sql 如何在Mysql中连接字符串

Posted 2021-05-13

-- CONCAT()

SELECT CONCAT(column_name_or_string,column_name_or_string,...) table_name;
-- https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_concat

-- Example
SELECT CONCAT(author_fname,' ',author_lname) FROM books;

-- CONCAT_WS() 

CONCAT_WS(separator,column_name_or_string,column_name_or_string)
-- https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_concat-ws

-- Examples
SELECT CONCAT_WS(' ',author_fname,author_lname, '25 years old') FROM books;
SELECT CONCAT_WS('-',author_fname,author_lname, '25 years old') FROM books;