How does Oracle determine if a field consists of only n…

In Oracle, you can use regular expressions to check if a field consists of only numbers. Below is an example query demonstrating how to use regular expressions to determine if a field contains only numbers.

SELECT
    column_name
FROM
    table_name
WHERE
    REGEXP_LIKE(column_name, '^[0-9]+$');

In the above query, the column_name is the name of the field to be evaluated, and table_name is the name of the table where the field is located. The function REGEXP_LIKE is used to determine if the value of the field matches the given regular expression. The regular expression ^[0-9]+$ signifies matching a string composed of digits 0 through 9, and the string must contain at least one character.

If the query result is empty, it means the field is not purely numeric; if the query result is not empty, it means the field is purely numeric.