我正在尝试选择q1.res
子查询结果的FROM
:
(SELECT SUM(gwr.res1)/(COUNT(*)*1000) as 'res'
FROM process.gwr
WHERE started = 1 AND gwr.user2 = g.id AND gwr.loss = g.id) AS q1
问题是我试图在子查询中选择g.id
但由于某种原因它无法访问它而返回错误消息:
[Err] 1054 - Unknown column 'g.id' in 'where clause'
没有任何意义,因为g.id(grand.id
有id
列)
SELECT
g.name, g.point, g.mx, q1.res
FROM
(SELECT SUM(gwr.res1)/(COUNT(*)*1000) as 'res'
FROM process.gwr
WHERE (started = 1) AND (gwr.user2 = g.id) AND (gwr.loss = g.id)) AS q1, grand g
LEFT JOIN process.users p ON (p.id = g.owner)
WHERE
p.name != ""
ORDER BY
g.point DESC,
g.mx DESC
LIMIT 5
问题出在哪里?
答案 0 :(得分:0)
尝试从子查询中删除''来自'res'。
SELECT
g.name, g.point, g.mx, q1.res
FROM
(SELECT SUM(gwr.res1)/(COUNT(*)*1000) as res FROM process.gwr WHERE started = 1 AND gwr.user2 = g.id AND gwr.loss = g.id) AS q1, grand g
LEFT JOIN process.users p ON (p.id = g.owner)
WHERE
p.name != ""
ORDER BY
g.point DESC,
g.mx DESC
LIMIT 5
答案 1 :(得分:0)
您需要提及数据库对象'g'所指的内容。意思是,您需要将“FROM”部分中的表格(或视图)指定为纯交叉引用,或者 - 如果您感觉舒服 - 那么使用某种类型的连接。
e.g
SELECT SUM(gwr.res1)/(COUNT(*)*1000) as 'res'
FROM process.gwr, process.g
WHERE started = 1
AND gwr.user2 = g.id
AND gwr.loss = g.id
注意'FROM'部分中的'process.g'。
希望有所帮助。
K