CHAR_LENGTH / CHARACTER_LENGTH LENGTH 2、字符串查找 FIELD FIND_IN_SET INSTR LOCATE POSITION 3、字符串替换 INSERT REPLACE 4、字符串处理 CONCAT CONCAT_WS FORMAT LCASE / LOWER UCASE / UPPER LPAD RPAD LTRIM RTRIM TRIM REPEAT REVERSE SPACE STRCMP 5、字符串截取 LEFT RIGHT MID SUBSTR SUBSTRING SUBST...
character_set_client: utf8mb4 collation_connection: utf8mb4_0900_ai_ci 1 row in set (0.00 sec)“IF NOT EXISTS”与“OR REPLACE”不兼容，并且这两个从句不能同时使用“CREATE VIEW”语句。尝试这样做会导致语句将以语法错误被拒绝。向量数据类型：STRING_TO_VECTOR()函数现在允许在VECTOR参数的字符串...
9 10 /* retrieve the first character in the string */ 11 dbms_output.put_line ( SUBSTR (greetings, 1, 1)); 12 13 /* retrieve the last character in the string */ 14 dbms_output.put_line ( SUBSTR (greetings, -1, 1)); 15 16 /* retrieve five characters, 17 starting from the s...
10、匹配子串开始位置的函数 LOCATE(STR1,STR)、POSITION(STR1 IN STR)、INSTR(STR,STR1)3个函数作用相同,返回子字符串str1在字符串str中的开始位置 这三个函数跟SQLSERVER里的**CHARINDEX()**函数功能类似 代码语言:javascript 复制 SELECTLOCATE('ball','football'),POSITION('ball'IN'football'),INSTR('foo...
replicate(character_expression integer_expression)如果integer_expression值为负值,则返回null。 5.3 reverse() 格式:reverse(s) 其中s可以是字符串、常数或一个列的值。 将指定的字符串的字符排列顺序颠倒。 mysql>selectreverse("abcdef");+---+|reverse("abcdef")|+---+|fedcba|+---+1rowinset(0.06sec...
As you can see, there's an extra special character in there now, before the special character returned in the MySQL client. When I try to do the string replace, the string remains unchanged (in the debugger). Nothing is replaced, even though it's clearly in the string. Does str_replace...
(3),replace('admin','d','c');selectstrcmp('admin','zdmin'),strcmp('admin','admin'),strcmp('zdmin','admin');selectsubstring('admin',1,3),mid('admin',1,3);selectlocate('mi','admin'),position('mi'in'admin'),instr('admin','min');selectreverse('admin'),elt(3,'admin','...
.. replace from to [from to] ... < file_name from represents a string to look for and to represents its replacement. There can be one or more pairs of strings. Use the -- option to indicate where the string-replacement list ends and the file names begin. In this case, any file...
CHAR_ LENGTH(String) 该函数返回给定字符串的字符长度。这个函数与CHARACTER_ LENGTH( ) 函数是同义词。多字节字符被认为是一个字符。如果你要计算每一个字节, 请使用LENGTH( )函数。 CHARACTER_ LENGTH( ) 本函数返回给定字符串的字符长度。多字节字符被认为是一个字符。该函数与CHAR_ LENGTH( )函数是同义词。
Notetext in the binary character set is returned asBuffer, rather than a string. CHAR VARCHAR TINYTEXT MEDIUMTEXT LONGTEXT TEXT ENUM SET DECIMAL (may exceed float precision) TIME (could be mapped to Date, but what date would be set?) ...