drop table if exists t1; CREATE TABLE t1 ( gesuchnr int(11) DEFAULT '0' NOT NULL, benutzer_id int(11) DEFAULT '0' NOT NULL, PRIMARY KEY (gesuchnr,benutzer_id) ); replace into t1 (gesuchnr,benutzer_id) values (2,1); replace into t1 (gesuchnr,benutzer_id) values (1,1); replace into t1 (gesuchnr,benutzer_id) values (1,1); alter table t1 engine=heap; replace into t1 (gesuchnr,benutzer_id) values (1,1); drop table t1; create table t1 (a tinyint not null auto_increment primary key, b char(20) default "default_value"); insert into t1 values (126,"first"),(63, "middle"),(0,"last"); insert into t1 values (0,"error"); ERROR 22003: Out of range value for column 'a' at row 1 replace into t1 values (0,"error"); ERROR 22003: Out of range value for column 'a' at row 1 replace into t1 values (126,"first updated"); replace into t1 values (63,default); select * from t1; a b 126 first updated 63 default_value 127 last drop table t1; CREATE TABLE t1 (f1 INT); CREATE VIEW v1 AS SELECT f1 FROM t1 WHERE f1 = 0 WITH CHECK OPTION; REPLACE INTO v1 (f1) VALUES (1); ERROR 44000: CHECK OPTION failed `test`.`v1` DROP TABLE t1; DROP VIEW v1;