SET @saved_stats_persistent = @@GLOBAL.innodb_stats_persistent; SET GLOBAL innodb_stats_persistent = OFF; create or replace table t1 ( x int unsigned, y int unsigned, sys_trx_start SYS_DATATYPE as row start invisible, sys_trx_end SYS_DATATYPE as row end invisible, period for system_time (sys_trx_start, sys_trx_end) ) with system versioning; insert into t1 (x, y) values (0, 100), (1, 101), (2, 102), (3, 103), (4, 104), (5, 105), (6, 106), (7, 107), (8, 108), (9, 109); set @t0= now(6); delete from t1 where x = 3; delete from t1 where x > 7; insert into t1(x, y) values(3, 33); select sys_trx_start from t1 where x = 3 and y = 33 into @t1; Warnings: Warning 1287 ' INTO FROM...' instead select x, y from t1; x y 0 100 1 101 2 102 4 104 5 105 6 106 7 107 3 33 select x as ASOF_x, y from t1 for system_time as of timestamp @t0; ASOF_x y 0 100 1 101 2 102 3 103 4 104 5 105 6 106 7 107 8 108 9 109 select x as FROMTO_x, y from t1 for system_time from timestamp '1970-01-01 00:00:00' to timestamp @t1; FROMTO_x y 0 100 1 101 2 102 3 103 4 104 5 105 6 106 7 107 8 108 9 109 select x as BETWAND_x, y from t1 for system_time between timestamp '1970-01-01 00:00:00' and timestamp @t1; BETWAND_x y 0 100 1 101 2 102 3 103 4 104 5 105 6 106 7 107 8 108 9 109 3 33 select x as ALL_x, y from t1 for system_time all; ALL_x y 0 100 1 101 2 102 3 103 4 104 5 105 6 106 7 107 8 108 9 109 3 33 ASOF2_x y 0 100 1 101 2 102 3 103 4 104 5 105 6 106 7 107 8 108 9 109 FROMTO2_x y 0 100 1 101 2 102 3 103 4 104 5 105 6 106 7 107 8 108 9 109 BETWAND2_x y 0 100 1 101 2 102 3 103 4 104 5 105 6 106 7 107 8 108 9 109 3 33 create or replace table t1 ( x int unsigned, y int unsigned ) with system versioning; create or replace table t2 ( x int unsigned, y int unsigned ) with system versioning; insert into t1 values (1, 1), (1, 2), (1, 3), (4, 4), (5, 5); insert into t2 values (1, 2), (2, 1), (3, 1); set @t0= now(6); select t1.x as IJ1_x1, t1.y as y1, t2.x as x2, t2.y as y2 from t1 inner join t2 on t1.x = t2.x; IJ1_x1 y1 x2 y2 1 1 1 2 1 2 1 2 1 3 1 2 select t1.x as LJ1_x1, t1.y as y1, t2.x as x2, t2.y as y2 from t1 left join t2 on t1.x = t2.x; LJ1_x1 y1 x2 y2 1 1 1 2 1 2 1 2 1 3 1 2 4 4 NULL NULL 5 5 NULL NULL select t1.x as RJ1_x1, t1.y as y1, t2.x as x2, t2.y as y2 from t1 right join t2 on t1.x = t2.x; RJ1_x1 y1 x2 y2 1 1 1 2 1 2 1 2 1 3 1 2 NULL NULL 2 1 NULL NULL 3 1 delete from t1; delete from t2; explain extended select * from (select t1.x as IJ2_x1, t1.y as y1, t2.x as x2, t2.y as y2 from t1 inner join t2 on t1.x = t2.x) for system_time as of timestamp @t0 as t; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 ALL NULL NULL NULL NULL 3 100.00 Using where 1 SIMPLE t1 ALL NULL NULL NULL NULL 5 100.00 Using where; Using join buffer (flat, BNL join) Warnings: Note 1003 select `test`.`t1`.`x` AS `IJ2_x1`,`test`.`t1`.`y` AS `y1`,`test`.`t2`.`x` AS `x2`,`test`.`t2`.`y` AS `y2` from `test`.`t1` FOR SYSTEM_TIME AS OF TIMESTAMP @`t0` join `test`.`t2` FOR SYSTEM_TIME AS OF TIMESTAMP @`t0` where `test`.`t1`.`x` = `test`.`t2`.`x` and `test`.`t2`.`row_end` > @`t0` and `test`.`t2`.`row_start` <= @`t0` and `test`.`t1`.`row_end` > @`t0` and `test`.`t1`.`row_start` <= @`t0` explain extended select * from (select t1.x as LJ2_x1, t1.y as y1, t2.x as x2, t2.y as y2 from t1 left join t2 on t1.x = t2.x) for system_time as of timestamp @t0 as t; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 5 100.00 Using where 1 SIMPLE t2 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (flat, BNL join) Warnings: Note 1003 select `test`.