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【以下的回答经过翻译处理】 1. CREATE TABLE AS SELECT (CTAS) 查询被认为是DML查询,并根据SELECT查询扫描的数据量产生成本。 2. 运行CTAS查询创建的表不是指向原始表的指针,而是一个独立的副本,因此不涉及任何重复成本。
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