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mysql> desc NATION;
+-------------+--------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------------+--------------+------+-----+---------+-------+
| N_NATIONKEY | int(11) | NO | | NULL | |
| N_NAME | char(25) | NO | | NULL | |
| N_REGIONKEY | int(11) | NO | | NULL | |
| N_COMMENT | varchar(152) | YES | | NULL | |
+-------------+--------------+------+-----+---------+-------+
4 rows in set (0.00 sec)
mysql> insert into NATION values(1,'China',NULL,NULL);
ERROR 1048 (23000): Column 'N_REGIONKEY' cannot be null
mysql> insert into NATION values(1,'China',1,NULL);
Query OK, 1 row affected (0.00 sec)
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