I would like to convert a field from ntext field found in one database
table to float field found in another database table. The reason why I
want to do this is a long one.
I have tried the following and playing around with the following:
declare @valuePointer varbinary(16)
<Row cursor logic to initialize @valuePointer to be a pointer to the
source ntext field>
update TargetFloatTable set TargetFloatTable.TargetFloatValue =
CAST(CAST(@valuePointer AS nvarchar) AS float)
where TargetFloatTable.Id = @Id
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
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!
why does converting integer to float take so long? Its a column with about 5 Million rows. I want to avoid cast(inumber1 as float) / cast(inmuber2 as float), thats why converting them. Queries should be a bit faster after that.. hope so :) Thanks a lot
I have a data type float with a value of 10000487930 that I'm trying to insert into a data type nvarchar and am getting the result of '1.00005e+010'. I've tried cast(field as nvarchar) however this is not working. What might fix this? I cannot change the insert table data type.
Select Cast('100.1234' as float)give me the result 100.1234Now when I convert it back to char I want exactly 100.1234Select Convert(char(100),Cast('100.1234' as float))Gives me 100.123 (Here I was expecting 100.1234)When I doSelect STR(Cast('100.1234' as float),25,4)I get back the result as 100.1234However here I am not sure how many digits do I have after the decimalpoint. If I put some value likeSelect STR(Cast('100.1234' as float),25,8)I get 0's appended to it, which is again not desired.Thanks in advance,Jai
Is this possible? I'm trying to user a lookup task and the data I want to compare is a varchar to float. How can I do this? I tried using the data conversion task and it didn't work and also tried cast and convert. Is this even possible or is there a way around it?
I have a field in my database that is stored as varchar. The values are usually contain a decimal, and should have really been a float or decimal. In order for me to do analytics in my BI environment, I need to convert this to a float or decimal.
eg of values.
10.00 20.00 0.00 15.00
or could be missing when I use cast(value as float) or cast(value as decimal(9,2)) or convert(float, value) I get an error
Can you guys help me out? I m trying to sum up some varchar-typed field. I need to convert it to float before doing the summing up so I m using "Cast".
I do get the answer but its not the correct figure. My SQL statement is as follow:
SELECT Sum((Cast(Qty1 as float)) + (Cast(Qty2 as float))) as intAnswer FROM TableName
Hello I have some problems with converting varbinary to float in T-SQLstored procedure. In my C# application i have table of structures withdouble type fields. Size of this table is variant. I have to send thistable to SP. Because of performance i want to send it only once andwhole. So I have to cut this varbinary blob in my Stored procedure toreceive structure field values. But I have problems with double fields- conversion from varbinary to float in T-SQL is not allowed. Pleasehalp me - thx for any advise.Maciej
I have a column type of float and How to convert it show like this
default value =39260.80 MY db use this ',' seperator instead of '.' wanna convert 39,260
This code is working if using '.' seperator
SELECT parsename(convert(varchar,CAST(floor('39260.80') AS MONEY),1),2) not work using ',' seperator SELECT parsename(convert(varchar,CAST(floor('39260,80') AS MONEY),1),2)
I'm trying to move records from a SQL table with a float column to a DB2 database that has the column defined as Decimal (8,2) It keeps crashing saying it has a type mismatch problem. I tried changing my source command to pass in the column already converted and it still crashes on this. I also tried doing a data conversion task to do the conversion and I still get the same error. Any ideas?
I seem to always get the "Fun Stuff" to try and figure out. I have an entire table that was pumped out of Oracle. I even hate saying that word!
There are a couple columns that are Float data type, and they are storing phone numbers as a Float data type. I am not able to CAST these into anything that is legible.
This is one of the values that I made up that look like some of the others.
how to convert float to timestamp in single select query..for exp. i have float as 1.251152515236 ,i want to convert this to datetime and from datetime to timestamp... i.e. 26:11:00
Hi there, I've a question regaarding datatype conversions... I can't convert the above mentioned datatype. I always get an error message that the conversion fails. Doesn't matter If convert or cast is used.
How would you convert the above mentioned variable into float???
I need to sort by an ntext field, but it won't let me do it.
However, if I cast the field as nvarchar(100), I can use ORDER BY on that.
Is there any reason that this is a bad idea? In my testing, ordering by a converted ntext field was actually *faster* than ordering by an nvarchar (same data in the fields).
I have been given some data from a Mainframe (AS400?) which has some fields coded in Packed Decimal. I have been able to load the data into a SQL2005 database table, but I now need to convert the Packed Decimal data in the binary(6) field to the appropriate integer (or float) value.
The field contains values such as the following:-
0x20202020200C
0x202020022025
0x20202020DFFA
I don't know how to interpret these. Has anyone got a function that can do this for me?
I've read several articles online that explain how packed decimal works, but none tell me how to interpret the last of my three examples. Can you help?
Hello Guys,Have been getting this error( Implicit conversion from data type ntext to varchar is not allowed. Use the CONVERT function to run this query. ) when running on the live environment but it was fine when run locally. If anyone has similar problem please let me know the fix you have done. Thank you.
I am running this query to an sql server 2000 database from my aspcode:"select * from MyTable whereMySqlServerRemoveStressFunction(MyNtextColumn) = '" &MyAdoRemoveStressFunction(MyString) & "'"The problem is that the replace function doesn't work with the ntextdatatype (so as to replace the stresses with an empty string). I hadto implement the MySqlServerRemoveStressFunction, i.e. a function thattakes a column name as a parameter and returns the text contained inthis column having replaced some letters of the text (the letters withstress). Unfortunately, I could not do that because user-definedfunctions cannot return a value of ntext.So I have the following idea:"select * from MyTable whereCheckIfTheyAreEqualIngoringTheStesses(MyNtextColum n, '" & MyString &"')"How can I implement the CheckIfTheyAreEqualIngoringTheStessesfunction? (I don't know how to combine these functions to do what Iwant: TEXTPTR, UPDATETEXT, WRITETEXT, READTEXT)
I have a ntext column which stores rows of xml data. Ive decided that the best way to query the xml data is to Convert the ntext data into xml data type and use Sql Server 2005 builtin Xml Query tools to perform FLWOR expressions. The problem Im having is getting the ntext data Converted to xml.When I try to convert the ntext text, I of course get an error that local variables of ntext type are invalid.Any suggestions on a way I might accomplish this?Thanks, -lance
Dear Experts,Ok, I hate to ask such a seemingly dumb question, but I'vealready spent far too much time on this. More that Iwould care to admit.In Sql server, how do I simply change a character into a number??????In Oracle, it is:select to_number(20.55)from dualTO_NUMBER(20.55)----------------20.55And we are on with our lives.In sql server, using the Northwinds database:SELECTr.regionid,STR(r.regionid,7,2) as a_string,CONVERT(numeric, STR(r.regionid,7,2)) as a_number,cast ( STR(r.regionid) as int ) as cast_to_numberFROM REGION R1 1.00112 2.00223 3.00334 4.0044SELECTr.regionid,STR(r.regionid,7,2) as a_string,CONVERT(numeric, STR(r.regionid,7,2) ) as a_number,cast (STR(r.regionid,7,2) as numeric ) as cast_to_numberFROM REGION R1 1.00112 2.00223 3.00334 4.0044Str converts from number to string in one motion.Isn't there a simple function in Sql Server to convertfrom string to number?What is the secret?Thanks
Hi! I'm quite new to SQL Server. I need to set a float datatype to display something like 3.55. However, all values that are stored in the float column are truncated to 4 or some other single digit. How can this be prevented?
