### 步骤四:使用SUBSTRING函数截取字符串 最后,在步骤四中,我们将使用MySQL的`SUBSTRING`函数来截取字符串的后几位。你可以使用以下代码来进行截取操作: ```markdown ```python # 查询并截取字符串的后几位 select_query = ''' SELECT SUBSTRING(text_column, -5) AS last_five_characters FROM test_table '...
以下是一个完整的SQL查询示例: SELECTusername,SUBSTRING(username,-4)ASlast_four_charactersFROMusers; 1. 2. 3. 查询结果 执行以上查询后,我们将得到如下结果: 通过这种方式,我们能够轻松地获取到每个用户名的后四位字符。 应用场景 字符串截取在实际开发中有多种应用场景。例如: 数据清洗:在迁移数据时,有时候...
The SUBSTRING() function extracts a substring from a string (starting at any position).Note: The position of the first character in the string is 1.1 2 3 4 5 6 7 8 9 10 11 12 S Q L T u t o r i a lNote: The position of the last character in the string is -1....
MySQL Substring () function usually consists of three arguments first part is for the string. The second part is to specify the starting point from where you are willing to trim the data. The third part is the length of the substring which means the number of characters we are trying to ...
The following query returns 4 characters starting from 3 position from the string 'abcdefgh' SELECT SUBSTRING('abcdefgh',3,4); --- cdef The following query returns the initial character of firstname from employees table SELECT SUBSTRING(firstname,1,...
SUBSTRING('w3resource', 4, 3); Explanation: Extract a substring from the given string 'w3resource'. SUBSTRING(), which takes three arguments: Input String: 'w3resource'. Start Position: 4, starting from the 4th character. Length: 3, extracting 3 characters. ...
SELECT substring(contactLastName,2,3) from customers; MID- 从字符串中提取子字符串(从任何位置开始). SELECT mid(contactLastName,2,3) from customers; REPLACE- 搜索并替换字符串中的子字符串。 INSERT- 在指定位置的字符串中插入一个字符串,并替换原字符串中相应数量的字符。
在MySQL 中,可以使用正则表达式结合内置函数来提取字符串中的所有数字。...现在需要将该字符串中的所有数字提取出来,并以逗号分隔返回结果。...方法二:使用 REGEXP 和 REPLACE 函数除此之外,还可以利用 MySQL 的内置函数将字符串中的非数字字符逐个替换为空字符串,从
SUBSTRING(‘THIS IS A SAMPLE, -11,2) To extract the below value: -11 is the position from the right where the starting point would be. And 2 characters will be extracted towards the right as shown above. We need to be careful with mentioning the length as it would be considered right...
These substrings can be referenced in the replacement string: An instance of N in the replacement string causes insertion of the N-th substring matched by the pattern. For example, the following command matches strawberry and replaces it with raspberry and strawberry: --replace_regex /(...