EXECUTE IMMEDIATE _ Oracle example

set serveroutput on;
DECLARE
   v_table_name varchar(100):='abc';
   sql_stmt varchar(255):='default';
   cnt NUMBER:=0;
   cursor tbl is select table_name from  TBP_tables_tmp;
BEGIN
  update  TBP_tables_tmp  set cnt=0; 
  FOR reg IN tbl  LOOP
        --dbms_output.put_line ( reg.table_name );
    v_table_name :=reg.table_name;
    sql_stmt :=  'update  TBP_tables_tmp '
                  || ' set cnt=( ' 
                  || 'select count(transaction_status)  from '
                  ||v_table_name 
                  ||' where transaction_status=''PUB'''
                  || ') where table_name=''' 
                  || v_table_name || ''''; 
     DBMS_OUTPUT.put_line (sql_stmt);
     
     EXECUTE IMMEDIATE sql_stmt  ;
  end loop;
  
  select table_name into v_table_name from   TBP_tables_tmp where cnt>0; 

sql_stmt :='update ' ||v_table_name || ' set TRANSACTION_STATUS=''NEW'' where TRANSACTION_STATUS=''PUB''';
DBMS_OUTPUT.put_line (sql_stmt);
 EXECUTE IMMEDIATE sql_stmt  ;
   
END;
/

 

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create table TBP_tables_tmp (table_name varchar2(50), cnt number);