I want to merge two equal column names (meta_value) with different values into a one row result instead of two.
SELECT t1.ID, t1.post_content AS product, t2.meta_value AS price
FROM wp_posts AS t1
INNER JOIN wp_postmeta AS t2 ON ( t1.id = t2.post_id )
WHERE t1.post_type = 'product'
LIMIT 0 , 30
Results in
ID product price
1973 product1 12.35
1973 product1 12.10
And I want it to look like this
ID product price sell
1973 product1 12.35 12.10
The meta_key for price is _price and the meta_key for sell is _sell
It looks like you can use an aggregate function with a case statement to transform the data
SELECT t1.ID,
t1.post_content AS product,
max(case when meta_key = '_price' then t2.meta_value end) AS price,
max(case when meta_key = '_sell' then t2.meta_value end) AS sell
FROM wp_posts AS t1
INNER JOIN wp_postmeta AS t2 ON ( t1.id = t2.post_id )
WHERE t1.post_type = 'product'
GROUP BY t1.ID, t1.post_content
LIMIT 0 , 30
But it is not exactly clear based on your table structure, so you might also be able to use:
SELECT t1.ID,
t1.post_content AS product,
max(t2.meta_value) AS price,
min(t2.meta_value) AS sell
FROM wp_posts AS t1
INNER JOIN wp_postmeta AS t2 ON ( t1.id = t2.post_id )
WHERE t1.post_type = 'product'
GROUP BY t1.ID, t1.post_content
LIMIT 0 , 30
SELECT
t1.ID,
t1.post_content AS product,
max(case when t2.meta_key='_price' then t2.meta_value end) AS price,
max(case when t2.meta_key='_sell' then t2.meta_value end) AS sell
FROM wp_posts AS t1
INNER JOIN wp_postmeta AS t2 ON ( t1.id = t2.post_id )
WHERE t1.post_type = 'product'
GROUP BY t1.ID, t1.post_content
LIMIT 0 , 30
Hope this helps you,
SELECT t1.ID, t1.post_content AS product,max(t2.meta_value) as price,min(t2.meta_value) as sell
FROM wp_posts AS t1
INNER JOIN wp_postmeta AS t2 ON ( t1.id = t2.post_id )
WHERE t1.post_type = 'product'
LIMIT 0 , 30
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