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I have a sybase table which has a column note varchar(1000) null.

The following T-SQL will get the following error if there is a not-null value in note. (sybase is the linked server to the Sybase database)

select * from (sybase, 'select note from table')
select * from (sybase, 'select left(note, 257) note from table')
select * from (sybase, 'select left(note, 1000) note from table')

OLE DB provider 'ASEOLEDB' for linked server 'sybase' returned data that does not match expected data length for column '[ASEOLEDB].note'. The (maximum) expected data length is 257, while the returned data length is 258.

However, it works if the length parameter is less and equal to 256.

select * from (sybase, 'select left(note, 256) note from table')

Also the following SQL works.

exec ('select note from table') at [sybase]

Is it a bug of the Sybase driver?

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select * from OPENQUERY(sybase, 'select left(cast(note as varchar(1000)), 257) note from table')
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It gets the error of "The (maximum) expected data length is 257, while the returned data length is 258". – u23432534 May 23 '12 at 16:58
Whats Sybase version you are connected to, what sybase driver are you using and whats your SQL server – AmmarR May 24 '12 at 4:42
The version is Adaptive Server Enterprise/12.5.4/EBF 16787 ESD#10/P/RS6000/AIX 5.1/ase1254/2159/64-bit/FBO/Mon Nov 2 10:11:59 2009. The driver is the OLEDB driver downloaded from sybase website. – u23432534 May 24 '12 at 17:47
I am using sybase driver 15.2 and i dont see the problem, your problem looks like its with the driver. I had many problems before with driver 12.5. If you can go for 15.2 try it – AmmarR May 24 '12 at 18:50

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