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mysql> explain select 1 as foo union all select 1 union all select 1 union all select 1 union all select 1 union all select 1 union all select 1 union all select 1 union all select 1 union all select 1 union all select 1 union all select 1 union all select 1 union all select 1 union all select 1 union all select 1 union all select 1 union all select 1 union all select 1 union all select 1 union all select 1 union all select 1;
+----+--------------+---------------------------------------------------------------+------+---------------+------+---------+------+------+----------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+--------------+---------------------------------------------------------------+------+---------------+------+---------+------+------+----------------+
| 1 | PRIMARY | NULL | NULL | NULL | NULL | NULL | NULL | NULL | No tables used |
| 2 | UNION | NULL | NULL | NULL | NULL | NULL | NULL | NULL | No tables used |
| 3 | UNION | NULL | NULL | NULL | NULL | NULL | NULL | NULL | No tables used |
| 4 | UNION | NULL | NULL | NULL | NULL | NULL | NULL | NULL | No tables used |
| 5 | UNION | NULL | NULL | NULL | NULL | NULL | NULL | NULL | No tables used |
| 6 | UNION | NULL | NULL | NULL | NULL | NULL | NULL | NULL | No tables used |
| 7 | UNION | NULL | NULL | NULL | NULL | NULL | NULL | NULL | No tables used |
| 8 | UNION | NULL | NULL | NULL | NULL | NULL | NULL | NULL | No tables used |
| 9 | UNION | NULL | NULL | NULL | NULL | NULL | NULL | NULL | No tables used |
| 10 | UNION | NULL | NULL | NULL | NULL | NULL | NULL | NULL | No tables used |
| 11 | UNION | NULL | NULL | NULL | NULL | NULL | NULL | NULL | No tables used |
| 12 | UNION | NULL | NULL | NULL | NULL | NULL | NULL | NULL | No tables used |
| 13 | UNION | NULL | NULL | NULL | NULL | NULL | NULL | NULL | No tables used |
| 14 | UNION | NULL | NULL | NULL | NULL | NULL | NULL | NULL | No tables used |
| 15 | UNION | NULL | NULL | NULL | NULL | NULL | NULL | NULL | No tables used |
| 16 | UNION | NULL | NULL | NULL | NULL | NULL | NULL | NULL | No tables used |
| 17 | UNION | NULL | NULL | NULL | NULL | NULL | NULL | NULL | No tables used |
| 18 | UNION | NULL | NULL | NULL | NULL | NULL | NULL | NULL | No tables used |
| 19 | UNION | NULL | NULL | NULL | NULL | NULL | NULL | NULL | No tables used |
| 20 | UNION | NULL | NULL | NULL | NULL | NULL | NULL | NULL | No tables used |
| 21 | UNION | NULL | NULL | NULL | NULL | NULL | NULL | NULL | No tables used |
| 22 | UNION | NULL | NULL | NULL | NULL | NULL | NULL | NULL | No tables used |
| NULL | UNION RESULT | <union1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,...> | ALL | NULL | NULL | NULL | NULL | NULL | |
+----+--------------+---------------------------------------------------------------+------+---------------+------+---------+------+------+----------------+
23 rows in set (0.00 sec)
mysql> notee
|
