DECODE
Create descriptive versions of field data.
DECODE ( <field_name>, <val1>, <result1>, <val2>, <result2>, ... )
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Field_Name - the name of the source to be used.
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Val - the value to be substituted.
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Result - the descriptive value to be applied.
Values that are not matched will decode to Null.
Example: create a field on the Individual table that returns descriptive values for the Gender field.
DECODE ( [Individual].[Gender], 'M', 'Male', 'F', 'Female', 'U', 'Prefer not to Say')