kmall-haikong/kmall-admin/src/main/resources/mybatis/mapper/statistics/MonthlyCustomersDao.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.kmall.admin.dao.statistics.MonthlyCustomersDao">

    <select id="queryMonthlyCustomers" resultType="com.kmall.admin.entity.MonthlySalesGrowthEntity" >
		SELECT
		o.merch_sn AS merchSn,
		m.merch_name AS merchName,
		sum( o.order_price ) AS totalSales,
		sum( og.number) as totalNumber,
		count(DISTINCT o.id) as totalCustomers,
		DATE_FORMAT(o.pay_time,'%Y-%m') as yearAndMonth
		FROM
		mall_order o
		LEFT JOIN mall_merch m ON o.merch_sn = m.merch_sn
		LEFT JOIN mall_order_goods og ON o.id = og.order_id
		<where>
			DATE_FORMAT(o.pay_time,'%Y-%m')  &gt;= #{startMonth}
			and DATE_FORMAT(o.pay_time,'%Y-%m') &lt;= #{endMonth}
			<if test="merchSn != null">
				and m.merch_sn = #{merchSn}
			</if>
		</where>
		group by DATE_FORMAT(o.pay_time,'%Y-%m')

	</select>

</mapper>