PL/SQL語句塊提高1+case語句

 serveroutput  

v_a :v_b 
v_id stud.idnm stud.namenm
 debug connect session  debug   
accept abc prompt 

age:
,

 (),(id)  v_count,v_avg v_count  
  (() (sex (,  stud1 (,,,  stud1 (,,,  stud1 (,,,
   id,name,age,( sex     sex 
 id,name,age,(  sex    sex 
 id,name,age,(  sex   sex  
) sex 
(
 sex  v_result  stud1  id
    
    
  
 v_id;