语法1:substr(string A, int start),substring(string A, int start) 返回值:string 说明:返回字符串A从start位置到结尾的字符串 语法2:substr(string A, int start, int len),substring(string A, int start, int len) 返回值:string 说明:返回字符串A从start位置开始,长度为len的字符串 ...
SELECT SUBSTRING_INDEX('www.mysql.com', '.', -2); mysql.com 获取第1个元素比较容易,获取第2个元素/第n个元素可以采用二次拆分的写法。 SUBSTRING_INDEX('www.mysql.com', '.', 1) www SUBSTRING_INDEX(SUBSTRING_INDEX('www.mysql.com', '.', 2), '.', -1) | 字符串查询 LEN(str)...
,endtext (val)as(selectsubstring((selectvalfromdata),s2,f1)fromstartFinishRep) ,Oldval (val)as(selectSUBSTRING((selectvalfromdata),start,fin-start)fromStartFinishVal) ,newval (val)as(selectreplace(val,'_','@@')fromOldval)select(selectvalfromstarttext)+(selectvalfromnew...
I have a problem, to select a substring from a string. The string after equal. My example looks like this one. string='test = 1234sg654' My idea was to select the string after the equal "1234sg654", in this way: with Instr() find position of equal, after that with Substr(), ...
SUBSTRING函数:该函数用于从一个字符串中提取子字符串。可以指定起始位置和要提取的字符数。例如,使用SUBSTRING函数可以从一个字段中提取关键字后的子字符串。 CHARINDEX函数:该函数用于查找一个字符串中某个子字符串的起始位置。可以结合SUBSTRING函数使用,先使用CHARINDEX函数找到关键字的位置,然后再使用SUBSTRING函数...
SUBSTRING(string FROM position); 1. 2. 有两个参数: string参数是要提取子字符串的字符串。 position参数是一个整数,用于指定子串的起始字符, position可以是正或负整数。如果position为正,则SUBSTRING函数从字符串的开始处提取子字符串 9)ifnull函数
一,SubString 截取子串 最常用的字符串函数,用于截取特定长度的子串。 SUBSTRING ( expression ,start , length ) 1. 参数说明: start 参数:整数,表示开始位置;字符的序号(index)从1开始,即第一个字符的序号是1; length参数:整数,表示截取字符的最大数量;如果start+Length 大于字符串的总长度,那么返回从Start开始...
-- Find space in name: SET @SpaceIndex = CHARINDEX(' ' , @LastName) IF @SpaceIndex > 0 -- Space: Capitalize first & substring SELECT UPPER(LEFT(@LastName, 1)) + LOWER(SUBSTRING(@LastName, 2, @SpaceIndex - 1)) + UPPER(SUBSTRING(@LastName, @SpaceIndex + 1, 1)) + LOWER(...
Truncating a String to a Specific Length with the SQL SUBSTRING Function Suppose you have a string column in a table that contains product descriptions that are sometimes longer than the desired maximum length of 50 characters. To truncate the description to 50 characters (if necessary), you can...
Using the SQL Server Substring function, the numeric sub-set of a string from the column col is transformed using CHARINDEX. You can also use the SQL string function PATINDEX to find the initial position and length parameter of the SQL SUBSTRING function. 1 2 3 4 5 6 7 8 9 10 11 ...