利用 MySQL 连接列值与区分文本并在单列中显示
我们首先创建一个表 -
mysql> create table DemoTable -> ( -> Id int, -> Name varchar(20) -> ); Query OK, 0 rows affected (0.93 sec)
使用插入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;
这将生成以下输出 -
+------+--------+ | Id | Name | +------+--------+ | 101 | Chris | | 102 | David | | 103 | Robert | +------+--------+ 3 rows in set (0.00 sec)
以下是使用 MySQL 查询连接带区分文本的列值 -
mysql> select concat('The student id and name is= ', Id , ',' , Name, ' .') from DemoTable;
这将生成以下输出 -
+---------------------------------------------------------------+ | 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)
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