在MySQL中的聯合查詢

Question

我有這兩個查詢。

select * from blog_post where isDelete=0 
      and pOrder !=0 order by pOrder asc 
select * from blog_post where isDelete=0 
      and pOrder=0 order by postID desc 

這工作正常。

但是當我嘗試加入這個兩個查詢到union，

select * from 
    ((select * from blog_post 
       where isDelete=0 and pOrder !=0 
       order by pOrder asc) 
     union all 
    (select * from blog_post 
       where isDelete=0 and pOrder=0 
       order by postID desc)) as tbl1 

它給第二個查詢的升序輸出，但在查詢它是按降序排列。

Answer 1

您可以嘗試如下。

(select * from blog_post where isDelete=0 and pOrder !=0 order by pOrder asc) 
UNION 
(select * from blog_post where isDelete=0 and pOrder=0 order by postID desc) 

Answer 2

嘗試這樣

select * from(select col1,col2,...colN,'1' as sorting from blog_post where isDelete=0 and pOrder !=0 order by pOrder asc UNION All select col1,col2,...colN,'1' as sorting from blog_post where isDelete=0 and pOrder=0 order by postID desc) temp order by sorting asc,if (sorting=1,pOrder,0) asc,if (sorting=2,postID,0) desc 

Answer 3

你可以試試這個：

select * from blog_post where isDelete=0 and pOrder != 0 
UNION ALL 
select * from blog_post where isDelete=0 and pOrder = 0 
order by pOrder,postID 

Answer 4

我通過以下解決了這個查詢。

SELECT * FROM blog_post其中isDelete = 0 ORDER BY（案例pOrder那麼當0（選擇馬克斯（pOrder）+ 1從blog_post）其他pOrder完）遞增，帖子ID遞減

感謝對這個問題的評論，我只是在努力，上面的查詢給了我完美的我想要的。