mysql count 搭配case的使用，一条sql统计多条数据

SELECT 
count(CASE WHEN testresult IS NULL THEN 1  end)'NULL',    
count(CASE WHEN testresult ='FAIL' THEN 1  end)'FAIL',
count(CASE WHEN testresult = 'PASS' THEN 1  end)'PASS'
FROM auto_jdy_uidesc 
WHERE Uitest_id IN 
(SELECT a.id from auto_jdy_taskdesc a WHERE a.taskname ="login")