Question

Which SQL function is used to count the number of rows (all) in a SQL query?

a) COUNT()

b) NUMBER()

c) SUM()

d) COUNT(*)​

Answer 1

Answer:

a ) COUNT ()

function returns the number of rows that matches a specified criterion

Answer 2

SQL function Option(d) COUNT(*) is used to count the number of rows (all) in a SQL query

Explanation:

• In SQL query, the COUNT(*) method reports the total number of rows in a table, including duplicate rows. Each row is counted independently. This includes any rows with null values.
• In SQL query, the COUNT() function returns the number of rows that meet the given criteria. COUNT(column name) counts all the rows in the provided column, ignoring NULL values.
• In SQL query, the SUM() function calculates the total sum of a set of numeric columns.