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SET @@session.default_storage_engine = 'MyISAM'; # Case 1. All non-stored columns. create table t1 (a int generated always as (2+3) virtual); insert into t1 values (default); select * from t1; a 5 insert into t1 values (default); select * from t1; a 5 5 drop table t1; # Case 2. CREATE # - Column1: "real" # - Column 2: virtual non-stored create table t1 (a int, b int generated always as (-a) virtual); insert into t1 values (1,default); select * from t1; a b 1 -1 insert into t1 values (2,default); select * from t1 order by a; a b 1 -1 2 -2 drop table t1; # Case 3. CREATE # - Column1: "real" # - Column 2: virtual stored create table t1 (a int, b int generated always as (-a) stored); insert into t1 values (1,default); select * from t1; a b 1 -1 insert into t1 values (2,default); select * from t1 order by a; a b 1 -1 2 -2 drop table t1; # Case 4. CREATE # - Column1: virtual non-stored # - Column2: "real" create table t1 (a int generated always as (-b) virtual, b int); insert into t1 values (default,1); select * from t1; a b -1 1 insert into t1 values (default,2); select * from t1 order by a; a b -2 2 -1 1 drop table t1; # Case 5. CREATE # - Column1: virtual stored # - Column2: "real" create table t1 (a int generated always as (-b) stored, b int); insert into t1 values (default,1); select * from t1; a b -1 1 insert into t1 values (default,2); select * from t1 order by a; a b -2 2 -1 1 drop table t1; # Case 6. CREATE # - Column1: "real" # - Column2: virtual non-stored # - Column3: virtual stored create table t1 (a int, b int generated always as (-a), c int generated always as (-a) stored); insert into t1 values (1,default,default); select * from t1; a b c 1 -1 -1 insert into t1 values (2,default,default); select * from t1 order by a; a b c 1 -1 -1 2 -2 -2 drop table t1; # Case 7. ALTER. Modify virtual stored -> virtual non-stored create table t1 (a int, b int generated always as (a % 2) stored); alter table t1 modify b int generated always as (a % 2) virtual; ERROR HY000: 'Changing the STORED status' is not supported for generated columns. show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(11) DEFAULT NULL, `b` int(11) GENERATED ALWAYS AS ((`a` % 2)) STORED ) ENGINE=MyISAM DEFAULT CHARSET=latin1 drop table t1; # Case 8. ALTER. Modify virtual non-stored -> virtual stored create table t1 (a int, b int generated always as (a % 2) virtual); alter table t1 modify b int generated always as (a % 2) stored; ERROR HY000: 'Changing the STORED status' is not supported for generated columns. show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(11) DEFAULT NULL, `b` int(11) GENERATED ALWAYS AS ((`a` % 2)) VIRTUAL ) ENGINE=MyISAM DEFAULT CHARSET=latin1 drop table t1; # Case 9. CREATE LIKE # - Column1: "real" # - Column2: virtual non-stored # - Column3: virtual stored create table t1 (a int, b int generated always as (-a), c int generated always as (-a) stored); create table t2 like t1; insert into t2 values (1,default,default); select * from t2; a b c 1 -1 -1 insert into t2 values (2,default,default); select * from t2 order by a; a b c 1 -1 -1 2 -2 -2 drop table t2; drop table t1; # Case 10. ALTER. Dropping a virtual non-stored column. # - Column1: virtual non-stored # - Column2: "real" create table t1 (a int generated always as (-b) virtual, b int, c varchar(5)); insert into t1 values (default,1,'v1'); insert into t1 values (default,2,'v2'); select * from t1 order by b; a b c -1 1 v1 -2 2 v2 alter table t1 drop column a; select * from t1 order by b; b c 1 v1 2 v2 