view the previous version of tables

[Ankush Chawla <ankushchawla03@xxxxxxxxx>]

What is the command to view the previous version of rows (deleted or updated)

I searched and found some functions like : . But none of them are working

 SELECT * FROM page_header(get_raw_page('school',0));

SELECT * FROM heap_page_items(get_raw_page('school',0));
                                  ^

Sorry for a basic question

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Best Regards,
Ankush Chawla