如何从两个查询中只返回一个查询结果

Question

我现在拥有的sql查询如下。我尝试了一些联合查询，但他们没有工作。

Select file_path 
from images 
where image_id In (
    Select image_id 
    from temp_images 
    where object_uid IN (
    Select object_uid 
    from object_table 
    where object_status = 2 and object_place like "%some_keyword%"))` 


Select object_uid, object_utitle 
from object_table 
where object_status = 2 and object_place like "%some_keyword%"` 

这两个查询可能会返回很多行。我想这样返回file_path和object_uid。

-Image_id | Object_uid | Object_utitle

-img1 | obj1 |标题1

-img2 | obj2 |标题2

-img2 | obj2 |标题3

有没有办法做到这一点？

Answer 1

试试这个：

Select a.file_path, b.object_uid, b.object_utitle 
from images a, (Select object_uid, object_utitle 
    from object_table 
    where object_status = 2 and object_place like "%some_keyword%") b 
where image_id In (
    Select image_id 
    from temp_images 
    where object_uid IN (b.object_uid)) 

Answer 2

Select object_uid, object_utitle from object_table where object_status = 2 and object_place like "%some_keyword%" LIMIT 0,1 

它将只选择一个条目，根据您要显示的内容添加ORDER BY DESC/ASC。

Answer 3

您只需连接表。

Select i.Image_id , i.file_path , o.object_uid 
    FROM images i 
    INNER JOIN temp_images t ON t.image_id = i.image_id 
    INNER JOIN object_table o ON o.object_uid = t.object_uid 
    WHERE object_status = 2 and object_place like "%some_keyword%" 

Answer 4

使用多个内部连接，你应该尝试类似的东西：

SELECT imgs.image_id, obj.object_uid, obj.object_utitle 
    FROM images AS imgs 
INNER JOIN temp_images AS tmp_imgs 
    ON tmp_imgs.image_id = imgs.image_id 
INNER JOIN object_table AS obj 
    ON tmp_imgs.object_uid = obj.object_uid 
WHERE obj.object_status = 2 
    AND obj.object_place LIKE "%some_keyword%"