woocommerce offtopic – Unknown column ” in ‘where clause’ when trying to search for related products on admin page

I am trying to search for related products within the admin page of a product. No results are shown and i get the following error in my nginx error log.

I am using mysql 8 / php 7.4-fpm and the current version of WordPress (5.6) and WooCommerce (4.8.0).

Any ideas? :/

enter image description here

2021/01/08 12:05:20 (error) 13624#13624: *256901 FastCGI sent in stderr: "PHP message: WordPress-Datenbank-Fehler Unknown column '' in 'where clause' für Abfrage SELECT DISTINCT posts.ID as product_id, posts.post_parent as parent_id FROM qgwp_posts posts
             LEFT JOIN qgwp_wc_product_meta_lookup wc_product_meta_lookup ON posts.ID = wc_product_meta_lookup.product_id
              LEFT JOIN qgwp_wc_product_meta_lookup parent_wc_product_meta_lookup
             ON posts.post_type = 'product_variation' AND parent_wc_product_meta_lookup.product_id = posts.post_parent 
            WHERE posts.post_type IN ('product','product_variation')
             AND (  ( ( posts.post_title LIKE '%333%') OR ( posts.post_excerpt LIKE '%333%') OR ( posts.post_content LIKE '%333%' ) OR ( wc_product_meta_lookup.sku LIKE '%333%' )  OR ( wc_product_meta_lookup.sku = "" AND parent_wc_product_meta_lookup.sku LIKE '%333%' ) ))  AND posts.ID NOT IN(9781) 
             AND posts.post_status IN ('private','publish') 
            
            ORDER BY posts.post_parent ASC, posts.post_title ASC
             LIMIT 30 
             von do_action('wp_ajax_woocommerce_json_search_prod" while reading response header from upstream

transactions – Can two related “spends” be in the same block?

Consider the case where:

  • Address A has some BTC.
  • Address B is empty/zero.
  • Address C is the intended recipient.

B sending to C is invalid on its own, but does make sense if associated with A sending to B first

Can two dependent transactions be put into the same block and accepted?

(Since the net result will be OK, even though the second transaction does not make sense until the first one is completed)

customization – FireFox Inspector :: find CSS file related to

I’m creating my new website and I would like to change the background colour. Through FireFox Inspector I nailed the CSS line that manages the colour, it’s background-color: #fff;

enter image description here

I now have to change that #fff to #f3f3f3 but I cannot find the right .css file. The .css files are 4:

  • block-editor-style.css
  • editor-style.css
  • theme-help.css
  • customizer-style.css

enter image description here

Inside those files I find several background-color: #fff; but none manages that header background.

Any idea what .css file manages the header background?

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real analysis – one summation and related asymptotic of not well known series

I have a summation for one of my research as follows:

sum of gathered bucket $B= frac{1}{2} * 1 + frac{1}{4} * 2 + frac{1}{8} * 3 + … + frac{1}{2^{n-2}} * (n-2) + frac{1}{2^{n-1}} * (n-1) + frac{1}{2^{n-1}} * (n-1) $

I need an asymptotic notation for $B$. How I can summarize this sum to
find $O$ equivalency class or big-o notation.