Which SQL function is used to count the number of rows in a SQL query?COUNT()NUMBER()SUM()COUNT(*)

The SQL function used to count the number of rows in a SQL query is COUNT().

Explanation:

1. COUNT() is a standard SQL aggregate function designed to return the number of rows that meet a specified criterion within a table or the total number of rows in a dataset.
2. COUNT(*) is a specific usage of the COUNT function, which counts all rows in the result set, including those with NULL values in any columns.

Given the options provided, both COUNT() and COUNT(*) are correct, with COUNT(*) being the most common expression to count all rows.

In conclusion, the most appropriate answer among the options is COUNT(), with COUNT(*) as a specific case for counting all rows.