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  • Pivoting in sql

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    Pivoting in sql

                     Pivoting in sql means changing rows to columns and columns to rows. We often need to change rows to columns in some scenario. Suppose I have a table say "Users" having columns Id,Name and UserType. Now if there is requirement to find number of users under each UserType I can use GROUP BY clause. But if I want UserType as Column and under them count of users in each UserType I can simply pivot the table we obtain from GROUP BY clause.

    Example

    1) Here is my Users table.

    SELECT * FROM Users

    2) To find number of user in each UserType we can use GROUP BY clause.

    SELECT UserType,Count(*) As 'Number of Users' FROM Users GROUP BY UserType

    3) Now pivoting table.

    SELECT 'Number of Users' As UserType,[1],[2],[3] FROM (SELECT UserType FROM Users) AS SourceTable
    PIVOT  
    (  
    Count(SourceTable.UserType)  
    FOR UserType IN ([1],[2],[3])  
    ) AS PivotTable; 

    If I only want value of UserType as column and count of user then I can use the following query.

    SELECT [1],[2],[3] FROM (SELECT UserType FROM Users) AS SourceTable
    PIVOT  
    (  
    Count(SourceTable.UserType)  
    FOR UserType IN ([1],[2],[3])  
    ) AS PivotTable; 

     

     

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