❮ Previous ❮ SQL Server Functions Next ❯ ExampleGet your own SQL Server Extract 3 characters from a string (starting from left): SELECT LEFT('SQL Tutorial', 3) AS ExtractString; Try it Yourself » Definition and UsageThe LEFT() function extracts a number of characters from a ...
SQL Server LEFT Functions LEFT(string, n)函数,是处理字符数据获取子字符串。第一个参数是将要处理的字符串,第二个参数,是从字符串的左边开始截取的字符个数。 例子: DECLARE@stringNVARCHAR(50)='Mr. John' SELECTLEFT(@string,3)AS[New String] 结果:...
this.txtCode.Text=nextID.ToString().PadLeft(6,'0'); 在sql中 --功能:右对齐的字符,在左边用指定的字符填充以达到指定的总长度。 :原始字符@paddingChar:填充字符@totalWidth:结果字符串中的字符数 --create by guoliang 2009/06/12 createfunctionPadLeft(@numvarchar(16),@paddingCharchar(1),@totalWid...
Is anexpressionof character or binary data.character_expressioncan be a constant, variable, or column.character_expressioncan be of any data type, excepttextorntext, that can be implicitly converted tovarcharornvarchar. Otherwise, use theCASTfunction to explicitly convertcharacter_expression. ...
--ORACLE数据库内创建LEFT CREATE OR REPLACE FUNCTION "LEFT" (str in varchar2,sublen in integer) return varchar2 is strlen integer; begin strlen := length(str); if sublen<=0 then return ''; elsif strlen<=sublen then return str; else return SUBSTR(str,0,sublen); end if; return ''...
LEFT()函数是一个字符串函数,它返回具有指定长度的字符串的左边部分。 下面是LEFT()函数的语法 - LEFT(str,length); 1. LEFT()函数接受两个参数: str是要提取子字符串的字符串。 length是一个正整数,指定将从左边返回的字符数。 LEFT()函数返回str字符串中最左边的长度字符。如果str或length参数为NULL,则返...
SQL SQL Server 2012 Microsoft.SqlServer.TransactSql.ScriptDom C# 使用英语阅读添加 打印 TwitterLinkedInFacebook电子邮件 项目 2013/04/26 本文内容 继承层次结构 语法 构造函数 属性 显示另外 3 个 Represents LEFT function call. 继承层次结构 System.Object ...
The LEFT_SHIFT function is also accessible through the << operator. Transact-SQL syntax conventions Syntax syntaxsql Kopija LEFT_SHIFT ( expression_value, shift_amount ) expression_value << shift_amount Arguments expression_value Any integer or binary expression that isn't a large object (LOB...
❮ MySQL FunctionsExampleGet your own SQL ServerExtract 3 characters from a string (starting from left):SELECT LEFT("SQL Tutorial", 3) AS ExtractString; Try it Yourself » Definition and UsageThe LEFT() function extracts a number of characters from a string (starting from left)....
create function PadLeft(@num varchar(16),@paddingChar char(1),@totalWidth int) returns varchar(16) as begin declare @curStr varchar(16) select @curStr = isnull(replicate(@paddingChar,@totalWidth - len(isnull(@num ,0))), '') + @num ...