The first query gets all custom publication posts that have a value in field book_seq ordered by book_seq The second query gets all custom publication posts that have no meta value for book_seq or no meta record for key book_seq ordered by post_title.
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$querytop=get_posts(array(
'post_type'=>'publication',
'numberposts'=>-1,
'orderby'=>'meta_value',
'meta_key'=>'book_seq',
'order'=>'ASC',
'meta_query'=>array(
// meta query takes an array of arrays, watch out for this!
array(
'key'=>'book_seq',
'value'=>array('','NULL'),
'compare'=>'NOT IN'
)
)
));
$querybottom=get_posts(array(
'post_type'=>'publication',
'numberposts'=>-1,
'orderby'=>'post_title',
'order'=>'ASC',
'meta_query'=>array(
// meta query takes an array of arrays, watch out for this!
'relation'=>'OR',
array(
'key'=>'book_seq',
'compare'=>'NOT EXISTS'
),
array(
'key'=>'book_seq',
'value'=>array('','NULL'),
'compare'=>'IN'
)
)
));
$store_query=array_merge($querytop,$querybottom);
Great article here: https://rudrastyh.com/wordpress/meta_query.html
erics, July 14th, 2021 
Categories: How-To's, Technology Capture, Command, Command Output, howto, Keep, line break, Line Breaks, Preserve, Store, Storing, tips, Variable
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