1select 1 + "2 a"; 21 + "2 a" 33 4Warnings: 5Warning 1292 Truncated incorrect DOUBLE value: '2 a' 6create table t (a int primary key, b blob default ''); 7select a, (2*a) AS a from t group by a; 8a a 9Warnings: 10Warning 1052 Column 'a' in group statement is ambiguous 11drop table t; 12select 1 + "2 a"; 131 + "2 a" 143 15Warnings: 16Warning 1292 Truncated incorrect DOUBLE value: '2 a' 17create table t (a int primary key, b blob default ''); 18select a, (2*a) AS a from t group by a; 19a a 20Warnings: 21Warning 1052 Column 'a' in group statement is ambiguous 22Warning 1052 Column 'a' in group statement is ambiguous 23drop table t; 24select 1 + "2 a"; 251 + "2 a" 263 27Warnings: 28Warning 1292 Truncated incorrect DOUBLE value: '2 a' 29create table t (a int primary key, b blob default ''); 30select a, (2*a) AS a from t group by a; 31a a 32Warnings: 33Warning 1052 Column 'a' in group statement is ambiguous 34drop table t; 35