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7 lines
751 B
SQL
7 lines
751 B
SQL
explain select * from t2 LEFT JOIN t on t2.id = t.id AND 1 = 0 WHERE t2.id = 1;
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+------+-------------+-------+-------+---------------+------+---------+------+------+-------------------------+
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| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
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+------+-------------+-------+-------+---------------+------+---------+------+------+-------------------------+
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| 1 | SIMPLE | t | const | t_id | NULL | NULL | NULL | 0 | Impossible ON condition |
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| 1 | SIMPLE | t2 | ALL | NULL | NULL | NULL | NULL | 1 | Using where |
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+------+-------------+-------+-------+---------------+------+---------+------+------+-------------------------+ |