CREATE TABLE t2 (
  DT date,
  ID integer
);

INSERT INTO t2 (DT, ID) values ('2015/08/01', 1);
INSERT INTO t2 (DT, ID) values ('2015/08/01', 2);
INSERT INTO t2 (DT, ID) values ('2015/08/01', 1);
INSERT INTO t2 (DT, ID) values ('2015/08/02', 1);
INSERT INTO t2 (DT, ID) values ('2015/08/02', 2);
INSERT INTO t2 (DT, ID) values ('2015/08/02', 2);
INSERT INTO t2 (DT, ID) values ('2015/08/03', 3);
INSERT INTO t2 (DT, ID) values ('2015/08/04', 4);
INSERT INTO t2 (DT, ID) values ('2015/08/04', 1);
INSERT INTO t2 (DT, ID) values ('2015/08/05', 1);

select * from t2;

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