How to replace output of SELECT statemnt in Mysql?

Question

I have a query

SELECT id, descr Category, parent_id `Department`, updated `Updated`
     , updatedby `By`
FROM category

which returns numbers at the column parent_id. It can only return one of three number (167, 154, 164) at parent_id column. I want to replace those numbers with:

164 - Advertisemnt
167 - Modeling
154 - Finance 

How can that be achieved? so , the table should look like:

id category Department Updated By

1  Network  Modeling   now()   Me

Answer 1

Use as CASE statement like this:

SELECT id
      ,descr AS `Category`
      ,CASE parent_id 
         WHEN 164 THEN 'Advertisemnt'
         WHEN 167 THEN 'Modeling'
         WHEN 154 THEN 'Finance'
         ELSE          'Unknown partent_id'
       END AS `Department`
     ,updated AS `Updated`
     ,updatedby AS `By`
FROM  category