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drop table if exists t1;
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: 'test.t1.id' isn't in GROUP BY
drop table t1;
set sql_mode="MySQL40";
select @@sql_mode;
@@sql_mode
NO_FIELD_OPTIONS,MYSQL40
set sql_mode="ANSI";
select @@sql_mode;
@@sql_mode
REAL_AS_FLOAT,PIPES_AS_CONCAT,ANSI_QUOTES,IGNORE_SPACE,ONLY_FULL_GROUP_BY,ANSI
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