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drop table if exists t1; set sql_mode="MySQL40"; Warnings: Warning 3090 Changing sql mode 'NO_AUTO_CREATE_USER' is deprecated. It will be removed in a future release. Warning 3090 Changing sql mode 'MYSQL40' is deprecated. It will be removed in a future release. select @@sql_mode; @@sql_mode MYSQL40,HIGH_NOT_PRECEDENCE set @@sql_mode="ANSI"; select @@sql_mode; @@sql_mode REAL_AS_FLOAT,PIPES_AS_CONCAT,ANSI_QUOTES,IGNORE_SPACE,ONLY_FULL_GROUP_BY,ANSI SELECT 'A' || 'B'; 'A' || 'B' AB CREATE TABLE t1 (id INT, id2 int); SELECT id,NULL,1,1.1,'a' FROM t1 GROUP BY id; id NULL 1 1.1 a SELECT id FROM t1 GROUP BY id2; ERROR 42000: Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'test.t1.id' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by drop table t1; SET @@SQL_MODE=""; CREATE TABLE t1 (i int auto_increment NOT NULL, PRIMARY KEY (i)); SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `i` int(11) NOT NULL AUTO_INCREMENT, PRIMARY KEY (`i`) ) ENGINE=ENGINE DEFAULT CHARSET=latin1 SET @@SQL_MODE="MYSQL323"; Warnings: Warning 3090 Changing sql mode 'MYSQL323' is deprecated. It will be removed in a future release. SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `i` int(11) NOT NULL AUTO_INCREMENT, PRIMARY KEY (`i`) ) TYPE=ENGINE SET @@SQL_MODE="MYSQL40"; Warnings: Warning 3090 Changing sql mode 'MYSQL40' is deprecated. It will be removed in a future release. SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `i` int(11) NOT NULL AUTO_INCREMENT, PRIMARY KEY (`i`) ) TYPE=ENGINE SET @@SQL_MODE="NO_FIELD_OPTIONS"; Warnings: Warning 3090 Changing sql mode 'NO_FIELD_OPTIONS' is deprecated. It will be removed in a future release. SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `i` int(11) NOT NULL, PRIMARY KEY (`i`) ) ENGINE=ENGINE DEFAULT CHARSET=latin1 DROP TABLE t1;