UNION ALL訂購最終結果

我有以下正在成功生成結果的查詢。然而，結果是連續的，我想通過所謂的clicksUNION ALL訂購最終結果

(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)

現在兩個表中一列責令其給出的結果是這樣的：

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

我需要它給像最終結果這樣的：

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

來源

2013-06-11 Amy Neville

您需要在clicks到UNION -ed數據集帶來，加ORDER BY，然後投影不必要柱而出另一個SELECT，就像這樣：

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

來源

2013-06-11 17:17:38 dasblinkenlight

我要提出這個建議。看起來有4或5個人有同樣的想法 - 這是唯一一個添加到'點擊'列並通過 –

爲什麼添加子查詢的訂單？ – Ochi

@Ochi推出''clicks'列，哪個OP不希望在輸出中看到。 – 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

只是在末尾添加順序和完成工作

來源

2013-06-11 17:17:10 Ochi

點擊仍然不是有效的列內聯盟 –

他說有這樣一列 – Ochi

你現在已經添加它 - 在發佈時，你沒有將它包含在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

來源

2013-06-11 17:18:03 StilesCrisis

這個看起來可能適合，但它說「每個派生表都必須有自己的別名」作爲錯誤 –

UNION ALL訂購最終結果

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