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set old_alter_table=0; create table bug53592(a int) engine=innodb row_format=compact; alter table bug53592 add column b text charset utf8; alter table bug53592 add column c blob not null; create index bug53592_b on bug53592(b(81)); create unique index bug53592_c on bug53592(c(1)); SET sql_mode = 'NO_ENGINE_SUBSTITUTION'; Warnings: Warning 3090 Changing sql mode 'NO_AUTO_CREATE_USER' is deprecated. It will be removed in a future release. replace into bug53592 values (),(); Warnings: Warning 1364 Field 'c' doesn't have a default value SET sql_mode = default; check table bug53592; Table Op Msg_type Msg_text test.bug53592 check status OK drop table bug53592; set old_alter_table=1; create table bug53592(a int) engine=innodb row_format=compact; alter table bug53592 add column b text charset utf8; alter table bug53592 add column c blob not null; create index bug53592_b on bug53592(b(81)); create unique index bug53592_c on bug53592(c(1)); SET sql_mode = 'NO_ENGINE_SUBSTITUTION'; Warnings: Warning 3090 Changing sql mode 'NO_AUTO_CREATE_USER' is deprecated. It will be removed in a future release. replace into bug53592 values (),(); Warnings: Warning 1364 Field 'c' doesn't have a default value SET sql_mode = default; check table bug53592; Table Op Msg_type Msg_text test.bug53592 check status OK drop table bug53592; CREATE TABLE bug53592_1( col1 int, col2 int, PRIMARY KEY (col1, col2) ) ENGINE=InnoDB; CREATE TABLE bug53592_2 ( col int PRIMARY KEY, FOREIGN KEY (col) REFERENCES bug53592_1 (col1) ON DELETE CASCADE ON UPDATE CASCADE ) ENGINE=InnoDB; INSERT INTO bug53592_1 VALUES (1, 2); INSERT INTO bug53592_1 VALUES (3, 4); INSERT INTO bug53592_2 VALUES (1); INSERT INTO bug53592_2 VALUES (3); UPDATE bug53592_1 SET col1 = 3 WHERE col2 = 2; ERROR 23000: Foreign key constraint for table 'bug53592_1', record '3-2' would lead to a duplicate entry in table 'bug53592_2', key 'PRIMARY' drop table bug53592_2; drop table bug53592_1;