Select data from MySQL table of sterilise value with condition

Where  school-id != 84

SELECT COUNT(*) FROM wp_ntt_contact_form_addon WHERE form_value NOT LIKE '%\"school-id\";s:2:\"84\"%'

Where  school-id = 214

SELECT COUNT(*) FROM wp_ntt_contact_form_addon WHERE form_value LIKE '%\"school-id\";s:2:\"214\"%'