Dapatkan elemen berbeda dalam tabel PSQL
postgres=# select distinct on (col1) col1,col2,col3 from test order by col1;
col1 | col2 | col3
------+------+------------
1 | abc | 2015-09-10
2 | xyz | 2015-09-13
3 | tcs | 2015-01-15
(3 rows)
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