WordPress database error: [Got error 'empty (sub)expression' from regexp]
SELECT DISTINCT CONCAT('\'', SUBSTRING(`meta_key`, 2, CHAR_LENGTH(`meta_key`)), '\'') as `meta_key` FROM `wp_postmeta` WHERE `meta_value` REGEXP ''

UrbanData – Timisoara Building Permits 2002 – 2016 – Razvan Zamfira

UrbanData – Timisoara Building Permits 2002 – 2016