UNION ALL不選擇更3列

Question

每一個

我婉通過UNION ALL在PHP

選擇從兩個表8列當我選擇3列，它的工作原理 但是當我的工作選擇4個或更多（像5,6,7,8），它不選擇3

SELECT ID , NULL AS Title , Who 
FROM life 
UNION ALL 
SELECT ID , Title , NULL AS Who 
FROM content 

我的查詢工作

我的查詢中選擇更

SELECT ID , NULL AS Title , Who , MainImage , SubImage , NULL AS Place , ENDate , NULL AS Date 
FROM life 
UNION ALL 
SELECT ID , Title , NULL AS Who , MainImage , SubImage , Place , ENDate , Date 
From content 
ORDER BY ENDate DESC 

我嘗試這些但不是有效的

SELECT life.ID , NULL AS Title , life.Who 
FROM life 
UNION ALL 
SELECT content.ID , content.Title , NULL AS Who 
FROM content 

這

SELECT life.ID , NULL AS Title , life.Who , life.MainImage , life.SubImage , NULL AS Place , life.ENDate , NULL AS Date 
FROM life 
UNION ALL 
SELECT content.ID , content.Title , NULL AS Who , content.MainImage , content.SubImage , content.Place , content.ENDate , content.Date 
From content 
ORDER BY ENDate DESC 

Answer 1

Date是SQL保留關鍵字。你應該使用反勾號字符（`）。

對於後面的勾號，請參考https://superuser.com/questions/254076/how-do-i-type-the-tick-and-backtick-characters-on-windows