To list all acceptable characters, we used the following SQL Command: In the official documentation, it is mentioned that “ISNUMERIC returns 1 for some characters that are not numbers, such as plus (+), minus (-), and valid currency symbols such as the dollar sign ($).” Since not only exact numbers are considered valid numeric data types, the ISNUMERIC function will return 1 even if the expression contains some symbols and alphabets. A valid numeric data type is one of the following types: bit, tinyint, smallint, int, bigint, decimal, numeric, float, real, money, smallmoney.Ĭharacters considered as valid numeric data type If the input expression is evaluated to a valid numeric data type, SQL Server ISNUMERIC returns 1 otherwise, it returns 0. It is a scalar function that takes a string expression as a parameter and returns an integer. What is the SQL Server ISNUMERIC function?Īs defined in the official Microsoft SQL Server documentation, the ISNUMERIC function determines whether an expression is a valid numeric type. It explains how to use thisįunction, illustrates its limitations, and provides some alternatives. This article gives an overview of the SQL Server ISNUMERIC built-in system function.
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