How do I apply a condition to a sum function in SQL?

How do I apply a condition to a sum function in SQL?

SELECT SUM(column_name) FROM table_name WHERE condition;

1. SQL SUM() function example – On a Specific column.
2. SUM() function On multiple columns.
3. SQL SUM() with where clause.
4. SQL SUM() EXAMPLE with DISTINCT.
5. SQL SUM function with GROUP BY clause.

How do you use sum in case statement?

Example 3: Using a CASE WHEN Expression With a SUM() and a GROUP BY

1. id : the ID of the order.
2. total_price : the total price of the order.
3. order_date : the date of the order.
4. status : the status of the order.
5. ship_country : the country where the order has to be shipped to.

How do you change null to zero in SQL?

The best way to convert a null to a zero is to use ISNULL( [Client Count], 0 ) or COALESCE( [Client Count], 0 ).

How do you sum in SQL?

The syntax for the SUM function in SQL is: SELECT SUM(aggregate_expression) FROM tables [WHERE conditions]; SELECT expression1, expression2, SELECT SUM(salary) AS “Total Salary” FROM employees WHERE salary > 25000; SELECT SUM(DISTINCT salary) AS “Total Salary” FROM employees WHERE salary > 25000;

How to use count in SQL?

Syntax: Overall, you can use * or ALL or DISTINCT or some expression along with COUNT to COUNT the number of rows w.r.t. By default, the function COUNT in SQL uses the ALL keyword whether you specify it or not. Therefore, If you specify the DISTINCT keyword explicitly, only unique non-null values are considered.

What is sum in SQL?

The SQL Server SUM() function is an aggregate function that calculates the sum of all or distinct values in an expression.

What is count in SQL?

COUNT() function. The SQL COUNT() function returns the number of rows in a table satisfying the criteria specified in the WHERE clause. It sets the number of rows or non NULL column values. COUNT() returns 0 if there were no matching rows.