split sql column into two with delimiter

I have a column in a table (named 'docksTemp) that has dimensional data in it, like this 12x18

I need it seperated into two columns and drop the 'x'

initial column name is Dimensions, I want that parsed out to DimensionWidth and DimensionLength

I use these two commands:

UPDATE docksTemp
SET DimensionWidth = LEFT(Dimensions,CHARINDEX('x',Dimensions)-1)

UPDATE docksTemp
SET DimensionLength = RIGHT(Dimensions,LEN(Dimensions)-CHARINDEX('x',Dimensions))

The length portion of it works, it seperates the data no problem.  the first part with the width doesn't work I get a

ERROR: Invalid length parameter passed to the LEFT or SUBSTRING
function. Error Code: 537

If I use the same command but add a where clause and just do one statement at a time that create the correct results.  So what I think is its having problems when there might be a field with no data in it?  I can I get it deal with that?

Baub EisAsked:
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Jim HornMicrosoft SQL Server Data DudeCommented:
Sounds like you need a CASE block to test for non-nulls and 'x' values.  Copy-paste the below into your SSMS, execute it to verify it works as you need, then modify to fit your situation
-- This returns values 12 and 18
Declare @x varchar(10) = '12x18'

-- These will return no value, and will not error
-- Declare @x varchar(10) = '12', 'banana', NULL

   CASE WHEN LEN(ISNULL(@x, '')) > 0 AND CHARINDEX('x', @x) > 1 THEN LEFT(@x,CHARINDEX('x',@x)-1)
   ELSE '' END as the_height

   CASE WHEN LEN(ISNULL(@x, '')) > 0 AND CHARINDEX('x', @x) > 1 THEN RIGHT(@x,LEN(@x)-CHARINDEX('x',@x))
   ELSE '' END as the_width

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Baub EisAuthor Commented:
That did the trick thanks!
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