![]() The misconception happens because when using characters defined in the Unicode range 0 to 65,535, one character can be stored per each byte-pair. This is similar to the definition of char( n) and varchar( n). n never defines numbers of characters that can be stored. However, in nchar( n) and nvarchar( n), the n defines the string length in byte-pairs (0-4,000). RemarksĪ common misconception is to think that with nchar( n) and nvarchar( n), the n defines the number of characters. The ISO synonyms for nvarchar are national char varying and national character varying. For UTF-16 encoding, the storage size is still two times n bytes + 2 bytes, but the number of characters that can be stored may be smaller than n because Supplementary Characters use two byte-pairs (also called surrogate-pair). For UCS-2 encoding, the storage size is two times n bytes + 2 bytes and the number of characters that can be stored is also n. The storage size is two times n bytes + 2 bytes. max indicates that the maximum storage size is 2^31-1 characters (2 GB). n defines the string size in byte-pairs, and can be a value from 1 through 4,000. The ISO synonyms for nchar are national char and national character. For UTF-16 encoding, the storage size is still two times n bytes, but the number of characters that can be stored may be smaller than n because Supplementary Characters use two byte-pairs (also called surrogate-pair). For UCS-2 encoding, the storage size is two times n bytes and the number of characters that can be stored is also n. n defines the string size in byte-pairs, and must be a value from 1 through 4,000. ![]() If a non-SC collation is specified, then these data types store only the subset of character data supported by the UCS-2 character encoding. Starting with SQL Server 2012 (11.x), when a Supplementary Character (SC) enabled collation is used, these data types store the full range of Unicode character data and use the UTF-16 character encoding. But – the length of the value was 80 characters, and it was being truncated to 30 characters.Įventually, after asking around at work, someone mentioned that SQL Server truncates on Convert(varchar) if you don't put a length in – problem solved.Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW)Ĭharacter data types that are either fixed-size, nchar, or variable-size, nvarchar. Had to change that to "SELECT CONVERT(varchar,ParameterValue) AS ParameterValue FROM dbo.ref_Parameters WHERE = 'Something' AND = 'Path'" to at least get it putting something into my SSIS variable. My sql was "SELECT ParameterValue FROM dbo.ref_Parameters WHERE = 'Something' AND = 'Path'" ![]() I (following the naming standards where I currently work) named the columns, , and when I tried to bring in the value (ParameterValue) into and SSIS variable, found that I had to convert "ParameterValue" to a varchar (even though its a varchar in the database). I have a table (ref_Paramters) with one column declared as varchar(max). ![]() Thanks Aaron – I've just come across this issue after nearly 12 years of working with SQL Server (from 6.5->2005). I remember at the time that the limit wasn't well-documented.Īlso, sometimes you need to return four or five recordsets with transaction consistency, for the consumption of a C# function, which is just easier and cleaner with Stored Procs – Eventually you have to do a SELECT on the table variables, anyway. Oh well, I'm laid off now, so that's someone else's problem, like maybe one of you guys!!! □ If that's a problem, I guess I have some code out there that's truncating data! On Aaron's pet peeve, I've been guilty of using CONVERT() to VARCHAR (no size), and it seemed to work for long strings, but maybe I was just lucky. I THINK it was a varchar size limit of 256 and it must have been SQL 2000, but I just tried to Google it, and couldn't find any mention of the limitation. That's one reason why old-timers like me use Stored Procs that return recordsets instead of Table Valued Functions. When Table Variables first came out like a decade ago, I seem to remember a limitation that quickly blew my TVF's out of the water.
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