在使用MySQL SELECT语句时,给每个值添加一个百分比(%)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格 −
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)
使用插入命令向表格中插入一些记录 −
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语句显示表格中的所有记录 −
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)
以下是在使用MySQL SELECT语句时将百分比(%)符号添加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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