Mysql - Counting NULL总是返回0？

Question

我试图得到这个结果:

NULL    350
google  98
yahoo   5
bing    4

有了这个查询:

SELECT engine, COUNT(engine) AS count
FROM visits
GROUP BY engine
ORDER BY count DESC

但它返回:

google  98
yahoo   5
bing    4
NULL    0

我怎么解决这个问题？

Answer 1

改用COUNT(1)：

SELECT engine, COUNT(1) AS count
FROM visits
GROUP BY engine
ORDER BY count DESC;

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