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Rule 2: Access rows by content only rule - we can only retrieve rows/columns by their content (attribute values that exist), i.e., there is no order defined for the rows or columns
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Example: you cannot issue the query 'get the 2nd row in the person_info_table',
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or 'get the 1st column in all the rows of phone_list_table'.
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You can only do 'get the row from person_info_table whose pid equals to 2 ',
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or 'get the column values of all the rows in phone_list_table where the column is named as phone no '
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