`t1`.`x` AS `LJ2_x1`,`test`.`t1`.`y` AS `y1`,`test`.`t2`.`x` AS `x2`,`test`.`t2`.`y` AS `y2` from `test`.`t1` FOR SYSTEM_TIME AS OF TIMESTAMP @`t0` left join `test`.`t2` FOR SYSTEM_TIME AS OF TIMESTAMP @`t0` on(`test`.`t2`.`x` = `test`.`t1`.`x` and `test`.`t2`.`row_end` > @`t0` and `test`.`t2`.`row_start` <= @`t0`) where `test`.`t1`.`row_end` > @`t0` and `test`.`t1`.`row_start` <= @`t0` explain extended select * from (select t1.x as RJ2_x1, t1.y as y1, t2.x as x2, t2.y as y2 from t1 right join t2 on t1.x = t2.x) for system_time as of timestamp @t0 as t; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 ALL NULL NULL NULL NULL 3 100.00 Using where 1 SIMPLE t1 ALL NULL NULL NULL NULL 5 100.00 Using where; Using join buffer (flat, BNL join) Warnings: Note 1003 select `test`.`t1`.`x` AS `RJ2_x1`,`test`.`t1`.`y` AS `y1`,`test`.`t2`.`x` AS `x2`,`test`.`t2`.`y` AS `y2` from `test`.`t2` FOR SYSTEM_TIME AS OF TIMESTAMP @`t0` left join `test`.`t1` FOR SYSTEM_TIME AS OF TIMESTAMP @`t0` on(`test`.`t1`.`x` = `test`.`t2`.`x` and `test`.`t1`.`row_end` > @`t0` and `test`.`t1`.`row_start` <= @`t0`) where `test`.`t2`.`row_end` > @`t0` and `test`.`t2`.`row_start` <= @`t0` select * from (select t1.x as IJ2_x1, t1.y as y1, t2.x as x2, t2.y as y2 from t1 inner join t2 on t1.x = t2.x) for system_time as of timestamp @t0 as t; IJ2_x1 y1 x2 y2 1 1 1 2 1 2 1 2 1 3 1 2 select * from (select t1.x as LJ2_x1, t1.y as y1, t2.x as x2, t2.y as y2 from t1 left join t2 on t1.x = t2.x) for system_time as of timestamp @t0 as t; LJ2_x1 y1 x2 y2 1 1 1 2 1 2 1 2 1 3 1 2 4 4 NULL NULL 5 5 NULL NULL select * from (select t1.x as RJ2_x1, t1.y as y1, t2.x as x2, t2.y as y2 from t1 right join t2 on t1.x = t2.x) for system_time as of timestamp @t0 as t; RJ2_x1 y1 x2 y2 1 1 1 2 1 2 1 2 1 3 1 2 NULL NULL 2 1 NULL NULL 3 1 drop table t1; drop table t2; create or replace table t1(x int) with system versioning; insert into t1 values (1); delete from t1; insert into t1 values (2); delete from t1; insert into t1 values (3); delete from t1; select row_start into @start1 from t1 for system_time all where x = 1; select row_end into @end1 from t1 for system_time all where x = 1; select row_start into @start2 from t1 for system_time all where x = 2; select row_end into @end2 from t1 for system_time all where x = 2; select row_start into @start3 from t1 for system_time all where x = 3; select row_end into @end3 from t1 for system_time all where x = 3; select x as ASOF_x from t1 for system_time as of @start2; ASOF_x 2 select x as ASOF_x from t1 for system_time as of @end2; ASOF_x select x as FROMTO_x from t1 for system_time from @start1 to @end3; FROMTO_x 1 2 3 select x as FROMTO_x from t1 for system_time from @end1 to @start2; FROMTO_x select x as BETWAND_x from t1 for system_time between @start1 and @end3; BETWAND_x 1 2 3 select x as BETWAND_x from t1 for system_time between @end1 and @start2; BETWAND_x 2 drop table t1; create table t1( A int ) with system versioning; insert into t1 values(1); select * from t1; A 1 create or replace table t1 (x int); insert into t1 values (1); select * from t1 for system_time all; ERROR HY000: Table `t1` is not system-versioned create or replace table t1 (x int) with system versioning; insert into t1 values (1); select * from t1 for system_time all for update; ERROR HY000: Table 't1' was locked with a READ lock and can't be updated create or replace table t1 (a int not null auto_increment primary key) with system