在postgresql中将间隔转换为数字

我创建了一个查询，该查询汇总了各个日期时间的间隔

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;

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有没有办法将平均队列等待时间从间隔数据类型转换为数字？

您可以获得如下间隔中的秒数：

SELECT EXTRACT(epoch FROM INTERVAL '1 day 30 minutes 1.234 seconds');

┌───────────┐
│ date_part │
├───────────┤
│ 88201.234 │
└───────────┘
(1 row)

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，你可以查一下。这是什么号码？。。秒数？。。小时数？。我想将平均队列等待时间转换为整数值。我尝试按如下方式使用提取函数，从SELECT sumts_polling/COUNTS_polling FROM callcent_QUEUECALLES group by casttime_start as date as Queue_Wait_Time中选择提取秒，casttime\u start AS DATE AS DayOfMonth from callcent\u queuecalls group by casttime\u start AS DATE order by casttime\u start AS DATE DESC-----返回以下错误，***************错误************错误：子查询返回的多行用作表达式SQL状态：2100是否可以在子查询上提取？例如，我运行了以下语句，并导致错误SELECT EXTRACTsecond FROM SELECT sumts_polling/countts_polling FROM callcent_queuecalls group by casttime_start AS date AS Queue_Wait_Time，casttime_start AS DATE AS DayOfMonth from callcent_queuecalls group by casttime_start AS DATE order by casttime_start AS DATE DESC错误：用作表达式的子查询返回多行SQL状态：2100如果此子选择最多返回一行，则只能使用此子选择。您应该使用SELECT EXTRACTS SECOND FROM sumts\U polling/COUNTS\U polling FROM…非常好！这正是我想要的结果。我在metabase dashboard中使用了这个查询，它看起来很棒。谢谢你的帮助。。。干杯