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Don Burleson Blog 







Oracle mapping tables

Oracle Database Tips by Donald BurlesonApril 1, 2015

Question: What are Oracle mapping tables?

Answer: Oracle mapping tables are an alternative to using the decode and case statement to transform one value to another. For example, consider this example to transform a gender abbreviation into a gender name:

  decode (

In this case we could use a "mapping table" to contain the gender translation values.

  customer.gender_code = gender_mapping.gender_code;

Note: Mapping tables introduce an unnecessary join and you might be better off storing the full gender codes. Also, it's never a good idea to make a table that contain single column values, a case of over-normalization that causes unnecessary join overhead. Whenever possible resists the temptation to use abbreviated codes in tables. Disk is cheap.



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