versioning; select * from (t1 as t2 left join t1 as t3 using (a)) natural left join t1; a create or replace table t1 (a int) with system versioning; create or replace table t2 (a int) with system versioning; insert into t1 values(1); insert into t2 values(1); create view v1 as select * from t2 inner join t1 using (a); select * from v1; a 1 drop view v1; create or replace table t1 (a int) with system versioning; insert into t1 values (1); create view vt1 as select a from t1; select * from t1 natural join vt1; a 1 drop view vt1; create or replace table t1(x int) with system versioning; select * from (t1 as r left join t1 as u using (x)), t1; x x create or replace table t1 (a int) with system versioning; insert into t1 values (1); create trigger read_end after update on t1 for each row set @end = old.row_end; update t1 set a=2; select @end; @end MAX_RESULT create or replace table t1 (a int) with system versioning; create or replace table t2 (b int) with system versioning; insert into t1 values (1); insert into t2 values (2); select * from (select * from t1 cross join t2) as tmp; a b 1 2 select * from (select * from (select * from t1 cross join t2) as tmp1) as tmp2; a b 1 2 select * from (select * from t1 cross join t2 for system_time as of timestamp ('1970-01-01 00:00:00')) as tmp; a b create or replace table t1(a1 int) with system versioning; create or replace table t2(a2 int) with system versioning; insert into t1 values(1),(2); insert into t2 values(1),(2); select * from t1 for system_time all natural left join t2 for system_time all; a1 a2 1 1 2 1 1 2 2 2 create or replace table t1(a1 int) with system versioning; create or replace table t2(a2 int) with system versioning; insert into t1 values(1),(2); insert into t2 values(1),(2); create or replace view v1 as select a1 from t1; select * from v1 natural join t2; a1 a2 1 1 2 1 1 2 2 2 select * from v1 natural left join t2; a1 a2 1 1 2 1 1 2 2 2 select * from v1 natural right join t2; a2 a1 1 1 2 1 1 2 2 2 create or replace table t1 (a int) with system versioning; insert into t1 values (1); insert into t1 values (2); insert into t1 values (3); explain extended select * from t1 left outer join (t1 as t2 left join t1 as t3 using (a)) on t1.a>1; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where 1 SIMPLE t2 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (flat, BNL join) 1 SIMPLE t3 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (incremental, BNL join) Warnings: Note 1003 select `test`.`t1`.`a` AS `a`,`test`.`t2`.`a` AS `a` from `test`.`t1` left join (`test`.`t1` `t2` left join `test`.`t1` `t3` on(`test`.`t3`.`a` = `test`.`t2`.`a` and `test`.`t3`.`row_end` = TIMESTAMP'2038-01-19 03:14:07.999999')) on(`test`.`t2`.`row_end` = TIMESTAMP'2038-01-19 03:14:07.999999' and `test`.`t1`.`a` > 1) where `test`.`t1`.`row_end` = TIMESTAMP'2038-01-19 03:14:07.999999' select * from t1 left outer join (t1 as t2 left join t1 as t3 using (a)) on t1.a>1; a a 2 1 3 1 2 2 3 2 2 3 3 3 1 NULL create or replace table t1 (x int) with system versioning; create or replace table t2 (y int) with system versioning; insert into t1 values (1), (2), (3); delete from t1 where x = 3; insert into t2 values (1); select * from t1, t2 for system_time all; x y 1 1 2 1 select * from (select * from t1 for system_time all, t2 for system_time all) for system_time all as t; ERROR HY000: Table `t` is not system-versioned # TRANSACTION/TIMESTAMP specifier in SYSTEM_TIME [MDEV-14645, Issue #396] create or replace table t1 (x