我創建了總結爲各自的日期 - 時間間隔查詢,轉換間隔數PostgreSQL中
select sum(ts_polling)/count(ts_polling) as Average_Queue_Wait_Time , cast(time_start AS Date)
from callcent_queuecalls group by cast(time_start AS date) order by time_start DESC;
有沒有辦法來Average_Queue_Wait_Time從間隔數據類型轉換數字?
https://stackoverflow.com/questions/952493/how-do-i-convert-an-interval-into-a - 數量與小時後,您可以檢查這一點。 –
它是什麼數字?..秒數?..小時?.. –
我想將avergae_queue_wait_time轉換爲整數值。 我嘗試使用提取物的功能如下, 'SELECT EXTRACT(第二FROM(通過流延選擇從callcent_queuecalls組總和(ts_polling)/計數(ts_polling) (TIME_START AS日期)))AS Queue_Wait_Time, 鑄造(TIME_START AS DATE)AS DAYOFMONTH從callcent_queuecalls組由鑄鐵(TIME_START AS日期)ORDER BY CAST(TIME_START AS DATE)DESC' ---------- 返回以下錯誤, *** ********錯誤********** _ERROR:子查詢返回多於一行用作表達式 SQL狀態:2100_ – RKs