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select distinct
--PostgreSQL 9.6 --'\\' is a delimiter CREATE SCHEMA erp; CREATE TABLE erp.orders( userId integer, paidat timestamp DEFAULT current_timestamp ); INSERT INTO erp.orders VALUES ('2','2017-01-01' ), ('3','2017-01-01' ), ('2','2017-01-01' ), ('2','2017-01-01' ), ('4','2017-06-07' ), ('2','2017-06-07' ), ('1','2017-06-30' ), ('1','2017-06-18' ) ; select distinct on (erp.orders.userid) erp.orders.userid, paidat from erp.orders order by erp.orders.userid, paidat asc;
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