How to do sum when using union

hi,
i am getting following example data from a query
which uses UNION which is mandatory.
is there a way to do sum of Units column to get a single
row ?
hire date units
01.08.2003 1,00
01.08.2003 12,50
like to see as a single row
01.08.2003 13,50
rgds,
Karna

SELECT hire_date, SUM(units) units
FROM (SELECT hire_date, units
      FROM table1
      UNION ALL
      SELECT hire_date, units
      FROM table2)
GROUP BY hire_dateTTFN
John

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Code:
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Pixel Clock 74.25 Mhz, Interlaced
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Sync width: 44 pixels       10 lines
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Copyright Fedward. All rights reserved, all wrongs reversed.

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