html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,issue,performed_via_github_app
https://github.com/simonw/datasette/issues/916#issuecomment-812742462,https://api.github.com/repos/simonw/datasette/issues/916,812742462,MDEyOklzc3VlQ29tbWVudDgxMjc0MjQ2Mg==,1111743,2021-04-02T22:37:27Z,2021-04-02T22:37:27Z,NONE,"Yes, this would be nice!

I using Datasette v0.56 and don't see a previous page button.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",672421411,
https://github.com/simonw/datasette/issues/916#issuecomment-812804998,https://api.github.com/repos/simonw/datasette/issues/916,812804998,MDEyOklzc3VlQ29tbWVudDgxMjgwNDk5OA==,9599,2021-04-03T03:47:45Z,2021-04-03T03:47:45Z,OWNER,I found one example of an implementation of reversed keyset pagination here: https://github.com/tvainika/objection-keyset-pagination/blob/cb21a493c96daa6e63c302efae6718d09aa11661/index.js#L74-L79,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",672421411,
https://github.com/simonw/datasette/issues/916#issuecomment-812940457,https://api.github.com/repos/simonw/datasette/issues/916,812940457,MDEyOklzc3VlQ29tbWVudDgxMjk0MDQ1Nw==,9599,2021-04-03T23:28:40Z,2021-04-03T23:28:40Z,OWNER,"I think my ideal implementation for this would be to reverse the order, grab the previous page-size-plus-one items, then return a `?_next=x` token that would provide the previous page sorted back in the expected default order.

The alternative would be to have a `?_previous=x` token which can be used to paginate backwards in reverse order, but I think this would be confusing as it would result in ""hit next page, then hit previous page"" returning you to a new state which features rows in the reverse order.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",672421411,
https://github.com/simonw/datasette/issues/916#issuecomment-812940907,https://api.github.com/repos/simonw/datasette/issues/916,812940907,MDEyOklzc3VlQ29tbWVudDgxMjk0MDkwNw==,9599,2021-04-03T23:33:41Z,2021-04-03T23:33:41Z,OWNER,"Let's figure out the SQL for this. The most complex case is probably this one: https://latest.datasette.io/fixtures/compound_three_primary_keys?_next=a%2Ch%2Cr

Here's the SQL for that page: https://latest.datasette.io/fixtures?sql=select+pk1%2C+pk2%2C+pk3%2C+content+from+compound_three_primary_keys+where+%28%28pk1+%3E+%3Ap0%29%0A++or%0A%28pk1+%3D+%3Ap0+and+pk2+%3E+%3Ap1%29%0A++or%0A%28pk1+%3D+%3Ap0+and+pk2+%3D+%3Ap1+and+pk3+%3E+%3Ap2%29%29+order+by+pk1%2C+pk2%2C+pk3+limit+101&p0=a&p1=h&p2=r

```sql
select pk1, pk2, pk3, content from compound_three_primary_keys where ((pk1 > :p0)
  or
(pk1 = :p0 and pk2 > :p1)
  or
(pk1 = :p0 and pk2 = :p1 and pk3 > :p2)) order by pk1, pk2, pk3 limit 101
```
Where `p0` is `a`, `p1` is `h` and `p2` is `r`.

Given the above, how would I figure out the correct previous link? It should be https://latest.datasette.io/fixtures/compound_three_primary_keys?_next=a%2Cd%2Cv - `a`, `d`, `v`.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",672421411,
https://github.com/simonw/datasette/issues/916#issuecomment-812941112,https://api.github.com/repos/simonw/datasette/issues/916,812941112,MDEyOklzc3VlQ29tbWVudDgxMjk0MTExMg==,9599,2021-04-03T23:35:55Z,2021-04-03T23:35:55Z,OWNER,"I tried flipping the direction of the sort and the comparison operators and got this: https://latest.datasette.io/fixtures?sql=select+pk1%2C+pk2%2C+pk3%2C+content+from+compound_three_primary_keys+where+%28%28pk1+%3C+%3Ap0%29%0D%0A++or%0D%0A%28pk1+%3D+%3Ap0+and+pk2+%3C+%3Ap1%29%0D%0A++or%0D%0A%28pk1+%3D+%3Ap0+and+pk2+%3D+%3Ap1+and+pk3+%3C+%3Ap2%29%29+order+by+pk1+desc%2C+pk2+desc%2C+pk3+desc+limit+1+offset+99&p0=a&p1=h&p2=r

```sql
select pk1, pk2, pk3, content from compound_three_primary_keys where ((pk1 < :p0)
  or
(pk1 = :p0 and pk2 < :p1)
  or
(pk1 = :p0 and pk2 = :p1 and pk3 < :p2)) order by pk1 desc, pk2 desc, pk3 desc limit 1 offset 99
```
Which returned `a-d-v` as desired. I messed around with it to find the `limit 1 offset 99` values.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",672421411,
https://github.com/simonw/datasette/issues/916#issuecomment-812941340,https://api.github.com/repos/simonw/datasette/issues/916,812941340,MDEyOklzc3VlQ29tbWVudDgxMjk0MTM0MA==,9599,2021-04-03T23:38:37Z,2021-04-03T23:38:37Z,OWNER,"Same query again with `a, d, v` returns 0 results, which is also as we would want: it signifies that we are back to the very first page: https://latest.datasette.io/fixtures?sql=select+pk1%2C+pk2%2C+pk3%2C+content+from+compound_three_primary_keys+where+%28%28pk1+%3C+%3Ap0%29%0D%0A++or%0D%0A%28pk1+%3D+%3Ap0+and+pk2+%3C+%3Ap1%29%0D%0A++or%0D%0A%28pk1+%3D+%3Ap0+and+pk2+%3D+%3Ap1+and+pk3+%3C+%3Ap2%29%29+order+by+pk1+desc%2C+pk2+desc%2C+pk3+desc+limit+1+offset+99&p0=a&p1=d&p2=v","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",672421411,
https://github.com/simonw/datasette/issues/916#issuecomment-812941818,https://api.github.com/repos/simonw/datasette/issues/916,812941818,MDEyOklzc3VlQ29tbWVudDgxMjk0MTgxOA==,9599,2021-04-03T23:43:11Z,2021-04-03T23:43:11Z,OWNER,"Relevant code is some of the most complex in all of Datasette.

https://github.com/simonw/datasette/blob/0a7621f96f8ad14da17e7172e8a7bce24ef78966/datasette/views/table.py#L530-L594

And

https://github.com/simonw/datasette/blob/0a7621f96f8ad14da17e7172e8a7bce24ef78966/datasette/views/table.py#L743-L771

I'll need to think hard about how to refactor this out into something more understandable before implementing previous links.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",672421411,