Help cast on simple SQL query

I have the following code to copy some data over:

/*
Update Documents Set EAD number
*/
UPDATE a
SET a.Ead = b.Description
FROM bluedot_eimmigration.dbo.Users a
    INNER JOIN [bluedot_eimmigration].[dbo].[zzz_eimmigration_customdocuments] AS b
        ON b.Userid = a.userid
WHERE b.DocName = 'EAD';

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The problem is that the field "EAD" is only 20 characters long and some of the 'b.Description'  data field are longer. I want to cut them off at 20 characters.
I tried the code below but didn't work:

UPDATE a
SET a.Ead = CAST(b.DescriptionAS VARCHAR(20)) AS Description,  
FROM bluedot_eimmigration.dbo.Users a
    INNER JOIN [bluedot_eimmigration].[dbo].[zzz_eimmigration_customdocuments] AS b
        ON b.Userid = a.userid
WHERE b.DocName = 'EAD';

Open in new window

LVL 1
AleksAsked:
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OMC2000Commented:
UPDATE a
SET a.Ead = substring(b.Description,1,20)
FROM bluedot_eimmigration.dbo.Users a
    INNER JOIN [bluedot_eimmigration].[dbo].[zzz_eimmigration_customdocuments] AS b
        ON b.Userid = a.userid
WHERE b.DocName = 'EAD';

Open in new window

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AleksAuthor Commented:
Thanks!
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Query Syntax

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