通過GROUP，HAVING，recency等查詢SQL

Question

我的'call_logs'表具有字段：id，phone_number，call_dialed_time，is_success。 （如果對電話號碼的呼叫失敗，則我們輸入記錄並稍後嘗試再次呼叫）

對於尚未成功撥打的每個電話號碼，我想獲取最近的phone_number和call_dialed_time失敗。

如何查詢？

Answer 1

試試這個。

select distinct phone_number ,call_dialed_time from call_logs where phone_number not in(
select phone_number from call_logs group by phone_number having count(is_success) >0 
) order by call_dialed_time 

Answer 2

試試這個

select t1.* from call_logs as t1 inner join 
(
select 
phone_number, max(call_dialed_time) as call_dialed_time from call_logs 
where is_success=0 
group by phone_number 
) as t2 on t1.phone_number=t2.phone_number and t1.call_dialed_time=t2.call_dialed_time