Handling A Conversion Error
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'try_convert' Is Not A Recognized Built-in Function Name.
8 down vote favorite So I'm trying to convert strings in an SQL databse into datetime values. I have some dates in a table like this: 23/12/2013 16:34:32 24/12/2013 07:53:44 24/12/2013 09:59:57 24/12/2013 12:57:14 24/12/2013 12:48:49 24/12/2013 13:04:17 24/12/2013 13:15:47 24/12/2013 13:21:02 24/12/2013 14:01:28 24/12/2013 14:02:22 24/12/2013 14:02:51 They are stored as strings unfortunately And I want to convert them to datetime SELECT CONVERT(datetime, analysed, 103 ) FROM OIL_SAMPLE_UPLOAD error converting data type varchar to numeric. However I get this message when I run the query The conversion of a varchar data type to a datetime data type resulted in an out-of-range value. Presumably because some values are badly formed (although I am yet to spot any of these) It's ok if some values don't convert, I just need a way of handling this situation. Something like ISNULL(CONVERT(datetime, analysed, 103 )) would be good except that the convert function does not return NULL when it fails. sql string tsql error-handling type-conversion share|improve this question asked Jan 29 '14 at 4:20 sav 7941922 to be clear the strings are in dd/MM/yyyy hh:mm:ss format –sav Jan 29 '14 at 4:31 add a comment| 3 Answers 3 active oldest votes up vote 11 down vote accepted For SQL Server you can use ISDATE() function to check whether value is valid date SELECT CASE WHEN ISDATE(analysed)=1 THEN CONVERT(datetime, analysed, 103 ) ELSE '' END FROM OIL_SAMPLE_UPLOAD share|improve this answer answered Jan 29 '14 at 4:25 mhasan 15k54484 1 I'd prefer not to make any changes to the database I'm using. ie: I'd prefer to to change SET DATEFORMAT dmy; unless the change only exists for the duration of the query
| Related Tips: More > Data Types Problem We've been importing data into VARCHAR columns to verify valid character types before moving into our final destination table and we ran across some decimal conversion error from string firebird values that wouldn't CAST or CONVERT even though they appeared to be decimal values
Try_cast' Is Not A Recognized Built-in Function Name
(other decimal values from the same source converted without errors). We received the message "Error converting data type varchar to numeric" and
Sql Isdate
even when we tried to import them as numbers they also failed. In addition, all values failed the ISNUMERIC function even though the values look numeric (like 1.00) and when we copy these values into http://stackoverflow.com/questions/21422029/how-to-handle-date-conversion-error-in-sql Google Spreadsheets and run functions on them, we get numerical answers. How can we load these problem values? Solution Here is an example of the issue I was facing. In the below screenshot the data looks correct, but when I checked to make sure the values were numeric using a CAST function I got the following error message. Here are some of the things I noticed: They appear as numerical characters, https://www.mssqltips.com/sqlservertip/4008/handling-error-converting-data-type-varchar-to-numeric-in-sql-server/ yet don't convert.If we copy the values directly and do a direct SELECT CAST('1.00000' AS DECIMAL(22,8)), they convert without error.If they come with extra spaces, no trimming function works to remove the error. We seldom stumble on these types of data, but they can create encumbrances for developers, so it's good to know a work-around when transforming these VARCHARs into numerical data points. What differs about these data, compared to other times when facing issues with converting numerical VARCHARs to numerical data points is that all of them will fail the ISNUMERIC (for verifying), CAST, CONVERT, TRY_CONVERT and TRY_PARSE functions (the latter two returning NULLs). In other cases, when converting VARCHARs to numerical data points, we can use these other functions to solve the problem. In the below five examples, we expect to receive the error "Error converting data type varchar to numeric" on three of these due to characters that aren't convertible to decimals. We would not, however, expect to get this error on the second value (1.000000), yet these data will be formatted this way, which is why developers can become confused as to why clear decimal values aren't converting. SELECT CAST('Dog' AS DECIMAL(22,8)) SELECT CAST('1.000000' AS DECIMAL(22,8)) SELECT CAST('$1.00' AS DECIMAL(22,8)) SELECT CAST('765e1' AS DECIMAL(22,8)) SELECT CAST('22' AS
New? Advanced Search Forum Database Discussions MS SQL Server 7/MS SQL Server 2000 t-sql data type conversion error handling If this is your first visit, be sure to check out the FAQ by http://forums.databasejournal.com/showthread.php?13507-t-sql-data-type-conversion-error-handling clicking the link above. You may have to register before you can post: click the https://doc.rust-lang.org/book/error-handling.html register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. Results 1 to 2 of 2 Thread: t-sql data type conversion error handling Tweet Thread Tools Show Printable Version Email this Page… Subscribe to this Thread… Display Linear Mode Switch to Hybrid Mode Switch to Threaded conversion error Mode 06-21-2001,06:09 PM #1 jim Guest t-sql data type conversion error handling I'm trying to convert a column from a varchar(14) to float, some of the rows contain some non-numeric characters. I've tried to write a cursor to step through the records, run cast(col1 as float) on each record, then use if @@error <> 0 to capture an error but it doesn't work. It steps through fine but when the cast command fails is not a it ends the execution of the script with "Error converting data type varchar to float." How can i capture this error without having the script fail? Is there another way to get this done? Thanks, Jim Reply With Quote 06-22-2001,03:21 AM #2 Guest t-sql data type conversion error handling (reply) Use IsNumeric function before doing the cast operation ------------ jim at 6/21/01 7:09:17 PM I'm trying to convert a column from a varchar(14) to float, some of the rows contain some non-numeric characters. I've tried to write a cursor to step through the records, run cast(col1 as float) on each record, then use if @@error <> 0 to capture an error but it doesn't work. It steps through fine but when the cast command fails it ends the execution of the script with "Error converting data type varchar to float." How can i capture this error without having the script fail? Is there another way to get this done? Thanks, Jim Reply With Quote Quick Navigation MS SQL Server 7/MS SQL Server 2000 Top Site Areas Settings Private Messages Subscriptions Who's Online Search Forums Forums Home Forums Database Discussions IBM DB2 Informix Microsoft Access Microsoft SQL Server 2008 Microsoft SQL Server 2005 MDX and Analysis Services Reporting Services MS SQL Server 7/MS SQL Server 200
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