Hi All,
I am wondering about the relative performance of insert into table1 select
distinct a,b from ... and insert into table1 select a,b from ... group by
a,b when querying tables of different sizes (10K, 100K, 1s, 10s, 100s of
millions of rows).
The distinct way tends to sort/unique and
Shawn,
I can also change the schema to a certain extent, so would it be worthwhile
to put indices on the queried tables (or refactor them) hoping the distinct
does an index scan instead of sort... would the query planner take
advantage of that?
Use the GROUP BY, with an index on the grouped
