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Database

Grant permissions

replace *.* with schema.table if needed

GRANT ALL PRIVILEGES ON *.* TO 'username'@'localhost';

SELECT 
  a.*
FROM 
  map_ads_categories m
  JOIN ads a ON (m.ad_id = a.id)
WHERE
  m.category_id = 28;

SELECT 
  *
FROM 
  map_ads_categories m
  JOIN ads a ON (m.ad_id = a.id)
  JOIN categories c ON (m.category_id = c.id)
WHERE
  c.id = 28;