MSSQL Float Data Problem

Sep 27, 2007

Hello,

I am connecting to MSSQL through ODBC using regular SQL commands (SQLAllocHandle, SQLConnect, SQLFetch). Sometimes when I retrieve float data from the server it gets corrupted. For instance, instead of 59.457443 I will actually get 59.45744299999998. The value that is stored in the database is 59.457443 and it is stored as a float. The code I use to retrieve the data worked OK with an Access database, the problem only appeared after switching to MSSQL. Does anybody know if it's a configuration issue? Any help would be greatly appreciated.

EoF

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MSSQL && ODBC Float Problem

Sep 27, 2007

Hi,

I am having problems using MSSQL Express with ODBC. I am trying to retrieve a float field from the MSSQL server, but the value I get is corrupted (or at least approximated wrong). For instance, the value I want to retrieve is 59.457443, but what I actually get is 59.457442999999998. This only happens if I connect through ODBC. I did some tracing with ODBC and I've noticed that it's not a problem in my code, since the wrong value is what is actually extracted from the database. Following is an extract from the log file.

a88-ec EXIT SQLGetData with return code 0 (SQL_SUCCESS) HSTMT 03C62918 UWORD 5 SWORD 1 <SQL_C_CHAR> PTR 0x0415EB30 [ 18] "59.457442999999998" SQLLEN 50 SQLLEN * 0x0415E720 (18)


I am wondering if I overlooked something configuration-wise of if this is a bug in the driver? Any help would be greatly appreciated.

EoF

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MSSQL Float Precision Problem By Using PHP Driver

Nov 13, 2007

I'm connecting MSSQL Server 2005 Express via MS Driver for PHP (CTP version October 2007) and sometimes I don't retrieve exact float values. For example, in database is 0.7 and I get 0.69999999999999996, but for 1.0 in database I get 1.0. The result is the same, if I use prepared statement (sqlsrv_conn_prepare() and sqlsrv_stmt_execute()) or directly sql_conn_execute().

The table definition is very simple:
CREATE TABLE [dbo].[test](
a float NOT NULL
);
insert into test values(0.7);
insert into test values(1.0);
insert into test values(1.1);
insert into test values(1.2);
insert into test values(1.3);
insert into test values(1.4);
insert into test values(1.5);
insert into test values(1.6);
insert into test values(1.7);
insert into test values(1.8);
insert into test values(1.9);
insert into test values(2.0);

And select command is:
select a from test;

PHP code:
$conn = sqlsrv_connect("localhostsqlexpress", array("UID" => "sa", "PWD" => "password"));
sqlsrv_conn_execute($conn, "USE dbname");
$stmt = sqlsrv_conn_execute($conn, "select a from test");

while($row = sqlsrv_stmt_fetch_array($stmt, SQLSRV_FETCH_TYPE_ARRAY))
echo $row[1]."; ";

Result:
0.69999999999999996; 1.0; 1.1000000000000001; 1.2; 1.3; 1.3999999999999999; 1.5; 1.6000000000000001; 1.7; 1.8; 1.8999999999999999; 2.0

Expected result:
0.7; 1.0; 1.1; 1.2; 1.3; 1.4; 1.5; 1.6; 1.7; 1.8; 1.9; 2.0

Running configuration:
Windows 2003 Server SP2, SQL Server 2005 Express SP2, IIS6, PHP 5.2.5 ISAPI

Thank you very much for help.
Vlasta

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Convert A Binary Float To FLOAT Datatype

Apr 9, 2007

I can't take full credit for this. I want to share this with Jeff Moden who did the important research for this calculation here.

All I did was just adapting some old code according to the mantissa finding Jeff made and optimized it a little


Some test codeDECLARE@SomeNumber FLOAT,
@BinFloat BINARY(8)

SELECT@SomeNumber = -185.6125,
@BinFloat = CAST(@SomeNumber AS BINARY(8))

SELECT@SomeNumber AS [Original],
CAST(@SomeNumber AS BINARY(8)) AS [Binary],
dbo.fnBinaryFloat2Float(CAST(@SomeNumber AS BINARY(8))) AS [Converted],
@SomeNumber - dbo.fnBinaryFloat2Float(CAST(@SomeNumber AS BINARY(8))) AS [Error]

