>
> I have the following sql:
>
> SELECT * from table order by dato asc limit 20 offset 0
>
>
> This gives me different rows than the 20 first rows when running the
> following sql:
>
> SELECT * from table order by dato asc
>
>
> Shouldn't the 20 first rows in the second sql statment be the same 20
> rows that is returned in the first statement
> or am I missing something?
>
Not necessarily. In your example query, if "dato" was not a unique
column, and there were some duplicates, the "top 20" values is not
a defined set. Adding the offset clause might cause a different
query plan, resulting in a different ordering of the duplicate values.