SQL 语句优化：统计标签下公司数量并排序

SELECT tll.label_name, COUNT(tc.qymc) FROM t_label_company_match t LEFT JOIN t_company_info tc ON tc.id = t.company_id LEFT JOIN t_label_library tll ON tll.id = t.label_id WHERE tll.label_index_id LIKE '-2%' GROUP BY tll.label_name ORDER BY COUNT(tc.qymc) DESC LIMIT 4