3
有沒有辦法從MySQL的虛擬DUAL表中加入字段?MySQL雙表加入雙表
說我有一個
SELECT 1 as n1 FROM DUAL
n1
--
1
和
SELECT 2 as n2 FROM DUAL
n2
--
2
我能加入一個都選擇加入某種查詢爲...
SELECT 1 as n1 FROM DUAL JOIN (SELECT 2 as n2 FROM DUAL) ON 1=1
?
你想要結果看起來像什麼? MySQL允許你完全省略'FROM'子句,所以你甚至不需要'FROM Dual'。 –
將它們設置爲子選擇並別名表然後加入。 – xQbert
根據你的意圖,它可能就像'SELECT 1 AS n1,2 AS n2' –