使用 MySQL SELECT 语句时,在每个值末尾添加百分比 (%) 符号
要添加百分号符号,请使用 CONCAT() 函数。让我们先创建一个表 -
mysql> create table DemoTable ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentName varchar(100), StudentScore int ); Query OK, 0 rows affected (0.68 sec)
使用 insert 命令在表中插入一些记录 -
mysql> insert into DemoTable(StudentName,StudentScore) values('John',65); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable(StudentName,StudentScore) values('Chris',98); Query OK, 1 row affected (0.30 sec) mysql> insert into DemoTable(StudentName,StudentScore) values('Robert',91); Query OK, 1 row affected (0.09 sec)
使用 select 语句显示表中的所有记录 -
mysql> select *from DemoTable;
这将产生以下输出 -
+-----------+-------------+--------------+ | StudentId | StudentName | StudentScore | +-----------+-------------+--------------+ | 1 | John | 65 | | 2 | Chris | 98 | | 3 | Robert | 91 | +-----------+-------------+--------------+ 3 rows in set (0.00 sec)
以下是对使用 MySQL SELECT 语句添加百分比 (%) 符号到每个值末尾的查询 -
mysql> select StudentId,StudentName,concat(StudentScore,'%') AS StudentScore from DemoTable;
这将产生以下输出 -
+-----------+-------------+--------------+ | StudentId | StudentName | StudentScore | +-----------+-------------+--------------+ | 1 | John | 65% | | 2 | Chris | 98% | | 3 | Robert | 91% | +-----------+-------------+--------------+ 3 rows in set (0.00 sec)
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