CREATE TABLE bug38999_1 (a int not null primary key, b int not null, key (b)) engine=innodb;
CREATE TABLE bug38999_2 (a int not null primary key, b int not null, key (b)) engine=innodb;
INSERT INTO bug38999_1 values (1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(7,7),(8,8),(9,9),(10,10),(11,11),(12,12);
INSERT INTO bug38999_2 values (1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(7,7),(8,8),(9,9);
update bug38999_1,bug38999_2 set bug38999_1.a=bug38999_1.a+100;
select * from bug38999_1;
a b
101 1
102 2
103 3
104 4
105 5
106 6
107 7
108 8
109 9
110 10
111 11
112 12
update bug38999_1,bug38999_2 set bug38999_1.a=bug38999_1.a+100 where bug38999_1.a=101;
select * from bug38999_1;
a b
201 1
102 2
103 3
104 4
105 5
106 6
107 7
108 8
109 9
110 10
111 11
112 12
update bug38999_1,bug38999_2 set bug38999_1.b=bug38999_1.b+10 where bug38999_1.b=2;
select * from bug38999_1;
a b
201 1
103 3
104 4
105 5
106 6
107 7
108 8
109 9
110 10
111 11
102 12
112 12
update bug38999_1,bug38999_2 set bug38999_1.b=bug38999_1.b+2,bug38999_2.b=bug38999_1.b+10 where bug38999_1.b between 3 and 5 and bug38999_1.a=bug38999_2.a+100;