nvarchar

问题 I want insert all rows of a table into another table, and I also want convert a nvarchar field into bigint , but when I use convert(bigint, col1) SQL Server shows an error: Error converting data type nvarchar to bigint How can I fix this problem? 回答1: You could try to use ISNUMERIC to determine those rows that are indeed numeric: UPDATE dbo.YourTable SET BigIntColumn = CAST(NVarcharColumn AS BIGINT) WHERE ISNUMERIC(NVarcharColumn) = 1 That would convert those rows that can be converted - the

问题 Here is my predicament. Basically, I need a column in a table to hold up an unknown length of characters. But I was curious if in Sql Server performance problems could arise using a VARCHAR(MAX) or NVARCHAR(MAX) in a column, such as: 'This time' I only need to store 3 characters and most of the time I only need to store 10 characters. But there is a small chances that It could be up to a couple thousand characters in that column, or even possibly a million, It is unpredictable. But, I can

问题 When inserting strings in an oracle database, some national characters are replaced with question marks, even though they are inserted in an NCHAR or NVARCHAR column - that should be able to handle all Unicode characters. This happens using either Oracle's SQL Developer, sqlplus or using the JDBC driver. The database NLS_CHARACTERSET is set to WE8ISO8859P1 (western european iso-8859-1) The NLS_NCHAR_CHARACTERSET used for NCHAR columns is set to AL16UTF16. (UTF-16) Any character not in the NLS

问题 When you add pass a new job_type to sys.sp_cdc_add_job @job_type, (which is of type nvarchar(20) ) You can pass the argument as either N' cleanup' cleanup Are there any reasons or benefits to use the former syntax using N' to pass the argument to stored procedures? 回答1: Only if the string contains unicode characters The string is implictly converted to nvarchar when the passed into the stored proc. However, before SP execution, it's a literal varchar ("character string constant") without N

问题 I have table with a column as NVARCHAR2 , and I have build my object with hibernate annotations, When i want to insert into DB or fetch from DB the result is something like that "???????", I have implemented a custom Dialect as follows but it did not work. public class CustomOracleDialect extends Oracle10gDialect{ public CMSCustomOracleDialect() { registerHibernateType( Types.NVARCHAR, Hibernate.STRING.getName() ); registerColumnType( Types.VARCHAR, "nvarchar2($1)" ); registerColumnType(

问题 ​Stack : Installed HDP-2.3.2.0-2950 using Ambari 2.1 The steps that I am following : ​ Load SQL server tables onto HDFS using Sqoop Create EXTERNAL tables in Hive I didn't use anything pertaining to charset/unicode/utf-8 while executing the sqoop import commands and the import was successful While creating the Hive external table, I was wondering what data type shall I select for the nvarchar columns in the original sql server table, now I am worried that even in Sqoop while importing that

问题 When designing a database, what decisions do you consider when deciding how big your nvarchar should be. If i was to make an address table my gut reaction would be for address line 1 to be nvarchar(255) like an old access database. I have found using this has got me in bother with the old 'The string would be truncated'. I know that this can be prevented by limiting the input box but if a user really has a address line one that is over 255 this should be allowed. How big should I make my

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 7 years ago . VARCHAR does not store Unicode characters. NVARCHAR does store Unicode characters. Today's applications should always be Unicode

问题 I have discovered a huge performance problem in Linq to SQL. When selecting from a table using strings, the parameters passed to sql server are always nvarchar, even when the sql table is a varchar. This results in table scans instead of seeks, a massive performance issue. var q = ( from a in tbl where a.index == "TEST" select a) var qa = q.ToArray(); The parameter is passed through as a nvarchar, which results in the entire index being converted from varchar to nvarchar before being used. If

问题 IVe read a lot about this. Still some questions : Im not talking about case sensitive here... If I have a char ( ש for example) and he is stored in nvarchar - which can hold anything , Why would I need collation here ? If I'm "FaceBook" and i need the ability to store all chars from all languages , What is the relationship between the collation and my nvarchar columns ? Thanks in advance. 回答1: Storing and representing characters is one thing, and knowing how to sort and compare them is