SQL ISNUMERIC Guide: Check Numeric Values

In SQL, you can use the built-in function ISNUMERIC() to determine if a value is numeric. This function returns an integer, with 1 indicating the value is numeric and 0 indicating it is not. An example is shown below:

SELECT ISNUMERIC('123') AS IsNumeric; -- 返回1
SELECT ISNUMERIC('abc') AS IsNumeric; -- 返回0

Please note that the ISNUMERIC() function does not strictly differentiate between types of numbers, such as decimals, scientific notation, etc. If a more strict number evaluation is needed, other functions or custom logic can be used.