语法1：(不导入数据)
CREATE TABLE new_tbl LIKE orig_tbl;
这种语法，将从源表赋值列名、数据类型、大小、非空约束以及索引。而源表的内容以及其他约束不会复制，新表是一张空表
mysql> create table copy_teams like TEAMS;
Query OK, 0 rows affected (0.03 sec)
mysql> desc copy_teams;
+----------+---------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+----------+---------+------+-----+---------+-------+
| TEAMNO | int(11) | NO | PRI | NULL | |
| PLAYERNO | int(11) | NO | | NULL | |
| DIVISION | char(6) | NO | | NULL | |
+----------+---------+------+-----+---------+-------+
3 rows in set (0.00 sec)
mysql> desc TEAMS;
+----------+---------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+----------+---------+------+-----+---------+-------+
| TEAMNO | int(11) | NO | PRI | NULL | |
| PLAYERNO | int(11) | NO | | NULL | |
| DIVISION | char(6) | NO | | NULL | |
+----------+---------+------+-----+---------+-------+
3 rows in set (0.00 sec)
mysql> select * from copy_teams;
Empty set (0.00 sec)
语法2：(在建表同时也导入数据)
CREATE TABLE new_tbl [AS] SELECT {*|column,…} FROM orig_tbl; -------select子句也可以从多个表中查询不同的列(可以非常复杂，例如多表连接)
1、新表的结构由select列表决定。同时把查询返回的结果集中的行插入到目标表中。这种语法只能把非空约束带入到新表中。也不会复制索引
mysql> create table copy_teams as select * from TEAMS;
Query OK, 2 rows affected (0.04 sec)
Records: 2 Duplicates: 0 Warnings: 0
mysql> select * from copy_teams;
+--------+----------+----------+
| TEAMNO | PLAYERNO | DIVISION |
+--------+----------+----------+
| 1 | 6 | first |
| 2 | 27 | second |
+--------+----------+----------+
2 rows in set (0.00 sec)
mysql> desc copy_teams;
+----------+---------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+----------+---------+------+-----+---------+-------+
| TEAMNO | int(11) | NO | | NULL | |
| PLAYERNO | int(11) | NO | | NULL | |
| DIVISION | char(6) | NO | | NULL | |
+----------+---------+------+-----+---------+-------+
3 rows in set (0.00 sec)
mysql> desc TEAMS;
+----------+---------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+----------+---------+------+-----+---------+-------+
| TEAMNO | int(11) | NO | PRI | NULL | |
| PLAYERNO | int(11) | NO | | NULL | |
| DIVISION | char(6) | NO | | NULL | |
+----------+---------+------+-----+---------+-------+
3 rows in set (0.00 sec)
2、如果在表名后面指定了列名(和原始表中的列名相同)，则可以改变列的大小和非空约束
mysql> desc TEAMS;
+----------+---------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+----------+---------+------+-----+---------+-------+
| TEAMNO | int(11) | NO | PRI | NULL | |
| PLAYERNO | int(11) | NO | | NULL | |
| DIVISION | char(6) | NO | | NULL | |
+----------+---------+------+-----+---------+-------+
3 rows in set (0.00 sec)
mysql> create table teams_bak(TEAMNO int(10),PLAYERNO int(10), DIVISION char(10)) as select * from TEAMS;
Query OK, 2 rows affected (0.06 sec)
Records: 2 Duplicates: 0 Warnings: 0
mysql> desc teams_bak;
+----------+----------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+----------+----------+------+-----+---------+-------+
| TEAMNO | int(10) | YES | | NULL | |
| PLAYERNO | int(10) | YES | | NULL | |
| DIVISION | char(10) | YES | | NULL | |
+----------+----------+------+-----+---------+-------+
3、如果想要控制表的列名，则在select查询中使用列别名
mysql> create table teams_bak as select TEAMNO 队号,PLAYERNO 球员编号,DIVISION 分级 from TEAMS;
Query OK, 2 rows affected (0.03 sec)
Records: 2 Duplicates: 0 Warnings: 0
mysql> select * from teams_bak;
+--------+--------------+--------+
| 队号 | 球员编号 | 分级 |
+--------+--------------+--------+
| 1 | 6 | first |
| 2 | 27 | second |
+--------+--------------+--------+
2 rows in set (0.00 sec)
4、如果表名后面指定的列名和原始表中列名不同，则它作为一个新的列
mysql> create table teams_bak(address varchar(10)) as select * from TEAMS;
Query OK, 2 rows affected (0.04 sec)
Records: 2 Duplicates: 0 Warnings: 0
mysql> select * from teams_bak;
+---------+--------+----------+----------+
| address | TEAMNO | PLAYERNO | DIVISION |
+---------+--------+----------+----------+
| NULL | 1 | 6 | first |
| NULL | 2 | 27 | second |
+---------+--------+----------+----------+