与大多数 SQL 字符串函数不同,SUBSTRING 可以与流数据一起使用。字符串表达式可以是数据类型为 %Stream.GlobalCharacter 或%Stream.GlobalBinary 的字段。 SUBSTRING 将提取的流数据子集作为 %String 数据类型返回。如果 start=1 并且省略了 length,则 SUBSTRING 以%String 形
syntaxsql SUBSTRING( expression , start [ , length ] ) Arguments expression Acharacter,binary,text,ntext, orimageexpression. start An integer orbigintexpression that specifies where the returned characters start. (The numbering is 1 based, meaning that the first character in the expression is 1)...
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 r...
SELECT ID, FIRST_NAME, SUBSTRING(FIRST_NAME, 2, 5) AS NEW_NAME FROM CUSTOMERS; OutputFollowing is the output of the above SQL query −+---+---+---+ | ID | FIRST_NAME | NEW_NAME | +---+---+---+ | 1 | Rohan | ohan | | 2 | Kamlesh | amles | | 3 | Seeta | e...
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。
SUBSTRING可用作ODBC标量函数(使用大括号语法)或SQL通用函数。 返回值 如果string-expression是任何%String数据类型,则SUBSTRING返回值是与string-expression数据类型相同的数据类型。这允许SUBSTRING使用特殊编码处理用户定义的字符串数据类型。 如果string-expression不是%String数据类型(例如,%Stream.GlobalCharacter),则SUBSTRIN...
For DBCLOBs, this is the first character. The start byte or character is numbered 1. SQLINTEGER ForLength input This is the length of the string to be returned by the function. For BLOBs and CLOBs, this is the length in bytes. For DBCLOBs, this is the length in characters. If...
The start and length parameters are specified as number of characters for character data types and bytes for binary data types Example #This example returns part of a string that is 3 characters long.SELECT SUBSTRING('My SQL Tutorial', 4, 3) AS PartTry...
适用范围: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 复制 SUBSTRING(character_expression, position, length) 参数 character_expression 是从中提取字符的字符表达式。 position 是一...
Use LEFT() for the first n character strings in MySQL. In SQLite you can use right_() to retrieve string nchars. How do I get the first 10 characters of a string in SQL? SQL Server LEFT() Function. The LEFT() function removes a string (beginning from left) from the string. ...