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    <p><a href="http://www.sommarskog.se/arrays-in-sql-2005.html#tblnum" rel="nofollow noreferrer">I prefer the number table approach to split a string in TSQL</a></p> <p>For this method to work, you need to do this one time table setup:</p> <pre><code>SELECT TOP 10000 IDENTITY(int,1,1) AS Number INTO Numbers FROM sys.objects s1 CROSS JOIN sys.objects s2 ALTER TABLE Numbers ADD CONSTRAINT PK_Numbers PRIMARY KEY CLUSTERED (Number) </code></pre> <p>Once the Numbers table is set up, create this split function:</p> <pre><code>CREATE FUNCTION [dbo].[FN_ListToTable] ( @SplitOn char(1) --REQUIRED, the character to split the @List string on ,@List varchar(8000)--REQUIRED, the list to split apart ) RETURNS TABLE AS RETURN ( ---------------- --SINGLE QUERY-- --this will not return empty rows ---------------- SELECT ListValue FROM (SELECT LTRIM(RTRIM(SUBSTRING(List2, number+1, CHARINDEX(@SplitOn, List2, number+1)-number - 1))) AS ListValue FROM ( SELECT @SplitOn + @List + @SplitOn AS List2 ) AS dt INNER JOIN Numbers n ON n.Number &lt; LEN(dt.List2) WHERE SUBSTRING(List2, number, 1) = @SplitOn ) dt2 WHERE ListValue IS NOT NULL AND ListValue!='' ); GO </code></pre> <p>You can now easily split a CSV string into a table and join on it:</p> <pre><code>select * from dbo.FN_ListToTable(',','1,2,3,,,4,5,6777,,,') </code></pre> <p>OUTPUT:</p> <pre><code>ListValue ----------------------- 1 2 3 4 5 6777 (6 row(s) affected) </code></pre> <p>Your can now use a CROSS APPLY to split every row in your table like:</p> <pre><code>DECLARE @YourTable table (NameList varchar(5000), TimeOf int) INSERT INTO @YourTable VALUES ('John Smith, Jeremy Boyle, Robert Brits, George Aldrich', 5) INSERT INTO @YourTable VALUES ('John Smith, Peter Hanson', 15) INSERT INTO @YourTable VALUES ('Jeremy Boyle, Robert Brits', 10) SELECT st.ListValue AS NameOf, SUM(o.TimeOf) AS TimeOf FROM @YourTable o CROSS APPLY dbo.FN_ListToTable(',',o.NameList) AS st GROUP BY st.ListValue ORDER BY st.ListValue </code></pre> <p>OUTPUT:</p> <pre><code>NameOf TimeOf ----------------------- ----------- George Aldrich 5 Jeremy Boyle 15 John Smith 20 Peter Hanson 15 Robert Brits 15 (5 row(s) affected) </code></pre> <p>Using this, I would recommend that you alter your table design and use this output to INSERT into a new table. That would be a more normalized approach. Also Don't use reserved words for column names, it makes it a hassle. Notice how I use "NameOf" and "TimeOf", so I avoid using reserved words.</p>
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    1. CO+1 This works. Might simplify a bit by removing the "dt" subquery
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    2. COyea, now that I look at it, why was I using the derived table?
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    3. CO+1 for the link (not only but also)
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