inserting from one table to another different descriptions

I am running the following script

SET account_description = [is].[New Account Description]
FROM dbo.coa b
inner jOIN dbo.coaimport [is]  ON
[is].[account code] = b.account_code

I am receiving this error

Msg 8152, Level 16, State 2, Line 1
String or binary data would be truncated.
The statement has been terminated.

I suspect my account team have gone to down with their descriptions....
and it is over the column limit, would that be right.
Amanda WalshawBusiness Solutions AnalsystAsked:
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Brian CroweDatabase AdministratorCommented:
You can cast or substring the source string once you determine which column is the issue.  You need to obtain the schema information for both tables before we can give you any more detailed direction.
>> it is over the column limit, would that be right.

could it be a change of data type perhaps?
e.g. account_description varchar and [new description] nvarchar

or that simply the old field is a smaller allowed length then the new

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Scott PletcherSenior DBACommented:
This will show you the account code, the new description that is too long, and the current description:

SELECT [is].[account code], [is].[New Account Description], b.account_description
FROM dbo.coa b
inner jOIN dbo.coaimport [is]  ON
    [is].[account code] = b.account_code
    LEN([is].[New Account Description]) > COL_LENGTH('dbo.coa', 'account_description') --/2 --if datatype of account_description is nvarchar, divide by 2
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