database - Check two tables and find values not in both using SQL -

i have 2 tables returning reference code from. need compare both these lists find references exists in tablea or tableb, not in both.

as example, if table , table b had following data

table references 01 02 04  table b references 01 22

i expect return table following

table c references 02 04 22

the sql has me stumped. suggestions?

try this,

  select col1     (       select col1 table_a       union       select col1 table_b     ) x      group col1      having count(*) =1

this query eliminate if value comes twice in same table.

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