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).Tip: Also look at the RIGHT() function.SyntaxLEFT(string, number_of_chars)...
LEFT() function MySQL LEFT() returns a specified number of characters from the left of the string. Both the number and the string are supplied as arguments of the function. This function is useful in - Substring extraction: It extracts characters from the left side of a string. ...
mysql> select sbustr(@str,4,3) as result; ERROR 1305 (42000): FUNCTION test.sbustr does not exist mysql> select sbustring(@str,4,3) as result; ERROR 1305 (42000): FUNCTION test.sbustring does not exist mysql> select substring(@str,4,3) as result; +---+ | result | +---+ |...
string" should be NULL, especially when working in SQL mode 'traditional'. My environment: - Intel PC with Linux(SuSE 9.3) - MySQL compiled from source Version 5.0 ChangeSet@1.1867.1.1, 2005-07-01How to repeat:Please execute: SET sql_mode = 'traditional'; SELECT LEFT('a', NULL);...
返回soundex字符串 from str. Two strings that sound almost the same should have identical soundex strings. A standard soundex string is four characters long, but the SOUNDEX() function returns an arbitrarily long string. You can use SUBSTRING() on the result to get a standard soundex string. ...
https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_find-in-set SELECTFIND_IN_SET('b','a,b,c,d');-2 FORMAT(X,D[,locale]) 格式化一个数字,四舍五入至 D 位小数,返回结果是字符类型。 如果D = 0 。返回结果就没有小数部分 ...
如何使用LEFT函数从数字字符串中提取左侧的特定数量的字符? 基础概念 MySQL中的截取数字函数主要用于从字符串或数字中提取一部分。常用的截取数字函数包括SUBSTRING、SUBSTR、LEFT、RIGHT等。这些函数可以用于处理字符串,但在处理数字时,通常需要先将数字转换为字符串。 相关优势 灵活性:可以根据需要截取字符串或数字的不...
语义组:function_call_keyword CHAR 函数 CURRENT_USER 函数 DATE 函数 DAY 函数 HOUR 函数 INSERT 函数 INTERVAL 函数 JSON_VALUE 函数 LEFT 函数 MINUTE 函数 MONTH 函数 RIGHT 函数 SECOND 函数 TIME 函数 TIMESTAMP 函数 TRIM 函数 USER 函数 YEAR 函数 语义组:charset_name 语义组:optional_braces 语义组:opt...
]) -- 连接字串 charset(str) -- 返回字串字符集 lcase(string) -- 转换成小写 left(string, length) -- 从string2中的左边起取length个字符 load_file(file_name) -- 从文件读取内容 locate(substring, string [,start_position]) -- 同instr,但可指定开始位置 lpad(string, length, pad) -- 重复...
LEFT (string2 ,length ) //从string2中的左边起取length个字符 LENGTH (string ) //string长度 LOAD_FILE (file_name ) //从文件读取内容 LOCATE (substring , string [,start_position ] ) 同INSTR,但可指定开始位置 LPAD (string2 ,length ,pad ) //重复用pad加在string开头,直到字串长度为length ...