Split comma separated string table row into separate rows using TSQL

Question

Say I have a query that returns the following

ID       SomeValue
1        a,b,c,d
2        e,f,g

Id like to return this as follows:

Answer 1

I know this is an older post but I wanted to add my solution so that I can find it in the future. I had to make a slight tweak to Stephan's Solution to account for values that do NOT contain a delimiter:

DECLARE @yourTable TABLE(ID INT,SomeValue VARCHAR(25));

INSERT INTO @yourTable
VALUES  (1,'a,b,c,d'),
        (2,'e'),
        (3,'f'),
        (4,'g,h,i');

WITH CTE
AS
(
    SELECT  ID,
            [xml_val] = CAST('' +
                                CASE WHEN  CHARINDEX(',', SomeValue) > 0
                                    THEN REPLACE(SomeValue,',','') 
                                    ELSE SomeValue
                                END + '' AS XML)
    FROM @yourTable
)

SELECT  ID,
        [SomeValue] = col.value('.','VARCHAR(100)')
FROM CTE
CROSS APPLY [xml_val].nodes('/t') CA(col)