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Microsoft SQL Server: Programming FAQ

User-Defined Functions

Formating Numbers via T/SQL by mrdenny
Posted: 10 Nov 03

Often I've been requested to write a SQL Script that formats the numbers into a way that is easy for people to read.  Complete with commas, and decimals.  Since SQL doesn't have a way to do this internally, I came up with this little function.  When calling the function there are two parameters that need to be passed.  The first is the number you want to convert.  The second is weather or not you want to display decimals.

The default number of decimal places to show is 2.  This can be changed in the second line as needed.  To hid decimals set the @ShowDecimal parameter to 0.  To show them, set it to 1.

To call the function you can use it like this:

select name, dbo.FormatNumber(id, 0)
from master.dbo.sysobjects

Below is the actual function.

CREATE Function FormatNumber
(@RawNumber numeric(32,2) = 0,
    @ShowDecimal as bit = 0
returns varchar(200) AS
    declare @FormattedNumber as varchar(100)
    declare @AfterDecimal as varchar(100)
    declare @i as int
    declare @j as int
    set @i = 0
    set @j = 0
    set @FormattedNumber = convert(bigint, @RawNumber)
    set @AfterDecimal = @RawNumber
    if charindex('.', @AfterDecimal) <> 0
        set @AfterDecimal = '.' + right(@AfterDecimal, len(@AfterDecimal)-charindex('.', @AfterDecimal))
        set @AfterDecimal = ''
    while @i <> len(@FormattedNumber)
        if @j = 3
            set @j = -1
            set @FormattedNumber = left(@FormattedNumber, len(@FormattedNumber)-@i) + ',' + right(@FormattedNumber, @i)
        set @j = @j + 1
        set @i = @i + 1
    if @ShowDecimal <> 0
        set @FormattedNumber =  @FormattedNumber + @AfterDecimal
    return @FormattedNumber

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