What is the method for choosing unique entries in PSQL depending on the most recent date/record?

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To choose unique entries in PSQL depending on the most recent date/record, you can use the following query:

SELECT DISTINCT ON (column_name) * 
FROM table_name 
ORDER BY column_name, date_field DESC;

Explanation:

• Replace "column_name" with the name of the column that contains the values you want to filter for uniqueness
• Replace "table_name" with the name of the table containing the data
• Replace "date_field" with the name of the column that contains the date or timestamp data
• The "DISTINCT ON" statement ensures that only unique entries based on the "column_name" are returned
• The "ORDER BY" statement orders the results by "columnname" and then by the "datefield" in descending order, meaning the most recent record will appear first.