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SQL query to combine rows

EXPERT RESPONSE FROM: Rudy Limeback

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QUESTION POSED ON: 16 July 2008
Suppose there is a table as below:

SkillName SkillCode Beginner Proficient Experienced Java 001 2 0 0 Java 001 0 3 0 Java 001 0 0 1

The above table suggests that for the skill Java, there are 2 Beginners, 3 Proficient and 1 Experienced people. I need to write a query which will query the above table and retrieve the results in the form given below, combining the rows:

SkillName SkillCode Beginner Proficient Experienced Java 001 2 3 1

Can you explain me as to how to go about this? An example would be much better. Thanks in advance.

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The best example to explain this concept is your own:

SELECT SkillName 
     , SkillCode 
     , SUM(Beginner)    AS Beginner     
     , SUM(Proficient)  AS Proficient   
     , SUM(Experienced) AS Experienced   
  FROM yourtable
GROUP
    BY SkillName 
     , SkillCode

To understand how this query works, you will need to do some research on two concepts: GROUP BY and aggregate functions, specifically SUM(). Every basic SQL tutorial or textbook will cover these concepts in sufficient detail.

Good luck and welcome to the wonderful world of SQL.

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