Обсуждение: Random order by but first 3
Hi, Suppose I have a column t1 for a table. Now t1 holds some numerice value for each row. Say R1 to R5 records has values forthe column t1 as : t1(2,5,8,10,32) I want the result to be printed as (10, 32, 8, 2, 5) means - Big, Biggest, small , <then any random order> Regards, Arup Rakshit
Hi,
Suppose I have a column t1 for a table. Now t1 holds some numerice value for each row. Say R1 to R5 records has values for the column t1 as :
t1(2,5,8,10,32)
I want the result to be printed as (10, 32, 8, 2, 5) means - Big, Biggest, small , <then any random order>
SELECT v FROM (SELECT *,
CASE
when row_number = 2 THEN 1.0
WHEN row_number = 1 THEN 2.0
WHEN row_number = 3 THEN 3.0
ELSE 10.0 + random()
END AS custom_rank
FROM (
SELECT *, row_number() OVER (ORDER BY v DESC)
FROM ( VALUES (1),(2),(3),(4),(5) ) val (v)
) v_rank
) custom_rank
ORDER BY custom_rank
Feel free to mix in different window functions to deal with ties and the like.
David J.