SQL Server Azure 数据工厂中的 SSIS Integration Runtime 返回字符表达式的一部分,该部分从指定位置开始并具有指定长度。position参数和length参数的取值必须为整数。 语法 SUBSTRING(character_expression, position, length) 参数 character_expression 是从中提取字符的字符表达式。
Microsoft Fabric 中的 SQL 分析端点 Microsoft Fabric 中的仓库 返回SQL Server 中的字符、二进制、文本或图像表达式的一部分。 Transact-SQL 语法约定 语法 syntaxsql SUBSTRING( expression, start, length ) 参数 expression 为character、binary、text、ntext 或者 image表达式。
SQL Server Azure 数据工厂中的 SSIS Integration Runtime 返回字符表达式的一部分,该部分从指定位置开始并具有指定长度。position参数和length参数的取值必须为整数。 语法 SUBSTRING(character_expression, position, length) 参数 character_expression 是从中提取字符的字符表达式。
Returns part of a character, binary, text, or image expression. For more information about the valid SQL Server data types that can be used with this function, seeData Types (Transact-SQL). Transact-SQL Syntax Conventions Syntax SUBSTRING (value_expression ,start_expression ,length_expression ) ...
SUBSTRING works only with the DT_WSTR data type. A character_expression argument that is a string literal or a data column with the DT_STR data type is implicitly cast to the DT_WSTR data type before SUBSTRING performs its operation. Other data types must be explicitly cast to the DT_WS...
The SUBSTRING function returns part of either a character or binary string, or a text string, and takes the following parameters: A character or binary string, a column name, or a string-valued expression that includes a column name.
The first character of a string is located at position 1. If the value of$sourceStringis the empty sequence, it is handled as the zero-length string. Otherwise, if either$startingLocor$lengthis the empty sequence, the empty sequence is returned. ...
- No code changes. Added notes 7, 8, and 9 about certain "optimizations" that don't actually work for this type of function. Rev 04 - 29 Jun 2010 - Jeff Moden - Added WITH SCHEMABINDING thanks to a note by Paul White. This prevents an unnecessary "Table Spool" when the ...
should fix it for you.
if the length specified for SUBSTRING is longer than there are characters, everything is returned until the last character. This avoids having us writing a more complicated expression to calculate the correct length, while the only thing we want is the substring from a certain position right unti...