1
我创建一个视图,例如:SQL计算字段
CREATE VIEW all AS
SELECT m.id, m.title, m.description, m.date, m.views, r.rating, r.id
FROM riv_montage m, riv_ratings r
,但我想对所有做过类似的行创建一个计算字段:
r.rating/COUNT(r.id)
是有没有办法做到这一点?
CREATE VIEW all
AS
SELECT
r.rating, r.id, r.rating/(SELECT COUNT(id) FROM riv_ratings)
FROM
riv_ratings r
你为什么要做交叉连接? – 2010-08-11 15:02:52