UNION ALL订购最终结果

我有以下正在成功生成结果的查询。然而，结果是连续的，我想通过所谓的clicksUNION ALL订购最终结果

(SELECT women_id, title, body FROM women ORDER BY women_id DESC LIMIT 5) 
UNION ALL 
(SELECT man_id, title, body FROM man ORDER BY man_id DESC LIMIT 5)

现在两个表中一列责令其给出的结果是这样的：

women 41124 
women 124 
women 12 
women 2 
women 1 
men 3455434 
men 1233 
men 135 
men 23 
men 1

我需要它给像最终结果这样的：

men 3455434 
women 41124 
men 1233 
men 135 
women 124 
men 23 
women 12 
women 2 
women 1 
men 1

来源

2013-06-11 Amy Neville

您需要在clicks到UNION -ed数据集带来，加ORDER BY，然后投影不必要柱而出另一个SELECT，就像这样：

SELECT person_id, title, body FROM ((
    (SELECT women_id as person_id, title, body, clicks FROM women ORDER BY women_id DESC LIMIT 5) 
UNION ALL 
    (SELECT man_id as person_id, title, body, clicks FROM man ORDER BY man_id DESC LIMIT 5) 
) ORDER BY clicks DESC) data

来源

2013-06-11 17:17:38 dasblinkenlight

我要提出这个建议。看起来有4或5个人有同样的想法 - 这是唯一一个添加到'点击'列并通过 –

为什么添加子查询的订单？ – Ochi

@Ochi推出''clicks'列，哪个OP不希望在输出中看到。 – dasblinkenlight

(
    (SELECT women_id, title, body, clicks FROM women ORDER BY women_id DESC LIMIT 5) 
    UNION ALL 
    (SELECT man_id, title, body, clicks FROM man ORDER BY man_id DESC LIMIT 5) 
) 
ORDER BY clicks DESC

只是在末尾添加顺序和完成工作

来源

2013-06-11 17:17:10 Ochi

点击仍然不是有效的列内联盟 –

他说有这样一列 – Ochi

你现在已经添加它 - 在发布时，你没有将它包含在UNIONs –

SELECT * FROM 
(
    (SELECT women_id AS ID, title, body FROM women LIMIT 5) 
    UNION ALL 
    (SELECT man_id AS ID, title, body FROM man LIMIT 5) 
) 
ORDER BY ID DESC

来源

2013-06-11 17:18:03 StilesCrisis

这个看起来可能适合，但它说“每个派生表都必须有自己的别名”作为错误 –

UNION ALL订购最终结果

回答

相关问题