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SQL code:
mysql> desc student;
+-----------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-----------+-------------+------+-----+---------+-------+
| sno | varchar(20) | NO | PRI | NULL | |
| spassword | varchar(20) | NO | | NULL | |
| sname | varchar(20) | NO | | NULL | |
| ssex | varchar(10) | NO | | NULL | |
| ruxue | date | NO | | NULL | |
| class_no | varchar(20) | NO | | NULL | |
| role_no | varchar(20) | NO | | NULL | |
+-----------+-------------+------+-----+---------+-------+
7 rows in set (0.00 sec)



ͼ¶þSQL code:

mysql> select * from student;
+----------+-----------+-------+------+------------+----------+---------+
| sno | spassword | sname | s


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