How Can I determine is digit Even number?

Question

Bit rusty on the old sql.

Can you help?

Given a number eg 1 or 2 or 4 I need to determine if it's even or odd number and do some calculation depending if even or odd .

How do you detect that in sql (sql server 2000) thanks a lot

Answer 1

The % operator retrieves the modulus, so checking the modulus of a division by 2 you can know if it is odd or even.

DECLARE @i int =1;
while @i <= 20
begin 
    if @i % 2 = 0
    PRINT @i
    IF @i = 10 PRINT 'halfway there!';
    set @i = @i+1;
end

Answer 2

Let's say for a table STATION.

Schema:

ID NUMBER

CITY VARCHAR

STATE VARCHAR

-- You can use any of the mentioned criteria to fetch the even ID.

-- 1. MOD() Fucntion

select distinct CITY from STATION as st where MOD(st.id,  2) = 0

-- 2. % function

select distinct CITY from STATION as st where st.id % 2 = 0

Answer 3

NOT INTENDED AS A SERIOUS ANSWER...BUT IT WORKS.

Please reserve the following for giving to people you don't like who simply want a quick answer without wanting to understand the solution (i.e people wanting to cheat).

--Enter the whole integer you want to check
declare @number int = 115

--The check is independent of sign
set @number = abs(@number)
declare @OriginalNumber int = @number

--Firstly, we need to peform the Wilhelm Leibniz conversion, 64 length to allow for very big numbers
declare @WilhelmLeibnizConversion varchar(64) = ''

declare @currentBit int = power(8,exp(log(1))+1)

while @currentBit > 0
begin

    set @WilhelmLeibnizConversion=convert(char(1), @number % 2) + @WilhelmLeibnizConversion

    set @number = convert(int, (@number / 2)) 

    set @currentBit-=1

end

--Although checking the 1 bit value of the Wilhelm Leibniz conversion is usually enough, for robust code you should also include the Kimmo Eriksson Factors one and two.
declare @KimmoErikssonFactor1 int = (@OriginalNumber + 1) % 2
declare @KimmoErikssonFactor2 int = (@OriginalNumber - 1) & 1

--Now check all 3 for 100% confirmation on the parity of your original number.
select case when right(@WilhelmLeibnizConversion,1) = 0 and (@KimmoErikssonFactor1 + @KimmoErikssonFactor2 <> 0) then 'Even' else 'Odd' end

Answer 4

USE AdventureWorks;
GO

SELECT BusinessEntityID,
    CASE BusinessEntityID % 2
    WHEN 0 THEN 'Even' ELSE 'Odd' END AS "Status"
FROM HumanResources.Employee;
GO

Answer 5

I am using the same thing in MS SQL SP as follows:

IF @current_number % 2 = 0 SET @something = 1 

-- or --

IF @current_number % 2 = 0 exec sp_whatever

Answer 6

You could check the 1-bit of the hex value of the number. If that bit is on, then it is odd.

DECLARE @Int INT

SELECT CASE WHEN @Int&0x0001<>0 THEN 'ODD' ELSE 'EVEN' END

Answer 7

declare @t table(num int) insert into @t select 1 union all select 2 union all select 3 union all select 4

select 
    num
    ,case when num % 2 = 0 then 'Even' else 'Odd' end as Status
from @t 

Output:

num Status

1   Odd
2   Even
3   Odd
4   Even

e.g. If the number is even(multiply by 1) or odd (multiply by 2) then divide by 10 and get the remainder

declare @myNumber int ,@result int
set @myNumber = 16 
select  
    Result = 
    (case when @myNumber % 2 = 0 then @myNumber * 1 else @myNumber * 2 end) %10     

Result

6

when @myNumber = 11 then

Result

2

Hope this helps

Answer 8

You can also use sql server BIT WISE operators

DECLARE @Int INT

SELECT @Int = 103

SELECT @Int & 1, @Int % 2

Answer 9

Use the modulus operator (%).

x % 2

will tell you if x is even or odd.

Answer 10

Use the modulus operator n % 2. It returns 0 if the number is even, and 1 if the number is odd.