MySQL 分区间进行数据展示 实例

SELECT COUNT(CASE WHEN IFNULL(total_money,0) >=1000 THEN a.customer_id END) AS ‘>1000‘
      ,COUNT(CASE WHEN IFNULL(total_money,0) >=800 AND IFNULL(total_money,0) <1000 THEN a.customer_id END) AS ‘800~1000‘
      ,COUNT(CASE WHEN IFNULL(total_money,0) >=500 AND IFNULL(total_money,0) <800 THEN a.customer_id END) AS ‘500~800‘
      ,COUNT(CASE WHEN IFNULL(total_money,0) <500  THEN a.customer_id END) AS ‘<500‘
FROM mc_userdb.`customer_login` a
LEFT JOIN
( SELECT customer_id,SUM(order_money) AS total_money
  FROM mc_orderdb.`order_master` GROUP BY customer_id) b
ON a.`customer_id`=b.`customer_id`