题解 | SQLW17 统计商家不同会员每日访问人次及访问人数
WITH t1 AS (
SELECT a.user_id,
b.vip
FROM visit_tb a
LEFT JOIN uservip_tb b
ON a.user_id = b.user_id
),
t2 AS (
SELECT vip,
count(user_id) AS visit_nums,
count(DISTINCT user_id) AS visit_users
FROM t1
GROUP BY vip
ORDER BY visit_nums DESC
)SELECT * FROM t2;
# 这道题关键在于是否去重计数！
