Untitled

postgresql fetch 100 random rows
SELECT "Products"."Id"
      , "Products"."Title"
      , "Products"."ThumbHeight"
      , "Products"."LargeImageWidth"
      , "Products"."LargeImageHeight"
      , "Products"."Url"
      , "Products"."BrowseNodeId"
FROM "Products"
WHERE  "Products"."Id" = ANY(ARRAY(SELECT (random()*2233071)::int
                FROM generate_series(1, 100)));

--------------------------------------------------------------------------------
 Bitmap Heap Scan on "Products"  (cost=60.48..100.46 rows=10 width=268)
   Recheck Cond: ("Id" = ANY ($0))
   InitPlan 1 (returns $0)
     ->  Function Scan on generate_series  (cost=0.00..17.50 rows=1000 width=0)
   ->  Bitmap Index Scan on "Products_pkey"  (cost=0.00..42.97 rows=10 width=0)
     Index Cond: ("Id" = ANY ($0))

Bitmap Heap Scan on "Products"  (cost=60.48..100.46 rows=10 width=268) (actual time=77.702..80.944 rows=100 loops=1)
   Recheck Cond: ("Id" = ANY ($0))
   InitPlan 1 (returns $0)
     ->  Function Scan on generate_series  (cost=0.00..17.50 rows=1000 width=0) (actual time=0.097..0.348 rows=100 loops=1)
   ->  Bitmap Index Scan on "Products_pkey"  (cost=0.00..42.97 rows=10 width=0) (actual time=77.601..77.601 rows=104 loops=1)
         Index Cond: ("Id" = ANY ($0))
 Total runtime: 81.409 ms

SELECT "Products"."Id"
      , "Products"."Title"
      , "Products"."ThumbHeight"
      , "Products"."LargeImageWidth"
      , "Products"."LargeImageHeight"
      , "Products"."Url"
      , "Products"."BrowseNodeId"
FROM "Products"
ORDER BY random()
LIMIT 100

create table RandProducts as select * from "Products" order by random();
alter table RandProducts add column RandId serial8;
create index on RandProducts(randid);

select * from Products where RandId between 8000 and 8100;