How to use MySQL's RPAD function to pad specified characters on the right side of a string

How to use MySQL's RPAD function to fill the right side of a string with specified characters

In daily development, we often encounter situations where strings need to be processed. In MySQL, a series of functions are provided to meet such needs. One of them is the RPAD function, which pads specified characters on the right side of a string.

The basic syntax of the RPAD function is as follows:

RPAD(str, len, pad)

Among them, str is the string to be filled, len is the total length of the final string, and pad is the character to be filled.

The following code example demonstrates how to use the RPAD function:

-- 创建一个示例表
CREATE TABLE example (
    id INT PRIMARY KEY AUTO_INCREMENT,
    name VARCHAR(10),
    phone VARCHAR(15)
);

-- 插入一条示例数据
INSERT INTO example (name, phone) VALUES ('Tom', '123456');

-- 查询示例数据，使用RPAD函数在name字段右侧填充字符'*'
SELECT id, RPAD(name, 10, '*') AS name, phone FROM example;

The above code creates a table named example and inserts a sample data. The next query statement uses the RPAD function, fills the character '*' on the right side of the name field, and renames the result to name.

After executing the above query statement, you will get the following results:

id | name      | phone
---+-----------+---------
1  | 'Tom*****' | 123456

As you can see, the RPAD function successfully filled in the right side of the name field with the character '*', and the final character The length of the string is 10.

In addition to padding on the right side of the string, the RPAD function can also pad on the left side of the string. Just set the len parameter to a negative number. For example, RPAD(str, -len, pad) means padding on the left side of the string.

In addition to the RPAD function, MySQL also provides other string processing functions, such as LPAD, TRIM, etc. These functions can be selected and applied according to actual needs.

In short, using MySQL's RPAD function to fill the right side of a string with specified characters is a very convenient and efficient way of processing. Through simple syntax, string formatting and alignment can be achieved. Developers can use it flexibly according to specific needs in daily development to improve work efficiency.

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