what is a distance measure in a database for what's the difference between a distance measure and a record linkage measure? how to calculate a distance from a source to another is it necessary to create a distance measure why not combine fields what is meant by linkage of two records when do we need to compare two records what is the requirement of comparing fields? what type of field is used to create a distance measure? how to link two records where can data share fields? which field of a string is shared with the other string? how to use the distance and distance measures what is the record linkage in math do two records have to be compared is it necessary to create a distance measure for a data source what is the requirement of a record linkage what is the difference between a string and a record do sources share all fields what is the difference between a string of two records and a string of two records