And here is the code for the function.CREATE FUNCTION dbo.fnBinaryFloat2Float
(
@BinaryFloat BINARY(8)
)
RETURNS FLOAT
AS
BEGIN
DECLARE@Part TINYINT,
@PartValue TINYINT,
@Mask TINYINT,
@Mantissa FLOAT,
@Exponent SMALLINT,
@Bit TINYINT,
@Ln2 FLOAT,
@BigValue BIGINT

SELECT@Part = 1,
@Mantissa = 1,
@Bit = 1,
@Ln2 = LOG(2),
@BigValue = CAST(@BinaryFloat AS BIGINT),
@Exponent = (@BigValue & 0x7ff0000000000000) / EXP(52 * @Ln2)

WHILE @Part <= 8
BEGIN
SELECT@Part = @Part + 1,
@PartValue = CAST(SUBSTRING(@BinaryFloat, @Part, 1) AS TINYINT),
@Mask =CASE WHEN @Part = 2 THEN 8 ELSE 128 END

WHILE @Mask > 0
BEGIN
IF @PartValue & @Mask > 0
SET @Mantissa = @Mantissa + EXP(-@Bit * @Ln2)

SELECT@Bit = @Bit + 1,
@Mask = @Mask / 2
END
END

RETURNSIGN(@BigValue) * @Mantissa * POWER(CAST(2 AS FLOAT), @Exponent - 1023)
END
Thanks again Jeff!


Peter Larsson
Helsingborg, Sweden

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Hi all,
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I am using SQL Server 2000, VS 2003
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Hi All,

Am I missing something or is there something odd with float data types. i know that float is not the most precise definition but i came across something really odd today.

first let me define the scenario.

this is sql server 2005, standard edition build 3042.

I have a table defined as


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Error converting data type varchar to float.


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Error Converting Data Type Varchar To Float.

Mar 25, 2008

hello anyone... i got this message "Error converting data type varchar to float" when i was trying to insert values into table using instead of trigger...

below is my table ClimateData

quote:USE [PVMC Database]
GO
/****** Object: Table [dbo].[ClimateData] Script Date: 03/26/2008 03:04:44 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[ClimateData](
[Climate_application_id] [uniqueidentifier] NOT NULL CONSTRAINT [DF_ClimateData_Climate_application_id] DEFAULT (newid()),
[Latitude] [float] NULL,
[Longitude] [float] NULL,
[Altitude] [varchar](50) COLLATE Latin1_General_CI_AI NULL,
[Climate_type] [varchar](100) COLLATE Latin1_General_CI_AI NULL,
[PV_application_id] [uniqueidentifier] NULL,
CONSTRAINT [PK_ClimateData_1] PRIMARY KEY CLUSTERED
(
[Climate_application_id] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]

GO
SET ANSI_PADDING OFF
GO
USE [PVMC Database]
GO
ALTER TABLE [dbo].[ClimateData] WITH CHECK ADD CONSTRAINT [FK_ClimateData_Photovoltaic] FOREIGN KEY([PV_application_id])
REFERENCES [dbo].[Photovoltaic] ([PV_application_id])
ON UPDATE CASCADE
ON DELETE CASCADE


Below is photovoltaic table

quote:USE [PVMC Database]
GO
/****** Object: Table [dbo].[Photovoltaic] Script Date: 03/26/2008 03:06:58 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[Photovoltaic](
[PV_application_id] [uniqueidentifier] NOT NULL CONSTRAINT [DF_Photovoltaic_PV_application_id] DEFAULT (newid()),
[PV_site] [varchar](50) COLLATE Latin1_General_CI_AI NULL,
[PV_state] [varchar](50) COLLATE Latin1_General_CI_AI NULL,
[PV_type_of_system] [varchar](50) COLLATE Latin1_General_CI_AI NULL,
[PV_nominal_power] [float] NULL,
[PV_module] [varchar](150) COLLATE Latin1_General_CI_AI NULL,
[PV_mounting] [varchar](50) COLLATE Latin1_General_CI_AI NULL,
[PV_building_type] [varchar](50) COLLATE Latin1_General_CI_AI NULL,
[PV_topology] [varchar](50) COLLATE Latin1_General_CI_AI NULL,
[PV_new_or_retrofit] [varchar](50) COLLATE Latin1_General_CI_AI NULL,
[PV_period_of_design] [varchar](50) COLLATE Latin1_General_CI_AI NULL,
[PV_period_of_construction] [varchar](50) COLLATE Latin1_General_CI_AI NULL,
[PV_commissioning_date] [datetime] NULL CONSTRAINT [DF_Photovoltaic_PV_commissioning_date] DEFAULT (getdate()),
[PV_site_photo] [varbinary](max) NULL,
[PV_peak_nominal_rating] [float] NULL,
[User_application_id] [uniqueidentifier] NULL,
[Org_application_id] [uniqueidentifier] NULL,
CONSTRAINT [PK_Photovoltaic_1] PRIMARY KEY CLUSTERED
(
[PV_application_id] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]

