The query “value must be ≥ 0 but getcolumnindex can be -1” is not clear. It seems to be a combination of two different conditions. Let’s break down each condition and explain them separately with examples:
Condition 1: value must be ≥ 0
This condition suggests that the value should be greater than or equal to 0. It is straightforward and can be represented with a simple comparison operator: “value >= 0”.
Example 1: If we have a variable called “value” with a value of 5, the condition “value >= 0” will evaluate to true since 5 is greater than 0.
Example 2: If we have a variable called “value” with a value of -2, the condition “value >= 0” will evaluate to false since -2 is not greater than or equal to 0.
Condition 2: getcolumnindex can be -1
This condition seems to be related to a function or method called “getcolumnindex”. It suggests that the value returned by this function can be -1.
Example 1: Let’s assume “getcolumnindex” is a function that returns the index of a column in a table. If the column is not found, it might return -1. So, this condition allows for the possibility of “getcolumnindex” returning -1.
Example 2: If “getcolumnindex” is a function that always returns a positive index number or zero, this condition will never be met since -1 would not be a valid return value.
Overall, it is recommended to provide more context or clarify the query to provide a more specific answer.