1SELECT -- Total invoices per gender
2 sums.F AS "Women", sums.M AS "Men", sums.M + sums.F AS "Total"
3FROM (
4 SELECT
5 SUM( IF(gender='M', invoice, 0) ) As 'M',
6 SUM( IF(gender='F', invoice, 0) ) As 'F'
7 FROM sales
8) AS sums;
9-- Table Sales:
10CREATE TABLE sales (
11 gender VARCHAR(1), -- 'F' or 'M'
12 invoice NUMBER
13);