GO
SET ANSI_PADDING OFF
GO
USE [PVMC Database]
GO
ALTER TABLE [dbo].[Photovoltaic] WITH CHECK ADD CONSTRAINT [FK_Photovoltaic_OrganizationDetail] FOREIGN KEY([Org_application_id])
REFERENCES [dbo].[OrganizationDetail] ([Org_application_id])
ON UPDATE CASCADE
ON DELETE CASCADE
GO
ALTER TABLE [dbo].[Photovoltaic] WITH CHECK ADD CONSTRAINT [FK_Photovoltaic_Users] FOREIGN KEY([User_application_id])
REFERENCES [dbo].[Users] ([User_application_id])
ON UPDATE CASCADE
ON DELETE CASCADE

Below also my command for instead of trigger


quote:set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go


CREATE trigger [tr_v_PhotovoltaicClimateData] on [dbo].[v_PhotovoltaicClimateData] instead of insert as
BEGIN

insert Photovoltaic (PV_site, PV_state, PV_type_of_system, PV_nominal_power, PV_module,
PV_mounting)
select distinct inserted.PV_site, inserted.PV_state, inserted.PV_type_of_system,
inserted.PV_nominal_power, inserted.PV_module, inserted.PV_mounting
from inserted left join Photovoltaic on inserted.PV_site = Photovoltaic.PV_site
and inserted.PV_state = Photovoltaic.PV_state
and inserted.PV_type_of_system = Photovoltaic.PV_type_of_system
and inserted.PV_nominal_power = Photovoltaic.PV_nominal_power
and inserted.PV_nominal_power = Photovoltaic.PV_module
and inserted.PV_nominal_power = Photovoltaic.PV_mounting
where Photovoltaic.PV_site IS NULL /*** Exclude Organization Detail already in the table ***/

insert ClimateData (Latitude, Longitude, Altitude, Climate_type, PV_application_id)
select distinct inserted.Latitude, inserted.Longitude, inserted.Altitude, inserted.Climate_type,
Photovoltaic.PV_application_id
from inserted inner join Photovoltaic on inserted.PV_site = Photovoltaic.PV_site
left join ClimateData on inserted.Latitude = ClimateData.Latitude
and inserted.Longitude = ClimateData.Longitude
and inserted.Altitude = ClimateData.Altitude
and inserted.Climate_type = ClimateData.Climate_type
where ClimateData.Latitude IS NULL /*** Exclude Organization Types already in the table ***/

END -- trigger def




and finally, i hav tried using this command to insert into table v_PhotovoltaicClimateData.. this is the command to insert

quote:insert into v_PhotovoltaicClimateData(PV_site, PV_state, PV_type_of_system, PV_nominal_power,
PV_module, PV_mounting, Latitude, Longitude, Altitude, Climate_type)
values ('CETDEM', 'Sequ Inspection', 'Cheras', 34.44, 'ew', 'ewew',
34343.44, 323.32, 'ewew', 'ewewe')

and i got this error...

quote:Msg 8114, Level 16, State 5, Procedure tr_v_PhotovoltaicClimateData, Line 6
Error converting data type varchar to float.



so anyone... plzz help me...

