sql - Swapping column values in Oracle -


I was solving one of the puzzles and using switched column values, using DML questions: 

  from SEEM + TEMP_TABLE; ID 1, ID 2 -------- 20, 15 20, 15 20, 15   
 The solution is mathematical calculation:  
  update Templable set ID1 = ID1 + ID2; Update temp set ID2 = ID1-ID2; Update templates SET ID1 = ID1-ID2;   
 Now, I am trying to figure out whether it can be applied to strings or not, please suggest.  
  SELECT * to TEMP_TABLE_NEW; ID 1, ID2 -------- ABC, XYZ ABC, XYZ ABC, XYZ    
 
 
 There is no need to have three update statements; one is enough:  
  UPDATE temp_table_new SET id1 = id2, id2 = id1;

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