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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; 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. 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 23000: Duplicate entry '127' for key 'PRIMARY' replace into t1 values (0,"error"); ERROR 23000: Duplicate entry '127' for key 'PRIMARY' 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; SET sql_mode = default; 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 HY000: CHECK OPTION failed 'test.v1' DROP TABLE t1; DROP VIEW v1;