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Developer-C 11.1
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create table test (data varchar(50))
insert into test values ('John Doe; Australia; 10 Main Road Sydney'), ('Jane Doe; England; 10 Main Road London'), ('Jill Doe; Australia; 45 Big Street; Sydney')
SELECT COUNT(DISTINCT SUBSTRING_INDEX(SUBSTRING_INDEX(data, ';', 2), ';', -1)) FROM test
COUNT(DISTINCT SUBSTRING_INDEX(SUBSTRING_INDEX(data, ';', 2), ';', -1))
2