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SQL Server FAQ - Performing Comparison on Floating Point Numbers

By: FYIcenter.com

(Continued from previous topic...)

How To Perform Comparison on Floating Point Numbers?

Comparison operations on approximate (floating point) numbers are also easy to understand. Just watch out rounding operations performed during conversions. Here are two examples of floating point number comparisons:

-- Rounding during implicit conversion makes them equal
DECLARE @x FLOAT(24), @y FLOAT(24);
SET @x = 0.999999999E+00;
SET @y = 0.99999999E+00;
SELECT CASE WHEN @x <> @y THEN 'True' ELSE 'False' END;
GO
False

-- Floating point number literals have double precision
-- So no rounding
SELECT CASE WHEN 0.999999999E+00 <> 0.99999999E+00 THEN
      'True'
   ELSE
      'False'
   END;
GO
True

(Continued on next topic...)

  1. What Is a Boolean Value?
  2. What Are Conditional Expressions?
  3. What Are Comparison Operations?
  4. How To Perform Comparison on Exact Numbers?
  5. How To Perform Comparison on Floating Point Numbers?
  6. How To Perform Comparison on Date and Time Values?
  7. How To Perform Comparison on Character Strings?
  8. What To Test Value Ranges with the BETWEEN Operator?
  9. What To Test Value Lists with the IN Operator?
  10. What To Perform Pattern Match with the LIKE Operator?
  11. How To Use Wildcard Characters in LIKE Operations?
  12. How To Test Subquery Results with the EXISTS Operator?
  13. How To Test Values Returned by a Subquery with the IN Operator?
  14. What Are Logical/Boolean Operations?

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