向 MySQL 中现有 int 列的值中添加字符?
若要向现有 int 列值中添加字符,请使用 MySQL CONCAT()。我们先创建一个表 -
mysql> create table DemoTable ( Amount int ); Query OK, 0 rows affected (1.44 sec)
使用 insert 命令在表中插入一些记录 -
mysql> insert into DemoTable values(709); Query OK, 1 row affected (0.67 sec) mysql> insert into DemoTable values(34560); Query OK, 1 row affected (0.30 sec) mysql> insert into DemoTable values(90854); Query OK, 1 row affected (0.28 sec) mysql> insert into DemoTable values(3456); Query OK, 1 row affected (0.15 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 -
+--------+ | Amount | +--------+ | 709 | | 34560 | | 90854 | | 3456 | +--------+ 4 rows in set (0.00 sec)
以下是对列值添加字符的查询 -
mysql> select concat('The Product Amount is=',Amount) AS AddingCharacters from DemoTable;这将生成以下输出 -
+-----------------------------+ | AddingCharacters | +-----------------------------+ | The Product Amount is=709 | | The Product Amount is=34560 | | The Product Amount is=90854 | | The Product Amount is=3456 | +-----------------------------+ 4 rows in set (0.00 sec)
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