SQL Server - Possible Pivot Solution?

Question

I have a simple enough issue that has been surprisingly difficult to locate online. Perhaps I am searching on improper keywords so I wanted to stop in and ask you guys becau

Answer 1

In SQL-Server use the FOR XML Path Method:

SELECT  Student,
        Total,
        STUFF(( SELECT  ', ' + BookID
                FROM    MyStudies books
                WHERE   Books.Student = MyStudies.Student
                FOR XML PATH(''), TYPE
                ).value('.', 'VARCHAR(MAX)'), 1, 2, '') AS Books
FROM    (   SELECT  Student, COUNT(*) AS Total
            FROM    myStudies
            GROUP BY Student
        ) MyStudies

I have previously given a full explanation of how the XML PATH Method works here. With a further improvement to my answer pointed out here

SQL Server Fiddle

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In MySQL AND SQLite you can use the GROUP_CONCAT function:

SELECT  Student, 
        COUNT(*) AS Total, 
        GROUP_CONCAT(BookID) AS Books
FROM    myStudies
GROUP BY Student

MySQL Fiddle

SQLite Fiddle

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In Postgresql you can use the ARRAY_AGG Function:

SELECT  Student, 
        COUNT(*) AS Total, 
        ARRAY_AGG(BookID) AS Books
FROM    myStudies
GROUP BY Student

Postgresql Fiddle

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In oracle you can use the LISTAGG Function

SELECT  Student, 
        COUNT(*) AS Total, 
        LISTAGG(BookID, ', ') WITHIN GROUP (ORDER BY BookID) AS Books
FROM    myStudies
GROUP BY Student

Oracle SQL Fiddle

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