MySQL的串聯由點

Question

最後一個項目，我有表Orders

我想

select (OrderName) Values Concatenated by (dash) While last OrderName Concatenated by (Dot) 

我用下面的：SELECT CONCAT(OrderName , ' - ') AS 'Name' FROM Orders

例子：

order1 - order2 - order3 . 

Answer 1

只需使用GROUP_CONCAT

SELECT CONCAT (SUBSTRING(`Name`, 1, CHAR_LENGTH(`Name`) - 2), 
       ' . ') as `Name` 
FROM (
      SELECT GROUP_CONCAT(OrderName, ' - ') AS `Name` 
      FROM Orders 
    ) T