❮Previous❮ SQL Server FunctionsNext❯ ExampleGet your own SQL Server Return the length of an expression (in bytes): SELECTDATALENGTH('W3Schools.com'); Try it Yourself » Definition and Usage The DATALENGTH() function returns the number of bytes used to represent an expression. ...
8) SUBSTRING() 语法:SUBSTRING(expression, start, length) 描述:返回 SQL Server 中的字符、二进制、文本或图像表达式的一部分。 示例:SELECTSUBSTRING('截取子字符串',, 1) AS Column1, SUBSTRING('截取子字符串',, 4) AS Column1, SUBSTRING('截取子字符串',, 3) AS Column1; 结果: 9) UPPER() ...
length必须是tinyint、smallint或int。如果length为整数,则将numeric_expression舍入到length指定的小数位数。如果length为负数,则将numeric_expression小数点左边部分舍入到length指定的长度。 function:要执行的操作的类型。function必须为tinyint、smallint或int。如果省略function或其值为0(默认值),则将舍入numeric_expre...
Applies to:SQL Server Returns the length of the string in characters. Syntax fn:string-length() as xs:integer fn:string-length($arg as xs:string?) as xs:integer Arguments $arg Source string whose length is to be computed. Remarks
SQL Server教程 - T-SQL-内置函数(Built-in Functions) 更新记录 转载请注明出处: 2022年8月1日 发布。 2022年7月2日 从笔记迁移到博客。 内置函数说明(FUNCTION) Sever 提供了众多功能强大、方便易用的函数。使用这些函数,可以极大地提高数据库的管理。SQL Server中的函数从功能方面主要分为以下几类:字符串...
下面的表格简要描述实现 SQL Server FUNCTION 表参数的整体流程: 每一步的详细实现 第一步:创建一个表类型 首先,我们需要定义一个表类型MyTableType,用于描述我们将要传递的数据的结构。 CREATETYPEMyTableTypeASTABLE(IDINT,Name NVARCHAR(50)); 1. 2. ...
SQL Server Advanced Functions FunctionDescription CASTConverts a value (of any type) into a specified datatype COALESCEReturns the first non-null value in a list CONVERTConverts a value (of any type) into a specified datatype CURRENT_USERReturns the name of the current user in the SQL Server...
If the value contains a 4-byte Unicode character that is represented by two surrogate characters, SQL Server will count the surrogate characters individually.The string-length() without a parameter can only be used inside a predicate. For example, the following query returns the <ROOT> element:...
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 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 ...