❮ 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:...
Otherwise, use the CAST function to explicitly convert character_expression.Напомена If string_expression is of type binary or varbinary, LEFT will perform an implicit conversion to varchar, and therefore will not preserve the binary input....
CreateFunctionStatement CreateIndexStatement CreateLoginSource CreateLoginStatement CreateMasterKeyStatement CreateMessageTypeStatement CreateOrAlterFunctionStatement CreateOrAlterProcedureStatement CreateOrAlterTriggerStatement CreateOrAlterViewStatement CreatePartitionFunctionStatement CreatePartitionSchemeStatement CreateProcedure...
--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 ''...
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 ...
(繼承自 TSqlFragment。) FragmentLength Gets the fragment length. (繼承自 TSqlFragment。) LastTokenIndex Gets or sets the last token index. (繼承自 TSqlFragment。) Parameters Gets a list of function parameters. ScriptTokenStream Gets or sets a list of token streams. (繼承自 TSqlFragment。)...
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. ...
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...
I am using the Left function to get first two letters of a Postal Code, however in some of the postal codes the first two characters contains a number. How can I ignore the number in the postal codes which have a number in the first two characters. ...