I have over thousands data on my table, in this case i want to change data type hexadecimal value into integer. here's table example :
hex int
000001CA |
000001D3 |
000001F5 |
this is my query :
UPDATE table
SET int = CONVERT(int, CONVERT(varbinary, hex, 2))
when i execute the query i get error message that some value error failed converting data type but i dont know which one because there are many data on the table. Is there a way to find the error value or just skip the error and continue other value ?
Thanks for the help.
You can simply change it to:
UPDATE table
SET int = TRY_CONVERT(int, TRY_CONVERT(varbinary, hex, 2))
TRY_CONVERT will attempt to convert the value and if it cannot, return a NULL.
Another option is to select the hex values from your table and use
WHERE TRY_CONVERT(int, TRY_CONVERT(varbinary, hex, 2)) IS NOT NULL
to get all the valid, convert-able values. Then you can run your update knowing it is only using valid values.
You can use TRY_CONVERT to find the records that are failing to convert. This function will return NULL if conversion fails.
Returns a value cast to the specified data type if the cast succeeds; otherwise, returns null.
https://learn.microsoft.com/en-us/sql/t-sql/functions/try-convert-transact-sql?view=sql-server-ver15
select t.*
from table t
where try_convert(int, CONVERT(varbinary, t.hex, 2)) is null;
There's no problem with your Update statement except for the table name(table). Even a table with this name cannot be created, but if you convert it to [table], then the statement will be succesfull :
UPDATE [table]
SET int = CONVERT(int, CONVERT(varbinary, hex, 2)); -- case hex is type VARCHAR
SELECT *
FROM [table];
int hex
458 000001CA
467 000001D3
501 000001F5
OR
UPDATE [table]
SET int = CONVERT(int, hex) -- case hex is type VARBINARY
SELECT *
FROM [table];
int hex
458 0x000001CA
467 0x000001D3
501 0x000001F5
Demo
P.S.:TRY_CONVERT(int, TRY_CONVERT(varbinary, hex, 2)),which's stated within the other answers, would return the same result.
Related
I am trying to concatenate two integer values with hyphen in between. So when I try to do the same, SQL gives me the error.
Conversion failed when converting the varchar value '30-45' to data type int.
NOTE:
Also, the second value for concatenation can be null so in that case, a hyphen should not be concatenated.
example
from1 = 30
to1 = 45
case
to1 is null
then from1
else CONCAT(from1, '-' + nullif(to1,'')) end
AS age
//This works but shows 3045 instead of 30-45.
concat(from, '-', to) AS age
//This doesn't work out as it gives the error 'Conversion failed when converting the varchar value '30-45' to data type int.'
Thanks for the help in advance and looking forward to it.
DECLARE #FROM INT=30;
DECLARE #TO INT=45;
SELECT CAST(#FROM AS VARCHAR(2))+'-'+CAST(ISNULL(#TO,'') AS VARCHAR(2));
SQL is trying to convert your phrase to int probably because it's part of CASE statement. It uses the first route to determine the output type.
In your case- you put NULL as the first route option in your CASE, so it is determined as int. try putting instead of it this: CAST(NULL AS VARCHAR(10))
It seems that for some reason you think that strings that contain mathematical expressions are resolved as said expression, not an as literal string. Thus if you have the varchar value '30-45' you think it'll return the int value -15; this isn't true. This in fact isn't true in any language, let alone T-SQL.
For what you have, in your ELSE the '-' isn't a minus... It's a string... - is a minus. If you want to substract a number from another then it's a basic maths expression: a - b. You're effectively doing CONVERT(varchar,a) + '-' + CONVERT(varchar,b)... Just have your ELSE as the following:
from1 - NULLIF(to1,0)
This will return NULL if from1 has the value NULL, or to1 has the value NULL or 0.
Please check below code. It's working
example
#from1 = 30
#to1 = 45
IF #to1 is null
SELECT #from1
ELSE
SELECT CONCAT(#from1, '-' , nullif(#to1,'')) as age
I am getting this error when I run the case statement below. I think I have to convert at some point, but not sure where or how.
update [092018]
set duration1 = duration
where duration1 is null
and (durationms > 100 and durationms < 1000)
Conversion failed when converting the varchar value 'durationms' to data type int
It sounds like your duarationms column is text of some sort. You may try casting it to integer:
UPDATE [092018]
SET duration1 = duration
WHERE duration1 IS NULL AND
CAST(durationms AS int) > 100 AND CAST(durationms AS int) < 1000;
Note that for brevity you could have written the WHERE clause as:
WHERE duration1 IS NULL AND CAST(durationms AS int) BETWEEN 101 AND 999;
If you plan on doing arithmetic with the data contained in durationms, then consider making it a numeric/integer column.
