Question

What does the isnull function do?

1) Returns true if the specified expression is null, otherwise false
2) Returns the number of null values in a specified column
3) Returns the average of non-null values in a specified column
4) Returns the maximum value among the non-null values in a specified column

Answer 1

The isnull function is used to determine whether a value is null or not in computer programming and databases.

Step-by-step explanation:

The isnull function is used in computer programming and databases to determine whether a value is null or not. In particular, this function is commonly used in SQL queries to check if a column contains null values.

The correct answer to the given question is option 1) Returns true if the specified expression is null, otherwise false. This means that the isnull function will evaluate an expression and return true if the expression is null, or false if it is not null.