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+----+-------------+-------+-------+----------------+----------------+---------+----------------------+----------+--------------------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+-------+-------+----------------+----------------+---------+----------------------+----------+--------------------------+
| 1 | SIMPLE | A | index | index_uniqueID | index_uniqueID | 452 | NULL | 18364876 | Using index |
| 1 | SIMPLE | B | ref | index_uniqueID | index_uniqueID | 453 | db.a.uniqueID | 1 | Using where; Using index |
+----+-------------+-------+-------+----------------+----------------+---------+----------------------+----------+--------------------------+--+----------------+---------+----------------------+----------+--------------------------+