如何使用MySQL LIKE从第一个表创建新表?
让我们首先创建一个表-
create table DemoTable1(
EmployeeId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
EmployeeName varchar(50)
);
使用插入命令在表中插入一些记录-
insert into DemoTable1(EmployeeName) values('Tom');insert into DemoTable1(EmployeeName) values('Mike');
insert into DemoTable1(EmployeeName) values('Emma');
insert into DemoTable1(EmployeeName) values('Sam');
使用select语句显示表中的所有记录:
select *from DemoTable1;
这将产生以下输出-
+------------+--------------+| EmployeeId | EmployeeName |
+------------+--------------+
| 1 | Tom |
| 2 | Mike |
| 3 | Emma |
| 4 | Sam |
+------------+--------------+
4 rows in set (0.00 sec)
以下是在MySQL中使用LIKE从另一个表创建新表的查询-
create table DemoTable2 LIKE DemoTable1;
让我们检查表的描述-
desc DemoTable2;
这将产生以下输出-
+--------------+-------------+------+-----+---------+----------------+| Field | Type | Null | Key | Default | Extra |
+--------------+-------------+------+-----+---------+----------------+
| EmployeeId | int(11) | NO | PRI | NULL | auto_increment |
| EmployeeName | varchar(50) | YES | | NULL | |
+--------------+-------------+------+-----+---------+----------------+
2 rows in set (0.00 sec)
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