What is the use of count function in SQL?

What is the use of count with query?

You can count the number of items in a field (a column of values) by using the Count function. The Count function belongs to a set of functions called aggregate functions. You use aggregate functions to perform a calculation on a column of data and return a single value.

Why do we use count (*)?

SQL COUNT Syntax: If you use an asterisk, Count calculates the total number of records, including those that contain Null fields. Count(*) is considerably faster than Count([Column Name]).

How do I do a count in SQL?

SQL COUNT() Function1SQL COUNT(column_name) Syntax. The COUNT(column_name) function returns the number of values (NULL values will not be counted) of the specified column: ... 2SQL COUNT(*) Syntax. The COUNT(*) function returns the number of records in a table: ... 3SQL COUNT(DISTINCT column_name) Syntax.SQL COUNT() Function

What is the use of count and count (*)?

The count(*) returns all rows whether column contains null value or not while count(columnName) returns the number of rows except null rows. Let us first create a table.