我需要帮助加入两个查询才能得到一张表

Question

Hello I need help joining two queries I'm using to get the result in one query instead of two different

The first query is:

SELECT p.ID as product_id, p.post_title,
       max( CASE WHEN pm.meta_key = 'product_gender' and p.ID = pm.post_id THEN pm.meta_value END ) as gender, 
       max( CASE WHEN pm.meta_key = '_price' and p.ID = pm.post_id THEN pm.meta_value END ) as price, 
       max( CASE WHEN pm.meta_key = 'product_color' and p.ID = pm.post_id THEN pm.meta_value END ) as color, 
       max( CASE WHEN pm.meta_key = 'product_category' and p.ID = pm.post_id THEN pm.meta_value END ) as category,
       max( CASE WHEN pm.meta_key = 'product_size' and p.ID = pm.post_id THEN pm.meta_value END ) as size
FROM    
  wp_posts p 
  join wp_postmeta pm on p.ID = pm.post_id 
group by 
  p.ID 

The second one is:

SELECT parentmeta.post_id as post_id,
 concat((select option_value from wp_options where option_name ='siteurl'  limit 1),'/wp-content/uploads/',childmeta.meta_value)                           as url
 FROM wp_postmeta childmeta 
 INNER JOIN wp_postmeta parentmeta ON (childmeta.post_id=parentmeta.meta_value)
 WHERE parentmeta.meta_key='_thumbnail_id' and childmeta.meta_key = '_wp_attached_file'
 AND parentmeta.post_id = p.ID  //I want to used the same ID as the previous query

Now both tables give me this result

First query:

product_id  post_title   gender    price   color   category   size
83          Puma-Tshirt  Man       19      RED     Tshirt     Medium
86          Nike-Pants   Man       49      BLACK   Pants      Medium

Second query:

product_id   url
83           www.img.com/puma.jpg
86           www.img.com/nike.jpg

What I want is to combine the queries to get something like:

product_id  post_title   gender    price   color   category   size   url
83          Puma-Tshirt  Man       19      RED     Tshirt     Medium www.img.com/puma.jpg
86          Nike-Pants   Man       49      BLACK   Pants      Medium www.img.com/nike.jpg

All help is very much appreciated, thanks.

Answer 1

( SELECT p.ID as product_id, p.post_title,
       max( CASE WHEN pm.meta_key = 'product_gender' and p.ID = pm.post_id THEN pm.meta_value END ) as gender, 
       max( CASE WHEN pm.meta_key = '_price' and p.ID = pm.post_id THEN pm.meta_value END ) as price, 
       max( CASE WHEN pm.meta_key = 'product_color' and p.ID = pm.post_id THEN pm.meta_value END ) as color, 
       max( CASE WHEN pm.meta_key = 'product_category' and p.ID = pm.post_id THEN pm.meta_value END ) as category,
       max( CASE WHEN pm.meta_key = 'product_size' and p.ID = pm.post_id THEN pm.meta_value END ) as size
FROM    
  wp_posts p 
  join wp_postmeta pm on p.ID = pm.post_id 
group by 
  p.ID )   
UNION   
(SELECT parentmeta.post_id as post_id,
 concat((select option_value from wp_options where option_name ='siteurl'  limit 1),'/wp-content/uploads/',childmeta.meta_value)                           as url
 FROM wp_postmeta childmeta 
 INNER JOIN wp_postmeta parentmeta ON (childmeta.post_id=parentmeta.meta_value)
 WHERE parentmeta.meta_key='_thumbnail_id' and childmeta.meta_key = '_wp_attached_file'
 AND parentmeta.post_id = p.ID  //I want to used the same ID as the previous query)

This will give you the required result.
From your question it is like you just want combination of this two irrespective of their joins and all.

Answer 2

You could join the two query

select t1.*, t2.* 
from  (
  SELECT p.ID as product_id, p.post_title,
         max( CASE WHEN pm.meta_key = 'product_gender' and p.ID = pm.post_id THEN pm.meta_value END ) as gender, 
         max( CASE WHEN pm.meta_key = '_price' and p.ID = pm.post_id THEN pm.meta_value END ) as price, 
         max( CASE WHEN pm.meta_key = 'product_color' and p.ID = pm.post_id THEN pm.meta_value END ) as color, 
         max( CASE WHEN pm.meta_key = 'product_category' and p.ID = pm.post_id THEN pm.meta_value END ) as category,
         max( CASE WHEN pm.meta_key = 'product_size' and p.ID = pm.post_id THEN pm.meta_value END ) as size
  FROM wp_posts p 
  join wp_postmeta pm on p.ID = pm.post_id 
  group by  p.ID 
) t1 
inner join  (
  SELECT parentmeta.post_id as post_id,
   concat((select option_value from wp_options where option_name ='siteurl'  limit 1),'/wp-content/uploads/',childmeta.meta_value)                           as url
   FROM wp_postmeta childmeta 
   INNER JOIN wp_postmeta parentmeta ON (childmeta.post_id=parentmeta.meta_value)
   WHERE parentmeta.meta_key='_thumbnail_id' and childmeta.meta_key = '_wp_attached_file'
) t2 on t1.product_id = t2.post_id 

Answer 3

Query structure will be-

SELECT 
A.*,B.Url
FROM
(
    --Your First Query
)A
INNER JOIN 
(
    --Your Second Query
)B
ON A.Product_id = B.Product_id

Note: Use LEFT JOIN if possibilities are there to have less records in Query 2 compare to Query 1.