仅获取多个字段的整体汇总 WITH ROLLUP 和 GROUP BY

Question

执行WITH ROLLUP多字段分组时，MySQL 会为每个组返回一个汇总行，以及总体摘要：

CREATE TABLE test (name VARCHAR(50), number TINYINT);
INSERT INTO test VALUES
    ('foo', 1), ('foo', 1), ('foo', 2), ('foo', 3), ('foo', 3),
    ('bar', 1), ('bar', 2), ('bar', 2), ('bar', 2), ('bar', 3),
    ('baz', 1), ('baz', 2), ('bar', 2);
SELECT name, number, COUNT(1) FROM test GROUP BY name, number WITH ROLLUP;

+------+--------+----------+
| name | number | count(1) |
+------+--------+----------+
| bar  |      1 |        1 |
| bar  |      2 |        3 |
| bar  |      3 |        1 |
| bar  |   NULL |        5 |
| baz  |      1 |        1 |
| baz  |      2 |        2 |
| baz  |   NULL |        3 |
| foo  |      1 |        2 |
| foo  |      2 |        1 |
| foo  |      3 |        2 |
| foo  |   NULL |        5 |
| NULL |   NULL |       13 |
+------+--------+----------+

我对 foo/bar/baz 的汇总并不感兴趣，只关心总体摘要。实现这一目标的最有效方法是什么？

Answer 1

SELECT * FROM
(
    SELECT name, number, COUNT(1) `count` FROM test
    GROUP BY name, number WITH ROLLUP
) A WHERE (ISNULL(name) + ISNULL(number)) <> 1;

或者

SELECT * FROM
(
    SELECT name, number, COUNT(1) `count` FROM test
    GROUP BY name, number WITH ROLLUP
) A WHERE ISNULL(name) = ISNULL(number);