SUBSTRING ( expression, start, length ) Nota Per visualizzare la sintassi Transact-SQL per SQL Server 2014 (12.x) e versioni precedenti, vedere la documentazione delle versioni precedenti.Argomentiexpression È un'espressione di tipo character, binary, text, ntext, o image.start...
Microsoft SQL Server 将保留关键字用于定义、操作和访问数据库。 保留关键字是 SQL Server 使用的 Transact-SQL 语言语法的一部分,用于分析和理解 Transact-SQL 语句和批处理。 尽管在 Transact-SQL 脚本中使用 SQL Server 保留关键字作为标识符和对象名在语法上是可行的,但规定只能使用分隔标识符。 下表列出了 SQ...
Applies to:SQL ServerAzure SQL DatabaseAzure SQL Managed Instance Creates a user-defined function (UDF), which is a Transact-SQL or common language runtime (CLR) routine. A user-defined function accepts parameters, performs an action such as a complex calculation, and returns the result of ...
Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Includes all connection information that is required to access remote data from an OLE DB data source. This method is an alternative to accessing tables in a linked server and is a one-time, ad hoc method of connecting ...
The rules also specify the code page that's used to store non-Unicode character data. Both Unicode and non-Unicode sorting are compatible with string comparisons in a particular version of Windows. This provides consistency across data types within SQL Server, and it lets developers sort strings...
There are two types of binary collations in SQL Server:The legacy BIN collations, which performed an incomplete code-point-to-code-point comparison for Unicode data. Legacy binary collations compared the first character as WCHAR, followed by a byte-by-byte comparison. In a BIN colla...
Microsoft SQL Server 将保留关键字用于定义、操作和访问数据库。保留关键字是 SQL Server 使用的 Transact-SQL 语言语法的一部分,用于分析和理解 Transact-SQL 语句和批处理。尽管在 Transact-SQL 脚本中使用 SQL Server 保留关键字作为标识符和对象名在语法上是可行的,但规定只能使用分隔标识符。
"EXECUTE AT" with Dynamic Linked Server Name "explicit value must be specified for identity column in table" error in SQL 2000 "FROM clause have the same exposed names. Use correlation names to distinguish them" "No transaction is active." error when trying to send a transactional SQL statmen...
Server Developers face is the need to extract a portion of a string from a larger text field to display the information in a more concise format or perform calculations/analysis on a specific substring of the data. How do you extract only a specific portion of the string in SQL Server?
start– specifies the starting point of the first character you want to return. SQL Server starts counting at 1. So SUBSTRING('MSSQLTips',3,3) returns 'SQL', SUBSTRING('MSSQLTips',6,3) returns 'Tip'. If you have a length below 1, SQL Server will count back although it will not ...