Does sum ignore null values mysql?
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To see it in action, please see this sql fiddle: http://www.sqlfiddle.com/#!2/d1542/3/0 More Information: Given three tables (one with all numbers, one with all nulls, and one with a mixture): SQL Fiddle MySQL 5.5.32 Schema Setup:
Query 1:
Results: Suppose if we are calculating the sum of the values of a column which also have NULL values then MySQL SUM() function ignores the NULL values and does the sum of the rest of the values. To understand it, consider the following example of table ‘employee’, having following details − mysql> Select * from Employee; +----+--------+--------+ | ID | Name | Salary | +----+--------+--------+ | 1 | Gaurav | 50000 | | 2 | Rahul | 20000 | | 3 | Advik | 25000 | | 4 | Aarav | 65000 | | 5 | Ram | 20000 | | 6 | Mohan | 30000 | | 7 | Aryan | NULL | | 8 | Vinay | NULL | +----+--------+--------+ 8 rows in set (0.00 sec) Now, suppose if we want to have the total salary of the employees from above table then while calculating it with SUM() function, it ignores the NULL values. The following query will produce the required result set − mysql> Select SUM(Salary) from Employee; +-------------+ | SUM(Salary) | +-------------+ | 210000 | +-------------+ 1 row in set (0.00 sec) It can also be verified with the help of the following query − mysql> Select SUM(Salary) from Employee WHERE Salary IS NOT NULL; +-------------+ | SUM(Salary) | +-------------+ | 210000 | +-------------+ 1 row in set (0.00 sec)
Updated on 30-Jul-2019 22:30:21
Summary: in this tutorial, you will learn how to use the MySQL Introduction to the MySQL SUM() functionThe
Here is how the
MySQL SUM() function illustrationFirst,
create a new table named
Then, insert some rows into the
Third, use the
As you can see, the Finally, use the
In this case, the MySQL SUM() function examplesLet’s take a look at the table 1) Simple MySQL SUM() function exampleThis example uses the
2) MySQL SUM() function with expression exampleThe following shows the order line items of the order number 10110:
To calculate the total for the order number 10110, you use the
In this tutorial, the
3) MySQL SUM() with the GROUP BY clause exampleThe For example, you can calculate the total amount of each order by using the
In this example:
4) MySQL SUM() with HAVING clause exampleYou can use the
5) MySQL SUM() with NULL exampleThe In this case, you can use the See the following query:
6) MySQL SUM() with join exampleSee the following You can use the This statement uses the
7) MySQL SUM IF exampleThe following statement uses the
If you want to rotate rows to columns, you can use the
In this tutorial, you have learned how to use the MySQL
Was this tutorial helpful? Does SUM in SQL ignore NULL?Definition and Usage. The SUM() function calculates the sum of a set of values. Note: NULL values are ignored.
Can you SUM a NULL value in SQL?MySQL and PostgreSQL cannot sum up NULL values with the + value. The sum value will be NULL . If you want to do additions in the database: use SUM if it's an option to sum up a column of a result set instead of expressions ( SUM ignores NULL values)
Does SUM count NULL values?NULL does not equal to 0 or an empty string. Both 0 and empty string represent a value, while NULL has no value. Aggregate functions such as SUM, COUNT, AVG, MAX, and MIN exclude NULL values.
Does Count ignore NULL values MySQL?The MySQL COUNT() function provides a number of records in the result set from a table when an SQL SELECT statement is executed. This function does not count the NULL values.
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