Pencil Set #1

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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