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我想将此 sql 查询转换为关系代数。
sql查询:
SELECT * FROM Library WHERE libName='florence'
我不知道转换为关系代数是什么意思。但在关系代数中,这句话是:
基本上,SELECT对表的操作Library,带有一个条件。
SELECT
Library
该视图与以下结果相同: