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SQL Server FAQ - Performing Comparison on Date and Time Values

By: FYIcenter.com

(Continued from previous topic...)

How To Perform Comparison on Date and Time Values?

Comparison operations on date and time values can be performed in the same way as numeric values. The comparison rule is simple: a date and time value in the future has a greater value than a date and time value in the past. The tutorial exercise below shows you a good example:

-- Future date has a greater value
DECLARE @his_birth_date DATETIME, @her_birth_date DATETIME;
SET @his_birth_date = '1987-05-19'; 
SET @her_birth_date = '1988-07-07'; 
SELECT CASE WHEN @his_birth_date < @her_birth_date THEN 
      'He is older.' 
   ELSE 
      'She is older.' 
   END;
GO
He is older.

(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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