方法一：CONCAT_WS

--使用CONCAT_WS連接姓名和地址，并以逗號分隔：
SELECT
CONCAT_WS(', ', first_name, middle_name, last_name, address) AS full_info
FROM person;

方法二：CONCAT 函數不帶分隔符

--使用CONCAT拼接人的姓和名 mysql gbase
SELECT
CONCAT(first_name, ' ', last_name) AS full_name
FROM person;

--使用CONCAT拼接 oracle
SELECT
CONCAT(first_name, last_name) AS full_name
FROM person;

方法三：||

--使用||分隔符 oracle
SELECT first_name || ' ' || last_name AS full_name
FROM person;