Re: Required distinct record with all fields

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