Rounding the value to the nearest 50 - sql-server

Question

I am trying to round down the value to the nearest 50.
1-50 it should round down to below 00 and when its 51-rest then it should round down to 50
ex:
245 (until 1-49) its should round down to 200
258 (from 50-99)then it should round down to 250
I tried this,its wrking good but I need smething other than case statement
#ResultAmount = ROUND(#ResultAmount, -2, 1) +
CASE WHEN RIGHT(CONVERT(INT, FLOOR(#ResultAmount)), 2) IN (00, 50)
THEN RIGHT(CONVERT(INT, FLOOR(#ResultAmount)), 2)
WHEN RIGHT(CONVERT(INT, FLOOR(#ResultAmount)), 2) BETWEEN 1 AND 49
THEN 00
WHEN RIGHT(CONVERT(INT, FLOOR(#ResultAmount)), 2) BETWEEN 51 AND 99
THEN 50
END
Thanks in advance!!!

Answer 1

This is all you need
SELECT FLOOR(#ResultAmount / 50) * 50;
e.g below
declare #ResultAmount decimal(10,2) = 249;
SELECT FLOOR(#ResultAmount / 50) * 50;
SET #ResultAmount = 250;
SELECT FLOOR(#ResultAmount / 50) * 50;
SET #ResultAmount = 200;
SELECT FLOOR(#ResultAmount / 50) * 50;
SET #ResultAmount = 199;
SELECT FLOOR(#ResultAmount / 50) * 50;

Answer 2

It sounds like numbers 0-50 get rounded up to "50", but any number larger than that should just get rounded to the nearest 50. Something like the following should work:
(CASE WHEN f1/50 < 1 THEN 1 ELSE ceiling(f1/50) END) * 50 AS rounded_to_50

Answer 3

You can simply divide the number by 50, round then multiply by 50 again, eg:
select cast(round(#i/50.0,0)*50 as int)
This will return 500 if #i is 524 but 550 if #i is 525.
You can create a function to make this easier:
create function fn_Round_By(#input int,#divider float)
returns int
as
begin
RETURN (cast(round(#input/#divider,0)*#divider as int));
end
Again, select dbo.fn_Round_By(525,50) returns 550 andselect dbo.fn_Round_By(524,50)` returns 500.
If you want values less than 50 to round up to 50, you can use a simple CASE, eg:
create function fn_Round_By(#input int,#divider float)
returns int
as
begin
RETURN (
CASE
WHEN #input <=#divider then #divider
else cast(round(#input/#divider,0)*#divider as int)
END
);
end
Rounding down is performed by the FLOOR function so a function that rounded down to a specific interval would be:
create function fn_Floor_By(#input int,#divider float)
returns int
as
begin
RETURN (cast(FLOOR(#input/#divider)*#divider as int));
end
or, preserving the logic that rounds up anything under 50:
create function fn_Floor_By(#input int,#divider float)
returns int
as
begin
RETURN (
CASE
WHEN #input <=#divider then #divider
else cast(FLOOR(#input/#divider)*#divider as int)
END
);
end

Answer 4

You can calculate modulo 50 and use this to reduce the original value
DECLARE #ResultAmount int = 243
SELECT #ResultAmount - (#ResultAmount%50)