在 MySQL 中将列值与单独的文本连接起来并显示在单个列中
mysqlmysqli database
首先我们创建一个表 −
mysql> create table DemoTable -> ( -> Id int, -> Name varchar(20) -> ); Query OK, 0 rows affected (0.93 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable values(101,'Chris'); Query OK, 1 row affected (0.25 sec) mysql> insert into DemoTable values(102,'David'); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable values(103,'Robert'); Query OK, 1 row affected (0.16 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 −
+------+--------+ | Id | Name | +------+--------+ | 101 | Chris | | 102 | David | | 103 | Robert | +------+--------+ 3 rows in set (0.00 sec)
以下是 MySQL 查询，用于将列值与单独的文本连接起来 −
mysql> select concat('The student id and name is= ', Id , ',' , Name, ' .') from DemoTable;
这将产生以下输出 −
+---------------------------------------------------------------+
| concat('The student id and name is= ', Id , ',' , Name, ' .') |
+---------------------------------------------------------------+
| The student id and name is= 101,Chris . |
| The student id and name is= 102,David . |
| The student id and name is= 103,Robert . |
+---------------------------------------------------------------+
3 rows in set (0.01 sec)
