MySQL排序计算

MySQL排序计算

是的，这是可行的，而且确实可行。查看以下测试：

CREATE TABLE a(a INT, b INT);INSERT INTO a VALUES (1, 1);INSERT INTO a VALUES (1, 2);INSERT INTO a VALUES (1, 3);INSERT INTO a VALUES (1, 4);INSERT INTO a VALUES (1, 5);INSERT INTO a VALUES (1, 6);INSERT INTO a VALUES (2, 1);INSERT INTO a VALUES (2, 2);INSERT INTO a VALUES (2, 3);INSERT INTO a VALUES (2, 4);INSERT INTO a VALUES (2, 5);INSERT INTO a VALUES (2, 6);SELECt a.a, a.b, (a/b) FROM a ORDER BY (a/b);+------+------+--------+| a    | b    | (a/b)  |+------+------+--------+|    1 |    6 | 0.1667 | |    1 |    5 | 0.2000 | |    1 |    4 | 0.2500 | |    2 |    6 | 0.3333 | |    1 |    3 | 0.3333 | |    2 |    5 | 0.4000 | |    1 |    2 | 0.5000 | |    2 |    4 | 0.5000 | |    2 |    3 | 0.6667 | |    2 |    2 | 1.0000 | |    1 |    1 | 1.0000 | |    2 |    1 | 2.0000 | +------+------+--------+

SELECt a.a, a.b FROM a ORDER BY (a/b);

将返回相同的结果。