The row key is the primary key of the table and is typically a string.
行键是表的主键，通常是一个字符串。
The output is 9: the correct primary key of the sole row that matches.
输出为9：匹配的单行的正确主键。
Since the username is a primary key, there will be at most one matching row.
因为用户名(username)是主键，最多将有一行匹配。
I was bottom of the class three years in a row at primary school.
下学时，我曾经连续三年是班里的最后一名。
A primary key column is identified by a primary key symbol in its row selector.
主键列由其行选择器中的主键符号标识。
Previously in primary school gate, there is a row of tall Kapok tree.
以前在小学的大门口，有一排高大的木棉花树。
A table usually includes a primary key that ensures every row is unique.
表通常包括一个主键，该主键确保每个行都是唯一的。
Gets the row specified by the primary key value.
取得主索引键值指定的资料列。
Gets the row specified by the primary key value.
取得主索引键值指定的资料列。
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