On 25/04/2024 15:58, Sunil Jadhav wrote:
Hello team,
we have table & its having 10 diff columns.
1) we need to fetch distinct records from 1 column
suppose earlier we have 500 records after
distinct we have 150 records only -->> we can used simply distinct
function with column name
will get the 150 unique data/records BUT.... based on output means 150
records
2) how we can retrieve all other filed information like how we can
achieve through SQL.
If I understand you correctly, you want to get distinct values of one
column with the LATEST data for the other columns from those records
So, if you have a table like
CREATE TABLE mytable (id BIGSERIAL PRIMARY KEY, val VARCHAR, datetime
TIMESTAMP WITH TIME ZONE);
and you want to get all the data for each distinct value of 'val', you
could do
SELECT * FROM mytable INNER JOIN (SELECT MAX(id) AS id FROM mytable
GROUP BY val) USING (id);
The 'GROUP BY' gives you the distinct values; the MAX(id) gives you the
IDs of the latest records containing those distinct values, so the JOIN
just gives you those latest records
Paul