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Error Converting Data Type Varchar To Float

Mar 28, 2008

Hello everyone... i have some problem with instead of trigger... after insert values into v_PhotovoltaicClimateData, i got this error, Msg 8114, Level 16, State 5, Procedure tr_v_PhotovoltaicClimateData, Line 6
Error converting data type varchar to float.

below is my DDL for Photovoltaic table

quote:CREATE TABLE [dbo].[Photovoltaic](
[PV_application_id] [uniqueidentifier] NOT NULL CONSTRAINT [DF_Photovoltaic_PV_application_id] DEFAULT (newid()),
[PV_site] [varchar](50) COLLATE Latin1_General_CI_AI NULL,
[PV_state] [varchar](50) COLLATE Latin1_General_CI_AI NULL,
[PV_type_of_system] [varchar](50) COLLATE Latin1_General_CI_AI NULL,
[PV_nominal_power] [float] NULL,
[PV_module] [varchar](150) COLLATE Latin1_General_CI_AI NULL,
[PV_mounting] [varchar](50) COLLATE Latin1_General_CI_AI NULL,
[PV_building_type] [varchar](50) COLLATE Latin1_General_CI_AI NULL,
[PV_topology] [varchar](50) COLLATE Latin1_General_CI_AI NULL,
[PV_new_or_retrofit] [varchar](50) COLLATE Latin1_General_CI_AI NULL,
[PV_period_of_design] [varchar](50) COLLATE Latin1_General_CI_AI NULL,
[PV_period_of_construction] [varchar](50) COLLATE Latin1_General_CI_AI NULL,
[PV_commissioning_date] [datetime] NULL CONSTRAINT [DF_Photovoltaic_PV_commissioning_date] DEFAULT (getdate()),
[PV_site_photo] [varbinary](max) NULL,
[PV_peak_nominal_rating] [float] NULL,
[User_application_id] [uniqueidentifier] NULL,
[Org_application_id] [uniqueidentifier] NULL,
CONSTRAINT [PK_Photovoltaic_1] PRIMARY KEY CLUSTERED
(
[PV_application_id] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]

Below is my DDL for ClimateData table

quote:CREATE TABLE [dbo].[ClimateData](
[Climate_application_id] [uniqueidentifier] NOT NULL CONSTRAINT [DF_ClimateData_Climate_application_id] DEFAULT (newid()),
[Latitude] [float] NULL,
[Longitude] [float] NULL,
[Altitude] [varchar](50) COLLATE Latin1_General_CI_AI NULL,
[Climate_type] [varchar](100) COLLATE Latin1_General_CI_AI NULL,
[PV_application_id] [uniqueidentifier] NULL,
CONSTRAINT [PK_ClimateData_1] PRIMARY KEY CLUSTERED
(
[Climate_application_id] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]



below is my v_PhotovoltaicClimateData

quote:CREATE VIEW [dbo].[v_PhotovoltaicClimateData]
AS
SELECT dbo.Photovoltaic.PV_site, dbo.Photovoltaic.PV_state, dbo.Photovoltaic.PV_type_of_system, dbo.Photovoltaic.PV_nominal_power,
dbo.Photovoltaic.PV_module, dbo.Photovoltaic.PV_mounting, dbo.ClimateData.Latitude, dbo.ClimateData.Longitude, dbo.ClimateData.Altitude,
dbo.ClimateData.Climate_type
FROM dbo.ClimateData INNER JOIN
dbo.Photovoltaic ON dbo.ClimateData.PV_application_id = dbo.Photovoltaic.PV_application_id

below is my instead of trigger command...

quote:CREATE trigger [tr_v_PhotovoltaicClimateData] on [dbo].[v_PhotovoltaicClimateData] instead of insert as
BEGIN

insert Photovoltaic (PV_site, PV_state, PV_type_of_system, PV_nominal_power, PV_module,
PV_mounting)
select distinct inserted.PV_site, inserted.PV_state, inserted.PV_type_of_system,
inserted.PV_nominal_power, inserted.PV_module, inserted.PV_mounting
from inserted left join Photovoltaic on inserted.PV_site = Photovoltaic.PV_site
and inserted.PV_state = Photovoltaic.PV_state
and inserted.PV_type_of_system = Photovoltaic.PV_type_of_system
and inserted.PV_nominal_power = Photovoltaic.PV_nominal_power
and inserted.PV_nominal_power = Photovoltaic.PV_module
and inserted.PV_nominal_power = Photovoltaic.PV_mounting
where Photovoltaic.PV_site IS NULL /*** Exclude Photovoltaic already in the table ***/

insert ClimateData (Latitude, Longitude, Altitude, Climate_type, PV_application_id)
select distinct inserted.Latitude, inserted.Longitude, inserted.Altitude, inserted.Climate_type,
Photovoltaic.PV_application_id
from inserted inner join Photovoltaic on inserted.PV_site = Photovoltaic.PV_site
left join ClimateData on inserted.Latitude = ClimateData.Latitude
and inserted.Longitude = ClimateData.Longitude
and inserted.Altitude = ClimateData.Altitude
and inserted.Climate_type = ClimateData.Climate_type
where ClimateData.Latitude IS NULL /*** Exclude Climate Data already in the table ***/

