Question

我正在尝试从brews和recipes表中获取来自表中的跟随者数量的信息，但是我收到了一个sql错误，因为我返回的不仅仅是一个结果在我的查询中。我应该把它分成两个查询吗？或者是否有解决方法可以让我在我的外b.uid语句中检查多个WHERE

SELECT 
  b.bid AS bid, b.name AS bname, 
  r.name AS recipe, b.status AS status, 
  r.rid, a.f_name, a.l_name, a.pic_loc, a.uid AS uid
FROM 
  recipes r, brews b, account a
WHERE 
  b.uid = (SELECT followed FROM follow 
  WHERE follower = '#cookie.id#') 
  AND b.rid = r.rid AND b.uid = a.uid 
GROUP BY b.bid
ORDER BY b.time DESC

Answer 1

只需使用WHERE b.uid IN (SELECT followed...

即可

Answer 2

要返回多个结果集，您需要使用cfstoredproc，但这不是您的问题。在where子句中将“=”符号更改为IN，或将select更改为连接。您的问题只是一个错误的查询，而不是多个结果集。

SELECT 
    b.bid AS bid, b.name AS bname, r.name AS recipe, 
    b.status AS status, r.rid, a.f_name, a.l_name, 
    a.pic_loc, a.uid AS uid
FROM 
    recipes AS r
    LEFT JOIN brews AS b
        ON b.rid = r.rid
    LEFT JOIN account AS a
        ON b.uid = a.uid
    LEFT JOIN follow AS f
        ON f.followed = b.uid
WHERE f.follower = <cfqueryparam cfsqltype="CF_SQL_VARCHAR" value="#cookie.id#" />
GROUP BY b.bid
ORDER BY b.time DESC

Answer 3

GROUP BY子句可能也会引起您的问题。如果使用聚合函数（SUM（），AVG（），MIN（），MAX（）等等）并且需要对总计的记录进行分组，则查询中只应该有一个GROUP BY子句。进入小组。

SQL Query在Query中返回多个结果

3 个答案: