题解 | #判断其是否有过购买记录#
判断其是否有过购买记录
https://www.nowcoder.com/practice/5cddad8995974b0c915ab89961428ee0
用case when 解决
select customer_id,case
when latest_place_order_date is not null then 1
when latest_place_order_date is null then 0
end if_placed_order
from customers_info;
