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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.

EXPERT RESPONSE

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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