2
这是我的数据库中的“评级”表。COUNT从单栏并将其分成2列
attraction customer rate
------------------------------------
attrac1 cust1 like
attrac2 cust1 dislike
attrac1 cust2 like
要我写什么SQL,使输出变成这个样子
attraction like dislike
----------------------------------
attrac1 2 0
attrac2 0 1
我想这
SELECT a_id,
(SELECT COUNT(rate) FROM rating WHERE rate = 'like') as 'Like',
(SELECT COUNT(rate) FROM rating WHERE rate = 'dislike') as 'Dislike'
FROM rating
但我不能得到我想要的结果。
感谢您的快速回复。我从来不知道SQL中可以有一个if else语句。 – Joseph 2012-02-21 09:57:40