mysql> show columns from metadata;
+---------------------+-------------------------------------+------+-----+---------+----------------
+
| Field               | Type                                | Null | Key | Default | Extra          
|
+---------------------+-------------------------------------+------+-----+---------+----------------
+
| serial_num          | int(11)                             |      | PRI | NULL    | auto_increment 
|
| instrument          | varchar(20)                         | YES  |     | NULL    |                
|
| calib_type          | varchar(40)                         | YES  |     | NULL    |                
|
| calib_type_num      | int(11)                             | YES  |     | NULL    |                
|
| data_format         | varchar(20)                         |      |     |         |                
|
| format_version      | varchar(20)                         | YES  |     | NULL    |                
|
| data_id             | varchar(40)                         | YES  |     | NULL    |                
|
| data_size           | int(11)                             | YES  |     | NULL    |                
|
| validity_start_time | datetime                            | YES  |     | NULL    |                
|
| validity_end_time   | datetime                            | YES  |     | NULL    |                
|
| proc_time           | datetime                            | YES  |     | NULL    |                
|
| proc_level          | enum('TEST','DEVELOPMENT',          | YES  |     | NULL    |                
|                     |      'PRODUCTION','SUPERSEDED')     |                                       
|
| calib_status        | enum('OK','INCOMPLETE','ABORTED')   | YES  |     | NULL    |                
|
| creator             | varchar(40)                         | YES  |     | NULL    |                
|
| input_desc          | varchar(255)                        | YES  |     | NULL    |                
|
| calib_file_name     | varchar(255)                        |      |     |         |                
|
| comments            | varchar(255)                        | YES  |     | NULL    |                
|
+---------------------+-------------------------------------+------+-----+---------+----------------
+
17 rows in set (0.00 sec)