以下为句子列表：
英文: 1 Base cardinality is the number of rows in a base table.
中文: 基本的行集数是一个表的行数。
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英文: 3 Join cardinality is the number of rows produced when two row sets are joined together.
中文: 连接行集数是两个行集被连接在一起时产生的行集数。
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英文: Belongs to a database; stores any number of rows of data which conform to the structure described by a column set.
中文: 表属于某个数据库；数据按行进行存储，其属性以列描述。
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英文: In a quick test on a table with 100,000 rows loaded using a sequence, a normal index was used for most queries returning up to 30 rows, as was the reverse key index, however, when the number of rows went up to 1,000,000 the reverse key index was never use
中文: 在一个用一个序列载入并含100,000行的表上做一个快速的测试，分别用普通索引和逆序索引查询并返回30行数据，当行数增长到1,000,000，将不再使用逆序索引而是每次使用全表扫描。
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英文: The mysql_num_rows() function returns the number of rows in a recordset.
中文: 函数的作用是：取得结果集中行的数目。
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