The difference between the case when in Mysql and the funnel mode of case when in HIVE

	'''
		 ,CASE    WHEN social_credit_code IS NOT NULL THEN '10-统一社会信用代码'
	                 WHEN organization_structure_code IS NOT NULL THEN '20-组织机构代码'
	                 WHEN business_license IS NOT NULL THEN '30-工商注册号'  
	         END AS enterprise_main_identification_type    -- '企业主要身份识别类型'
	         
	         
	         
	         
	        ,CASE    WHEN social_credit_code IS NOT NULL THEN social_credit_code
	                 WHEN organization_structure_code IS NOT NULL THEN organization_structure_code
	                 WHEN business_license IS NOT NULL THEN business_license   
	         END AS corporate_identity_number    --  '企业身份标识号码'
	
	'''  

• The case in mysql is a funnel model. When the A condition is met and the B condition is also met, the case in the B condition is used.
  When A is met, B will not be judged.

• This is a small detail that I have to pay attention to. Sometimes it is quite disgusting. .