Summation of results in mysql and then dividing the result by 2?

SELECT (SUM(sales_today) + SUM(sales_yesterday)) / 2 FROM table1 For more details on what you can use, see MySQL Functions and Operators.

You can add Expressions like you add fields. For easier access you should use the "AS"-keyword to give meaningful names: select sum(sales_today) as TodaysSales, sum(sales_yesterday) as YesterdaysSales, ((sum(sales_today) + sum(sales_yesterday)) / 2) as TwoDayAverage from table1.

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