如何在 MySQL 中选择 * 并重命名列?
mysqlmysqli database更新于 2025/9/13 15:08:17
首先我们创建一个表 −
mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Name varchar(20), Age int ); Query OK, 0 rows affected (1.15 sec)
使用 insert 命令在表中插入记录 −
mysql> insert into DemoTable(Name,Age) values('John',21);
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable(Name,Age) values('Carol',24);
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable(Name,Age) values('David',22);
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable(Name,Age) values('Sam',23);
Query OK, 1 row affected (0.23 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 | Age | +----+-------+------+ | 1 | John | 21 | | 2 | Carol | 24 | | 3 | David | 22 | | 4 | Sam | 23 | +----+-------+------+ 4 rows in set (0.00 sec)
以下是 SELECT * 并重命名列的查询 −
mysql> select tbl.*,Name AS StudentName from DemoTable tbl;
这将产生以下输出 −
+----+-------+------+-------------+ | Id | Name | Age | StudentName | +----+-------+------+-------------+ | 1 | John | 21 | John | | 2 | Carol | 24 | Carol | | 3 | David | 22 | David | | 4 | Sam | 23 | Sam | +----+-------+------+-------------+ 4 rows in set (0.00 sec)
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mysql 参考教程 - 该教程包含有关 mysql 的更多信息:https://www.cainiaomax.com/mysql/
