006--Explain實戰詳解：table分析

1.table展現數據來自哪一張表 mysql> EXPLAIN SELECT t1.id from t1,t3,t2 where t1.id = t3.id and t3.id = t2.id and t2.id = 1; +----+-------------+-------+------+---------------+------+---------+------+------+----

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