int) with system versioning engine myisam; select * from t1 for system_time as of transaction 1; ERROR HY000: Transaction-precise system versioning for `t1` is not supported # MDEV-18929 2nd execution of SP does not detect ER_VERS_NOT_VERSIONED create or replace procedure sp() select * from t1 for system_time as of transaction 1; call sp; ERROR HY000: Transaction-precise system versioning for `t1` is not supported call sp; ERROR HY000: Transaction-precise system versioning for `t1` is not supported create or replace table t1 (a int); create or replace procedure sp() select * from t1 for system_time all; call sp; ERROR HY000: Table `t1` is not system-versioned call sp; ERROR HY000: Table `t1` is not system-versioned drop procedure sp; create or replace table t1 ( x int, sys_trx_start bigint unsigned as row start invisible, sys_trx_end bigint unsigned as row end invisible, period for system_time (sys_trx_start, sys_trx_end) ) with system versioning engine innodb; insert into t1 values (1); set @ts= now(6); delete from t1; select sys_trx_start from t1 for system_time all into @trx_start; Warnings: Warning 1287 ' INTO FROM...' instead ## ensure @trx_start is much lower than unix timestamp select @trx_start < unix_timestamp(@ts) - 100 as trx_start_good; trx_start_good 1 ## TIMESTAMP specifier select x from t1 for system_time as of timestamp @ts; x 1 set @ts= timestamp'1-1-1 0:0:0'; select x from t1 for system_time as of timestamp @ts; x ## TRANSACTION specifier select x from t1 for system_time as of transaction @trx_start; x 1 ## no specifier (defaults to timestamp) select x from t1 for system_time as of @ts; x ### Issue #365, bug 4 (related to #226, optimized fields) create or replace table t1 (i int, b int) with system versioning; insert into t1 values (0, 0), (0, 0); select min(i) over (partition by b) as f from (select i + 0 as i, b from t1) as tt order by i; f 0 0 ### Issue #365, bug 5 (dangling AND) create or replace table t1 (a int); create or replace table t2 (b int) with system versioning; select * from t1 where exists (select 1 from t2 where t2.b = t1.a and t2.b = t1.a); a ### Issue #365, bug 9 (not a derived subquery) create or replace table t1 (x int) with system versioning; select t1.x in (select x from t1) a from t1, (select x from t1) b; a ### Issue #365, bug 10 (WHERE cond freed prematurely for PS) create or replace table t1 (x int) with system versioning; insert into t1 values (1); create or replace view v1 as select x from t1 where x = 1; prepare stmt from " select x from t1 where x in (select x from v1);"; execute stmt; x 1 execute stmt; x 1 ### Issue #365, bug 11 (WHERE cond not top level item) create or replace table t1 (a int, b int, key idx(a)) with system versioning; insert into t1 values (1, 1), (2, 2); select * from t1 where (a, 2) in ((1, 1), (2, 2)) and b = 1; a b ### Issue #398, NOW is now non-magic create or replace table t1 (x int) with system versioning; select * from t1 for system_time as of current_timestamp; x select * from t1 for system_time as of now; ERROR 42S22: Unknown column 'now' in 'FOR SYSTEM_TIME' ### Issue #405, NATURAL JOIN failure create or replace table t1 (a int) with system versioning; create or replace table t2 (b int); create or replace view v1 as select a, row_start, row_end from t1 where a > round(rand()*1000); select * from v1 natural join t2; a row_start row_end b # # Issue #406, MDEV-14633 Assertion on TRT read # create or replace table t1 (pk int primary key, i int, t time, key (i)) with