(a) on delete no action);
drop table t1;
# Testing data manipulation operations involving FOREIGN KEY
# on virtual columns can be found in:
# - vcol_ins_upd.inc
# - vcol_select.inc
#
# TODO: CHECK
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