Mysql 如何从两个查询中只返回一个查询结果
我目前的sql查询如下。我尝试了一些联合查询,但都不起作用Mysql 如何从两个查询中只返回一个查询结果,mysql,sql,database,Mysql,Sql,Database,我目前的sql查询如下。我尝试了一些联合查询,但都不起作用 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_key
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%"`
两个查询都可能返回许多行。我想像这样返回文件路径和对象uid -图像| id |对象| uid |对象| utitle -img1 | obj1 |标题1 -img2 | obj2 |标题2 -img2 | obj2 |标题3 有办法吗
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,根据您希望显示的内容添加ORDER BY DESC/ASC
。尝试以下操作:
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) )
你可以加入表格
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%"
使用多个内部联接,您应该尝试以下操作:
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%"
两个查询都返回了多少行?是否总是每个都有一条?您是在寻找一条包含每个记录中的数据的记录还是单独的记录?对不起,我的英语很差。两个查询都可能返回许多行。但我想像这样回来。图像| id | Object | uid | Object | utitle img1 | obj1 | Title 1 img2 | obj2 | Title 2 img2 | obj2 | Title 3两个查询返回的行可能很多。我想像这样返回文件路径和对象uid-图像| id | Object | uid | Object | utitle-img1 | obj1 | Title 1-img2 | obj2 | Title 2-img2 | obj2 | Title 3有什么方法可以做到这一点吗?如果要返回的条目超过1个,那么不要设置限制,而是创建一个循环来打印出所有需要的信息