END -- trigger def

this is my commad insert values using instead of trigger that i've created...

quote:insert into v_PhotovoltaicClimateData(PV_site, PV_state, PV_type_of_system, PV_nominal_power,
PV_module, PV_mounting, Latitude, Longitude, Altitude, Climate_type)
values ('CETDEM', 'Sequ Inspection', 'Cheras', 34.44 , 'ew', 'ewew',
34343.44, 323.32, 'ewew', 'ewewe')

after execute this commad, i got this error..
quote:Msg 8114, Level 16, State 5, Procedure tr_v_PhotovoltaicClimateData, Line 6
Error converting data type varchar to float.

what should i do??? anyone help me.

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Dec 6, 2006

I currently run our company website using MS Access and ASP. I am trying to upgrade the database to MSSQL Server 2000. Unfortunately I'm not finding it that straight forward. I am trying to learn MSSQL but the learning curve is a bit steep.

I have a column in my MSSQL db called tbl_FULL which contains a full description of the product along with html formatting for line breaks, paragraphs and special characters (ie ).

I have set the data type to varchar 1800. All seemed to be well until I tried to enter new data, but unfortunately it only displays the first 50 or so characters.

Can anyone tell me what I am doing wrong?

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Jan 20, 2008

I would like to use bcp and transfer image data from MS-SQL Server 6.5 to MS SQL Server 2005.

1. Can I use bcp successfully? if so should I mention any option to copy the BLOB?
2. Is there any reliable method to move tables with BLOBs

Regards,

/ash

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Data Type That Accept . For MSSQL

Sep 24, 2004

Hi,


I wish to enter some string data with period(.) in a column with char type. It doesn't accept period(.) What data type should I choose for this field ?

I'm using MSSQL Server 2000.


Please advice.

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Jul 13, 2004

I recall something about Analysis Services (SQL server tool) that is able to extract data from the DB tables (select multiple tables if one wishes (and to link those tables up ??!?)) then extracted to MS Excel. It has been a while since the course was last taught, I'm not at all sure how the steps were, or how Excel were able to display them. Would someone advice or refer to a tutorial if possible?

Much thanks!

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MSSQL DTS Newbie - Data Transfer Between Two DBs

May 15, 2006

I am just starting out with MSSQL, but have previous experience with MySQL and PGSQL. What I'm trying to do is do a nightly dump of data from a proprietary DB into MSSQL. Access to the prop DB is through an ODBC driver.

I already have a DTS script that will dump a specific table, but every time it runs it just appends the data to the end of the table.

What I am looking for is a way to download a list of tables, upload them into the MSSQL DB, and if something failed, rollback to the state before the data transfer and somehow alert of the fact.

Any help will be greatly appreciated!

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What Must Have Clients To Work With Mssql Data

Mar 10, 2004

reading help i know that client for working with mssql remote db must have installed oledbprovider for XXX

i always use ole db provider for ODBC
, this ole db provider is installed with mssql, but what exactly must to have the clients which are not familiar with this ole bd provider, what files ?

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I Need To Know Where Mssql Server Stores Its Data.

Jan 19, 2008

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Data Replication From MSSQL To MYSQL

Jul 20, 2005

Hi all.I need to set a oneway replication of some data from MSSQL (running underWindows 2000 server) to MYSQL (running under Linux).Do you have some ideas to solve the problem?Thank youLuca

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How To Specify The MSSQL.1 DATA Folder In SQL Express?

Aug 2, 2007

How do you determine the data folder during the SQL2005 Express install?
No matter what folder I start with it gets appended with MSSQL.1 or MSSQL.2
If another vendor has installed a different instance of SQL2005 how do I know whether mine is .1 or .2 ?

Basically I need to know the full folder in order to copy our MDF/LDF files into so we can attach them.

Or is there another way?

Thanks.

Graham

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Jan 22, 2008

Where is the correct forum for that,
Thanks,
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