SQL Server Round将5解释为更低

Question

I want to round decimals in sql server 2012 for example:

Select ROUND(1.056,2) -- returns  1.06
Select ROUND(1.055,2) -- returns  1.06
Select ROUND(1.054,2) -- returns  1.05

How can I make the second query returns 1.05 rounding the third decimal if 5 to lower?

Answer 1

Select only 2 digits from the field. This will select high number in 4th position or 5th position

 select    
 case when  right ( 'colvalue',1) >  right (SUBSTRING('colValue',1,4),1) 
 then ROUND('colvalue',2)
 else ROUND (LEFT ( 'colvalue',4) ,2) end RoundValue

Answer 2

You can use a function as third argument of round(). If the function returns 0 then the result is rounded otherwise the result is truncated.

-- Syntax for SQL Server and Azure SQL Database  
ROUND ( numeric_expression , length [ ,function ] )  

SELECT round(1.055,2,1)

Edit:

Here is a complete example...

create table test
(
    n decimal(10,7) not null
)
GO

insert into test (n)
values 
(1.050),
(1.051),
(1.052),
(1.053),
(1.054),
(1.055),
(1.056),
(1.057),
(1.058),
(1.059)
GO

select n, round(n,2,iif(n - round(n,2,1)>.005,0,1)) as rounded from test
GO

Here is the result :

n           rounded
1.0500000   1.0500000
1.0510000   1.0500000
1.0520000   1.0500000
1.0530000   1.0500000
1.0540000   1.0500000
1.0550000   1.0500000
1.0560000   1.0600000
1.0570000   1.0600000
1.0580000   1.0600000
1.0590000   1.0600000

Answer 3

You can use this. It will work for you.

DECLARE @test decimal(10,3) = 1.055
SELECT CASE WHEN round(@test,3,1) - round(@test,2,1) = 0.005 THEN round(@test,2,1) ELSE round(@test,2) END

Answer 4

I would go with simple:

DECLARE @test nvarchar(10)
DECLARE @test_string nvarchar(10)

SET @test_string='1.055'
-- SET @test_string='1.056' -- is here to test
SET @test = SUBSTRING(@test_string,5,5)


IF @test=5
BEGIN
   SELECT ROUND (LEFT(@test_string,4),2)
END
ELSE
BEGIN
  SELECT ROUND (@test_string,2)
END

Answer 5

Try casting the rounded value:

Select CAST(ROUND(1.056,2) AS NUMERIC(10,2)) -- returns  1.06
Select CAST(ROUND(1.055,2) AS NUMERIC(10,2))  -- returns  1.06
Select CAST(ROUND(1.054,2) AS NUMERIC(10,2))  -- returns  1.05