COUNT() function ignores null values while counting the records.
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Reason — The COUNT() function is used to count the number of non-null values in a column. It ignores any null values present in the column.
COUNT()
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DISTINCT option causes a group function to consider only the unique values of the argument expression.
By default, ORDER BY clause sorts the result set in descending order.
The return value of MAX() function is a numeric value.
Multiple row function is also known as scalar function.