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运算符：数学运算符

mysql> select class,number,maths,maths+5 from score;

mysql>select class,number,chinese+maths+english from score;

mysql> select *,maths+chinese+english as total from score;

mysql> select *,maths+chinese+english as total from score order by total desc;

mysql> select class*2,number,maths+chinese+english as total from score order by total desc;

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