Two PLSQL statements with begin and end, run fine separately but not together?

Question

Just wondering if anyone can help with this, I have two PLSQL statements for altering tables (adding extra fields) and they are as follows:

-- Make GC_NAB fi         


        

Answer 1

one can achieve in two ways

1) run the two blocks separately in pl/sql file.

2) in main block you can run two sbu-blocks in this way :

begin  // main block
      begin 
       .....   [pl/sql commands]
       ......
      end
      begin   
      .......  [pl/sql commands]
      .......
      end
end // main ends