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ERROR #1054 - Columna desconocida 'program_id' en 'NUEVO

CREAR DISPARADOR trig_job_color DESPUÉS DE INSERTAR EN tb_jobs PARA CADA FILA BEGINSET @program_id =(Seleccione program_id de tb_ticketswhere tb_tickets.job_id =NEW.job_id);

SET @newstatus = (Select status from tb_tickets
where tb_tickets.job_id = NEW.job_id);
SET @newsite_id = (Select site_id from tb_tickets
where tb_tickets.job_id = NEW.job_id);

CASE @program_id
 WHEN 1 THEN
   UPDATE tb_sites_3 
   SET tb_sites_3.color_status = @newstatus 
   WHERE tb_sites_3.site_id = @newsite_id;
 WHEN 2 THEN
   UPDATE tb_sites_3 
   SET tb_sites_3.color_status = @newstatus 
   WHERE tb_sites_3.site_id = @newsite_id;
 WHEN 3 THEN
   UPDATE tb_sites_3
   SET tb_sites_3.color_status = @newstatus 
   WHERE tb_sites_3.site_id = @newsite_id;
 END CASE;
 END