system versioning; insert into t1 values (1, 10, '15:01:53'), (2, 20, '00:00:00'); delete from t1; select * from t1 where t = '00:00:00' and i > 0 and row_end <> '2012-12-12 00:00:00'; pk i t # # MDEV-14816 Assertion `join->best_read < double(1.797...e+308L)' failed in bool greedy_search # create or replace table t1 (f1 int) with system versioning; create or replace table t2 (f2 int) with system versioning; create or replace table t3 (f3 int); create or replace table t4 (f4 int); insert into t1 values (1), (2), (3), (4); insert into t2 values (1), (2), (3); insert into t3 values (1), (2); insert into t4 values (1); select * from t1 as t1a left join t2 as t2a left join (t3 as t3a inner join t1) on t2a.f2 = t3a.f3 on t1a.f1 = t2a.f2 left join (t2 join t3 inner join t4) on t2a.f2 = t1a.f1; f1 f2 f3 f1 f2 f3 f4 1 1 1 1 1 1 1 2 2 2 1 1 1 1 1 1 1 2 1 1 1 2 2 2 2 1 1 1 1 1 1 3 1 1 1 2 2 2 3 1 1 1 1 1 1 4 1 1 1 2 2 2 4 1 1 1 1 1 1 1 1 2 1 2 2 2 1 1 2 1 1 1 1 2 1 2 1 2 2 2 2 1 2 1 1 1 1 3 1 2 1 2 2 2 3 1 2 1 1 1 1 4 1 2 1 2 2 2 4 1 2 1 1 1 1 1 2 1 1 2 2 2 1 2 1 1 1 1 1 2 2 1 1 2 2 2 2 2 1 1 1 1 1 3 2 1 1 2 2 2 3 2 1 1 1 1 1 4 2 1 1 2 2 2 4 2 1 1 1 1 1 1 2 2 1 2 2 2 1 2 2 1 1 1 1 2 2 2 1 2 2 2 2 2 2 1 1 1 1 3 2 2 1 2 2 2 3 2 2 1 1 1 1 4 2 2 1 2 2 2 4 2 2 1 1 1 1 1 3 1 1 2 2 2 1 3 1 1 1 1 1 2 3 1 1 2 2 2 2 3 1 1 1 1 1 3 3 1 1 2 2 2 3 3 1 1 1 1 1 4 3 1 1 2 2 2 4 3 1 1 1 1 1 1 3 2 1 2 2 2 1 3 2 1 1 1 1 2 3 2 1 2 2 2 2 3 2 1 1 1 1 3 3 2 1 2 2 2 3 3 2 1 1 1 1 4 3 2 1 2 2 2 4 3 2 1 3 3 NULL NULL 1 1 1 3 3 NULL NULL 1 2 1 3 3 NULL NULL 2 1 1 3 3 NULL NULL 2 2 1 3 3 NULL NULL 3 1 1 3 3 NULL NULL 3 2 1 4 NULL NULL NULL NULL NULL NULL # # MDEV-15004 parser greedily parses AS OF TIMESTAMP # select timestamp'2016-02-30 08:07:06'; ERROR HY000: Incorrect DATETIME value: '2016-02-30 08:07:06' select * from t1 for system_time as of timestamp'2016-02-30 08:07:06'; ERROR HY000: Incorrect DATETIME value: '2016-02-30 08:07:06' select timestamp('2003-12-31 12:00:00','12:00:00'); timestamp('2003-12-31 12:00:00','12:00:00') 2004-01-01 00:00:00 select * from t1 for system_time as of timestamp('2003-12-31 12:00:00','12:00:00'); f1 # # MDEV-15391 Server crashes in JOIN::fix_all_splittings_in_plan or Assertion `join->best_read < double(1.79...e+308L)' failed [tempesta-tech#475] # create or replace table t1 (f1 int) with system versioning; insert t1 values (1),(2); create or replace table t2 (f2 int); create or replace table t3 (f3 int); create or replace table t4 (f4 int) with system versioning; select f1 from t1 join t2 left join t3 left join t4 on f3 = f4 on f3 = f2; f1 insert t2 values (1),(2); insert t3 values (1),(2); insert t4 values (1),(2); explain extended select f1 from t1 join t2 left join t3 left join t4 on f3 = f4 on f3 = f2; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00 Using where 1 SIMPLE t2 ALL NULL NULL NULL NULL 2 100.00 Using join buffer (flat, BNL join) 1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join) 1 SIMPLE t4 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join) Warnings: Note 1003 select `test`.`t1`.`f1` AS `f1` from `test`.`t1` join `test`.`t2` left join (`test`.`t3` left join `test`.`t4` on(`test`.`t4`.`f4` = `test`.`t2`.`f2` and `test`.`t4`.`row_end` = TIMESTAMP'2038-01-19 03:14:07.999999')) on(`test`.`t3`.`f3` = `test`.`t2`.`f2`) where `test`.`t1`.