WordPress database error: [Can't create/write to file '/tmp/MYDeTt4D' (Errcode: 30 - Read-only file system)]
SELECT DISTINCT t.term_id
FROM wp_terms AS t LEFT JOIN wp_termmeta ON ( t.term_id = wp_termmeta.term_id AND wp_termmeta.meta_key='order') INNER JOIN wp_term_taxonomy AS tt ON t.term_id = tt.term_id
WHERE tt.taxonomy IN ('product_cat') AND (
( wp_termmeta.meta_key = 'order' OR wp_termmeta.meta_key IS NULL )
)
ORDER BY wp_termmeta.meta_value+0 ASC, t.name ASC