Edit:
If the above query is still not working, then your data might be in even worse shape than we thought. There could be non numeric data in the durationms column. To flag out records which can't be cast to integer, use the following query:
SELECT *
FROM [092018]
WHERE TRY_CONVERT(int, durationms) IS NULL;
Any records returned should have durationms values which can't be coerced into integers.
If your version of SQL Server does not support TRY_CONVERT, then here is another option:
SELECT *
FROM [092018]
WHERE durationms LIKE '%[^0-9]%';
I'm trying to convert my database fields from VARCHAR(4) to FLOAT. Some of the values in these fields might not be digits since these fields didn't have any validation prior. My main target is to convert any integer or decimal value in float format and save in new database field. For this process I use INSERT SELECT STATEMENT from old table into the new table. So far I have this line of code for my conversion:
CASE WHEN LEN(LTRIM(RTRIM(hs_td2))) <> 0 AND ISNUMERIC(hs_td2) = 1 THEN CAST(LTRIM(RTRIM(hs_td2)) AS float) ELSE NULL END AS hs_td2
First step I trim the value then check if it's numeric and then convert to float otherwise set to NULL. With the code above I'm getting this error message in Microsoft Studio:
Msg 8114, Level 16, State 5, Line 13
Error converting data type varchar to float.
Line 13th is beginning of my SELECT statement. Then I tried this conversion as well:
CASE WHEN LEN(LTRIM(RTRIM(hs_td2))) <> 0 AND ISNUMERIC(hs_td2) = 1 THEN CONVERT(FLOAT, LTRIM(RTRIM(hs_td2))) ELSE NULL END AS hs_td2
and I got the same error message. Values in my fields could be something like this:
10 or 5 or -10 or 0.9 or 11.6 or -11.89 and so on...
I'm wondering if isNumeric() is the best function that I should use and why my code produces the error message listed above?
If anyone can help please let me know. Thank you!
No, ISNUMERIC is not the best function to use.
Essentially, this question has been asked before, though not in this wording:
Try_Convert for SQL Server 2008 R2
The most upvoted answer recommends to cast to XML to use XML-specific casting function:
DECLARE #T TABLE (v varchar(4));
INSERT INTO #T (v) VALUES
('1g23'),
('-1.8'),
('11.6'),
('akjh'),
('.'),
('-'),
('$'),
('12,5');
select
cast('' as xml).value('sql:column("V") cast as xs:float ?', 'float') as new_v
from #T
I'll leave my first version of the answer below.
Most likely you are getting the conversion error because the server tries to run CAST(LTRIM(RTRIM(hs_td2)) AS float) for each row of the table, not only for those that are numeric.
This usually happens when you try to filter out non-numeric rows using the WHERE ISNUMERIC(...) = 1 filter. Technically it may happen in CASE expression as well.
That's why they added TRY_CONVERT in 2012.
I'd try to write my own user-defined function that uses TRY-CATCH and tries to convert the given value. Yes, it will be slow.
Having said that, the example below with CASE runs fine:
DECLARE #T TABLE (v varchar(4));
INSERT INTO #T (v) VALUES
('123'),
('-1.8'),
('11.6'),
('akjh'),
('123');
SELECT
CASE WHEN ISNUMERIC(v) = 1 THEN CAST(v AS float) ELSE NULL END AS new_v
FROM #T;
Result
+-------+
| new_v |
+-------+
| 123 |
| -1.8 |
| 11.6 |
| NULL |
| 123 |
+-------+
But, if I put a . or - or $ value, like so:
INSERT INTO #T (v) VALUES
('123'),
('-1.8'),
('11.6'),
('akjh'),
('$');
The query fails:
Error converting data type varchar to float.
There may be other special characters and their combinations that ISNUMERIC would not complain about. That's why I originally said that overall, ISNUMERIC is not the best function to use.
If it is a one-off conversion, you can try to build a LIKE expression to catch all special cases that are present in your data, but if you need a reliable generic solution, upgrade to 2012+ and use TRY_CONVERT or write your T-SQL UDF, or your CLR UDF.
