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Efficient ISNUMERIC () replacements on SQL Server? IsNumeric () seems to have problems with spaces, 'D', 'E', dollar signs and all sorts of other characters What we typically want is something that tells us whether a CAST or CONVERT will succeed
Don’t use ISNUMERIC: Use TRY_CONVERT or a CASE Expression In SQL Server Depending on your query needs, you can certainly use TRY_CONVERT in most situations, assuming you’re on SQL Server 2016+ For everyone else, and even maybe people on 2016+, that CASE expression works really well for rooting out things that aren’t numbers Thanks for reading!
ISNUMERIC (Transact-SQL) - SQL Server | Microsoft Learn ISNUMERIC returns 1 for some characters that aren't numbers, such as plus (+), minus (-), and valid currency symbols such as the dollar sign ($) For a complete list of currency symbols, see money and smallmoney (Transact-SQL)
A CLR Alternative to the SQL Server ISNUMERIC function While the T-SQL solution above would be adequate for most situations, I wanted a more elegant alternative that not only would correctly test for numeric values, but also test for a specific numeric type, going so far as to indicate if a particular value would fit into the specified Decimal precision