Postgresql Top 1000. Selecting top n per group in postgresql for a recent project i found myself needing to get certain data out of our database. If a limit count is given no more than that many rows will be returned but possibly less if the query itself yields less rows.
On the other hand for dataorganisation 2 for the same query postgresql will need only 104 blocks. The following query illustrates the idea. The table will be owned by the user who has issued this command.
I could do something like.
Here is a solution which will return more than 10 rows if there are ties but you will get all the rows where somevaluecolumn is technically in the top 10. How to get the top 10 values in postgresql. Postgresql provides a mechanism for limiting query results using the limit and or offset sql syntax. Limit all is the same as omitting the limit clause.