It deletes a specified length of characters in the first string at the start position and then inserts the second string into the first string at the start position. STUFF ( character_expression , start , length , replaceWith_expression ) 1. 参数说明: start:整数,表示删除和插入的开始位置;如...
我们可以根据返回值进行相应的错误处理: DECLARE@textNVARCHAR(100)='Learning SQL Server';DECLARE@charNCHAR(1)='x';DECLARE@positionINT;SET@position=CHARINDEX(@char,@text);IF@position=0BEGINPRINT'Character not found in the string.';ENDELSEBEGINPRINT'Character found at position: '+CAST(@positionASNV...
substring(string,start,length) 参数描述同mid()函数一样,第一个参数为要处理的字符串,start开始位置,length为截取的长度 用法: substr(database(),1,1)>'a',查看数据库名第一位,substr(database(),2,1)查看数据库名第二位,依次查看各位字符。 substr((select table_name from information_schema.tables wh...
A. Using SUBSTRING with a character string The following example shows how to return only a part of a character string. From the Contact table, this query returns the last name in one column with only the first initial in the second column. Copy USE AdventureWorks; GO SELECT LastName, SUBS...
SUBSTRING( expression, start, length ) 参数 expression 为character、binary、text、ntext 或者 image表达式。 start 指定返回字符的起始位置的整数或 bigint 表达式 。 (编号从 1 开始,意味着表达式中的第一个字符为 1)。 如果 start 小于 1,则返回的表达式的起始位置为表达式中指定的第一个字符 。 在这种情况...
在SQL中,要从特殊字符中查找第二个字符,可以使用字符串函数和操作符来实现。以下是一种常见的方法: 1. 使用SUBSTRING函数:SUBSTRING函数用于从给定字符串中提取子字符串。语法如下:...
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 until the end of the string. ...
Does anyone know how to find a period character in a string? Does case sensitivity affect variable names in stored procedures of case sensitive databases ? Does LIKE support (or can you code for) an optional character in a string? Does order matter when doing INSERT? Does SmallDateTime DateTy...
INSTR(string, substring [, start_position [, occurrence]]) The string is the original string you want to find the substring. The substring is what you are looking for in the string. The start_position (optional) is where you begin. If it's not specified, the search starts from the beg...
SET TEXTSIZE 0; -- Create variables for the character string and for the current -- position in the string. DECLARE @position INT, @string CHAR(8); -- Initialize the current position and the string variables. SET @position = 1; SET @string = 'New Moon'; WHILE @position <= DATALENGTH...