Sqlxml has enough power to make magic. Of course, the performance is the problem. But still better, than million of conditions
DECLARE #T TABLE (v varchar(4));
INSERT INTO #T (v) VALUES
('123'),('-1.8'),('11.6'),('akjh'),('$'),('-.'),('-.1'),(NULL);
declare #Xml xml = (SELECT v FROM #T T for xml auto,elements);
select T.v.value('v[1]','varchar(4)') v, T.v.value('max(v[1])','float') converted_v
from #xml.nodes('/T') T(v);
It depends on the values in your varchar columns
ISNUMBER() for vaule such as '.' and '-' will return 1, however, it will failed when you CAST to FLOAT
ISNUMBER() for value such as '3D2' , '1e2' will return 1, and can be CAST to FLOAT, however, you may not want consider it as number.
You may try the following to convert
CASE WHEN
not LTRIM(RTRIM(hs_td2))like '%[^0-9.,-]%' -- Value only contains 0-9 . -
and LTRIM(RTRIM(hs_td2)) not like '.' -- can not be only .
and LTRIM(RTRIM(hs_td2)) not like '-' -- can not be only -
and isnumeric(LTRIM(RTRIM(hs_td2))) = 1
THEN CAST(LTRIM(RTRIM(hs_td2)) AS float)
ELSE NULL
END
I am currently trying to return '' for values that are either NULL or 0, but am unable to do so:
select isnull(cast(sec_column as varchar(10)),'')
sec_column is Numeric
The above produces the follow sql error:
"Arithmetic overflow error converting numeric to data type varchar"
Additionally, I have tried something simpler along the lines of an ISNULL to achieve this, but to no avail:
select isnull(sec_column,'')
I assume that I should be able to cast as a string value and return blank. Any insight into this would be much appreciated!
That error for the given code would indicate you need a larger varchar():
select isnull(cast(sec_column as varchar(39)),'')
declare #val numeric(38,2) = '123456789123456789123456789123456789.12'
/* works fine */
select convert(varchar(39),#val)
select convert(varchar(10),#val)
/* Arithmetic overflow error converting numeric to data type varchar. */
rextester demo: http://rextester.com/GMYUUN51608
Perhaps this can help.
Assuming sec_column is a numeric, and you want to show zeros and nulls as ""
select isnull(cast(nullif(sec_column,0) as varchar(10)),'')
Example
Declare #YourTable Table (sec_column int)
Insert Into #YourTable Values
(1)
,(null)
,(25)
,(0)
select *
,AsString = isnull(cast(nullif(sec_column,0) as varchar(10)),'')
From #YourTable
Returns
sec_column AsString
1 1
NULL
25 25
0
How to convert Varchar to Int in sql server 2008.
i have following code when i tried to run it wont allowed me to convert Varchar to Int.
Select Cast([Column1] as INT)
Column1 is of Varchar(21) NOT NULL type and i wanted to convert it into Int.
actually i am trying to insert Column1 into another table having Field as INT.
can someone please help me to convert this ?
Spaces will not be a problem for cast, however characters like TAB, CR or LF will appear as spaces, will not be trimmed by LTRIM or RTRIM, and will be a problem.
For example try the following:
declare #v1 varchar(21) = '66',
#v2 varchar(21) = ' 66 ',
#v3 varchar(21) = '66' + char(13) + char(10),
#v4 varchar(21) = char(9) + '66'
select cast(#v1 as int) -- ok
select cast(#v2 as int) -- ok
select cast(#v3 as int) -- error
select cast(#v4 as int) -- error
Check your input for these characters and if you find them, use REPLACE to clean up your data.
Per your comment, you can use REPLACE as part of your cast:
select cast(replace(replace(#v3, char(13), ''), char(10), '') as int)
If this is something that will be happening often, it would be better to clean up the data and modify the way the table is populated to remove the CR and LF before it is entered.
you can use convert function :
Select convert(int,[Column1])
That is how you would do it, is it throwing an error? Are you sure the value you are trying to convert is convertible? For obvious reasons you cannot convert abc123 to an int.
UPDATE
Based on your comments I would remove any spaces that are in the values you are trying to convert.
That is the correct way to convert it to an INT as long as you don't have any alpha characters or NULL values.
If you have any NULL values, use
ISNULL(column1, 0)
Try the following code. In most case, it is caused by the comma issue.
cast(replace([FIELD NAME],',','') as float)
Try with below command, and it will ask all values to INT
select case when isnumeric(YourColumn + '.0e0') = 1
then cast(YourColumn as int)
else NULL
end /* case */
from YourTable
There are two type of convert method in SQL.
CAST and CONVERT have similar functionality. CONVERT is specific to SQL Server, and allows for a greater breadth of flexibility when converting between date and time values, fractional numbers, and monetary signifiers. CAST is the more ANSI-standard of the two functions.
Using Convert
Select convert(int,[Column1])
Using Cast
Select cast([Column1] as int)