Which aggregate function may used to calculate the cardinality of a table in SQL?a.COUNT()b.MAX()c.SUM()d.AVG()

The aggregate function that may be used to calculate the cardinality of a table in SQL is COUNT(). Here's how you can do it:

1. First, you need to select the table you want to calculate the cardinality for.

2. Then, you use the COUNT() function to count the number of rows in the table.

Here's an example of how you can do it:

SELECT COUNT(*) FROM table_name;

In this SQL statement, table_name should be replaced with the name of your table. The COUNT(*) function will return the number of rows in the table, which is the cardinality of the table.

Please note that the other functions like MAX(), SUM(), and AVG() are also aggregate functions, but they are used for different purposes. MAX() is used to find the maximum value, SUM() is used to calculate the total sum of a numeric column, and AVG() is used to calculate the average of a numeric column.