show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `b` int(11) DEFAULT NULL, `c` varchar(5) DEFAULT NULL ) ENGINE=MyISAM DEFAULT CHARSET=latin1 drop table t1; # Case 11. ALTER. Dropping a virtual stored column. # - Column1: virtual stored # - Column2: "real" create table t1 (a int generated always as (-b) stored, b int, c char(5)); insert into t1 values (default,1,'v1'); insert into t1 values (default,2,'v2'); select * from t1 order by b; a b c -1 1 v1 -2 2 v2 alter table t1 drop column a; select * from t1 order by b; b c 1 v1 2 v2 show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `b` int(11) DEFAULT NULL, `c` char(5) DEFAULT NULL ) ENGINE=MyISAM DEFAULT CHARSET=latin1 drop table t1; # Case 12. ALTER. Adding a new virtual non-stored column. create table t1 (a int, b datetime); insert into t1 values (1,'2008-09-04'); insert into t1 values (2,'2008-09-05'); select * from t1 order by a; a b 1 2008-09-04 00:00:00 2 2008-09-05 00:00:00 alter table t1 add column c int generated always as (dayofyear(b)) virtual after a; select * from t1 order by a; a c b 1 248 2008-09-04 00:00:00 2 249 2008-09-05 00:00:00 show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(11) DEFAULT NULL, `c` int(11) GENERATED ALWAYS AS (dayofyear(`b`)) VIRTUAL, `b` datetime DEFAULT NULL ) ENGINE=MyISAM DEFAULT CHARSET=latin1 drop table t1; # Case 13. ALTER. Adding a new virtual stored column. create table t1 (a int, b datetime); insert into t1 values (1,'2008-09-04'); insert into t1 values (2,'2008-09-05'); select * from t1 order by a; a b 1 2008-09-04 00:00:00 2 2008-09-05 00:00:00 alter table t1 add column c int generated always as (dayofyear(b)) stored after a; select * from t1 order by a; a c b 1 248 2008-09-04 00:00:00 2 249 2008-09-05 00:00:00 show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(11) DEFAULT NULL, `c` int(11) GENERATED ALWAYS AS (dayofyear(`b`)) STORED, `b` datetime DEFAULT NULL ) ENGINE=MyISAM DEFAULT CHARSET=latin1 drop table t1; # Case 14. ALTER. Changing the expression of a virtual stored column. create table t1 (a int, b datetime, c int generated always as (week(b)) stored); insert into t1 values (1,'2008-09-04',default); insert into t1 values (2,'2008-09-05',default); select * from t1 order by a; a b c 1 2008-09-04 00:00:00 35 2 2008-09-05 00:00:00 35 alter table t1 change column c c int generated always as (week(b,1)) stored; select * from t1 order by a; a b c 1 2008-09-04 00:00:00 36 2 2008-09-05 00:00:00 36 show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(11) DEFAULT NULL, `b` datetime DEFAULT NULL, `c` int(11) GENERATED ALWAYS AS (week(`b`,1)) STORED ) ENGINE=MyISAM DEFAULT CHARSET=latin1 drop table t1; # Case 15. ALTER. Changing the expression of a virtual non-stored column. create table t1 (a int, b datetime, c int generated always as (week(b)) virtual); insert into t1 values (1,'2008-09-04',default); insert into t1 values (2,'2008-09-05',default); select * from t1 order by a; a b c 1 2008-09-04 00:00:00 35 2 2008-09-05 00:00:00 35 alter table t1 change column c c int generated always as (week(b,1)) virtual; select * from t1 order by a; a b c 1 2008-09-04 00:00:00 36 2 2008-09-05 00:00:00 36 show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(11) DEFAULT NULL, `b` datetime DEFAULT NULL, `c` int(11) GENERATED ALWAYS AS (week(`b`,1)) VIRTUAL ) ENGINE=MyISAM DEFAULT CHARSET=latin1 drop table t1; DROP VIEW IF EXISTS v1,v2; DROP TABLE IF EXISTS t1,t2,t3; DROP PROCEDURE IF EXISTS p1; DROP FUNCTION IF EXISTS f1; DROP TRIGGER IF EXISTS trg1; DROP TRIGGER IF EXISTS trg2; set sql_warnings = 0;