Question

I have a wordpress database with a number of custom fields/metadata.

---------
wp_postmeta
---------
post_id
meta_key
meta_value

I want to find all the posts with a meta_key of ‘Start Date’ and a value of ‘NOW()’, but not the posts that have the meta_key ‘Ongoing’ and value of ‘Yes’.

I’m a bit confused of how to join the queries:

SELECT * FROM wp_posts, wp_postmeta
WHERE wp_posts.ID = wp_postmeta.post_id
AND wp_postmeta.meta_key = 'Start Date'
AND wp_postmeta.meta_value > NOW()

with

SELECT * FROM wp_posts, wp_postmeta
WHERE wp_posts.ID = wp_postmeta.post_id
AND wp_postmeta.meta_key = 'Ongoing'
AND wp_postmeta.meta_value != 'Yes'

And potentially other queries… I think what is throwing me off is that I can’t add another WHERE clause to the statement? I think I just need a prod in the right direction because I am missing some basic mysql understanding.

Thank you so much in advance!

Answer 1

Try this:

SELECT * FROM wp_posts, wp_postmeta
WHERE wp_posts.ID = wp_postmeta.post_id
AND ((wp_postmeta.meta_key = 'Start Date'
AND wp_postmeta.meta_value > NOW()) OR (wp_postmeta.meta_key = 'Ongoing'
AND wp_postmeta.meta_value != 'Yes'))