`row_end` = TIMESTAMP'2038-01-19 03:14:07.999999' drop view v1; drop table t1, t2, t3, t4; # # MDEV-15980 FOR SYSTEM_TIME BETWEEN and FROM .. TO work with negative intervals # create or replace table t1 ( a int, row_start SYS_DATATYPE as row start invisible, row_end SYS_DATATYPE as row end invisible, period for system_time (row_start, row_end) ) with system versioning; insert into t1 values (1); delete from t1; select row_start from t1 for system_time all into @t1; Warnings: Warning 1287 ' INTO FROM...' instead select row_end from t1 for system_time all into @t2; Warnings: Warning 1287 ' INTO FROM...' instead select * from t1 for system_time between @t1 and @t2; a 1 select * from t1 for system_time between @t2 and @t1; a select * from t1 for system_time from @t1 to @t2; a 1 select * from t1 for system_time from @t2 to @t1; a drop table t1; # # MDEV-15991 Server crashes in setup_on_expr upon calling SP or function executing DML on versioned tables # create or replace table t1 (i int); insert into t1 values (1); create or replace procedure p(n int) begin select * from t1; end $ call p(1); i 1 alter table t1 add system versioning; call p(2); i 1 call p(3); i 1 # # MDEV-15947 ASAN heap-use-after-free in Item_ident::print or in my_strcasecmp_utf8 or unexpected ER_BAD_FIELD_ERROR upon call of stored procedure reading from versioned table # create or replace table t1 (i int) with system versioning; create or replace procedure p() select * from t1; call p; i flush tables; call p; i call p; i drop procedure p; drop table t1; # # MDEV-21234 Server crashes in in setup_on_expr upon 3rd execution of SP # create table t1 (a varchar(8)); insert into t1 values ('foo'),('bar'); create table t2 (b date); create procedure pr() insert into t2 select * from t1; call pr; ERROR 22007: Incorrect date value: 'foo' for column `test`.`t2`.`b` at row 1 prepare stmt from 'insert into t2 select * from t1'; execute stmt; ERROR 22007: Incorrect date value: 'foo' for column `test`.`t2`.`b` at row 1 alter table t1 add system versioning; call pr; ERROR 22007: Incorrect date value: 'foo' for column `test`.`t2`.`b` at row 1 call pr; ERROR 22007: Incorrect date value: 'foo' for column `test`.`t2`.`b` at row 1 execute stmt; ERROR 22007: Incorrect date value: 'foo' for column `test`.`t2`.`b` at row 1 execute stmt; ERROR 22007: Incorrect date value: 'foo' for column `test`.`t2`.`b` at row 1 drop prepare stmt; drop procedure pr; drop table t1, t2; # # MDEV-23799 CREATE .. SELECT wrong result on join versioned table # create or replace table x (id Int) with system versioning; create or replace table x_p (elementId Int, pkey varchar(20), pvalue varchar(20)) with system versioning; insert into x values (1), (2), (3); insert into x_p values (1, 'gender', 'male'); insert into x_p values (2, 'gender', 'female'); insert into x_p values (3, 'gender', 'male'); create table tmp1 select xgender.pvalue as gender, xtitle.pvalue as title from x left join x_p as xgender on x.id = xgender.elementId and xgender.pkey = 'gender' left join x_p as xtitle on x.id = xtitle.elementId and xtitle.pkey = 'title'; select * from tmp1; gender title male NULL female NULL male NULL drop table tmp1; drop tables x, x_p; call verify_trt_dummy(34); No A B C D 1 1 1 1 1 2 1 1 1 1 3 1 1 1 1 4 1 1 1 1 5 1 1 1 1 6 1 1 1 1 7 1 1 1 1 8 1 1 1 1 9 1 1 1 1 10 1 1 1 1 11 1 1 1 1 12 1 1 1 1 13 1 1 1 1 14 1 1 1 1 15 1 1 1 1 16 1 1 1 1 17 1 1 1 1 18 1 1 1 1 19 1 1 1 1 20 1 1 1 1 21 1 1 1 1 22 1 1 1 1 23 1 1 1 1 24 1 1 1 1 25 1 1 1 1 26 1 1 1 1 27 1 1 1 1 28 1 1 1 1 29 1 1 1 1 30 1 1 1 1 31 1 1 1 1 32 1 1 1 1 33 1 1 1 1 34 1 1 1 1 SET GLOBAL innodb_stats_persistent = @saved_stats_persistent;