, SUBSTRING(ExampleColumn,(CHARINDEX('.',ExampleColumn)+1),6) PostDecimal SELECT LEFT(ExampleColumn, CHARINDEX('.', ExampleColumn) - 1) PreDecimal When running into numbers like the above type - clear decimal values, yet failing every CAST/CONVERT function - the below is quick, effective work-around Note how ISNUMERIC knows these are numbers: SELECT CAST(ExampleColumn AS DECIMAL(13,6)) The below example populates data that we could normally use the CAST(ExampleColumn AS DECIMAL(22,8)) for converting to a numerical column, and these example values look no different than these rare character values the difference is that in the latter case, the casting will fail. This is part of what can create a puzzle for developers - characters which clearly are numbers, not converting or casting as decimals and failing the ISNUMERIC function (which is not always reliable, but will generally see numbers like 1.00 as valid). These rare values will always be decimal characters, with a range of length post decimal point, and will not read as numbers in both C# or PowerShell, even though they are if you were to copy them in a tool like Excel or Google Spreadsheets and run a mathematical function on them (like SUM or AVG). 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. 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. In other cases, when converting VARCHARs to numerical data points, we can use these other functions to solve the problem. 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). 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. Trimming function works to remove the error. If we copy the values directly and do a direct SELECT CAST('1.00000' AS DECIMAL(22,8)), they convert without error.They appear as numerical characters, yet don't convert.More info about this driver can be found at the Microsoft product page. The driver supports applications written using earlier versions of ODBC in the manner defined in the ODBC 3.51 specification. The SQL Native Client ODBC driver complies with the Microsoft Win32 ODBC 3.51 specification. The SQL Native Client driver supports connecting to SQL 7.0 and later. The driver passes SQL statements to SQL Server and returns the results of the statements to the application. The SQL Server-specific versions of the ODBC functions are implemented in the SQL Native Client ODBC driver. Programs that are written using the SQL Native Client ODBC driver communicate with SQL Server through function calls. The driver is included in the "Microsoft SQL Server 2012 Feature Pack". The SQL Server Native Client 11.0 ODBC Driver was released with SQL Server 2012 and can access SQL Servers from 2005 and above. Include "Driver=" in the connection string to use this driver. The main functionality of the driver is contained in the file sqlncli10.dll. This ODBC Driver is provided by Microsoft.
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