问题
I don't understand how I could get a result of 4 for difference on the following:
col_a col_b
201 E. Rudisill 2535 E 10th St.
6039 Bunt Drive 408 W. Petit Ave.
difference(upper(a), upper(b)) returned 4 for both rows.
How is this possible? They do not sound anything alike?
回答1:
SOUNDEX converts an alphanumeric string to a four-character code that is based on how the string sounds when spoken. May be the above string starts with numbers the soundex() return '0000'.
Similar Question : Soundex with numbers as String parameter
来源：https://stackoverflow.com/questions/55787592/difference-function