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CREATE TABLE orders( Date Date, Name varchar(10) ); INSERT INTO orders (Name,Date) VALUES ('bob', '2014-08-10'), ('sue', '2014-08-10'), ('bob', '2014-08-11'), ('mike', '2014-08-11'), ('bob', '2014-08-12'), ('mike', '2014-08-12'), ('bob', '2014-08-05'), ('bob', '2014-08-06');
CREATE TABLE
INSERT 0 8
SELECT t.Name,COUNT(*) as frequency FROM (SELECT o.*, row_number() OVER (PARTITION BY Name ORDER BY Date) as seqnum FROM orders o ) t GROUP BY Name, date - seqnum * interval '1 day'
name
frequency
sue
1
bob
3
mike
2
bob
2
SELECT 4