create table [callrecords]
([id] [int] not null identity(1,1),
[callernumber] [nvarchar](50), --三位數字，呼叫中心員工編號（工號）
[telnum] [varchar](50),
[startdatetime] [datetime] null,
[enddatetime] [datetime] null --結束時間要大於開始時間,預設當前時間
)--主鍵約束
alter table [callrecords]
add constraint pk_callrecords primary key(id)
--檢查約束
alter table [callrecords]
add constraint ck_callrecords check(callernumber like '[0-9][0-9][0-9]')
alter table [callrecords]
add constraint ck_callrecords_enddatetime check(enddatetime > startdatetime)
--預設約束
alter table [callrecords]
add constraint df_callrecords default(getdate()) for enddatetime
insert [dbo].[callrecords] ([callernumber], [telnum], [startdatetime], [enddatetime]) values ('001', '0208888888', cast(0x00009daf00a4cb80 as datetime), cast(0x00009daf00a62e94 as datetime));
insert [dbo].[callrecords] ([callernumber], [telnum], [startdatetime], [enddatetime]) values ('001', '0208888888', cast(0x00009db000d63bc0 as datetime), cast(0x00009db000d68dc8 as datetime));
insert [dbo].[callrecords] ([callernumber], [telnum], [startdatetime], [enddatetime]) values ('001', '89898989', cast(0x00009db000e85c60 as datetime), cast(0x00009db000e92f50 as datetime));
insert [dbo].[callrecords] ([callernumber], [telnum], [startdatetime], [enddatetime]) values ('002', '98987676', cast(0x00009db2015bb7a0 as datetime), cast(0x00009db2015c4da0 as datetime));
insert [dbo].[callrecords] ([callernumber], [telnum], [startdatetime], [enddatetime]) values ('002', '02188839389', cast(0x00009da4014c9c70 as datetime), cast(0x00009da4014e0308 as datetime));
insert [dbo].[callrecords] ([callernumber], [telnum], [startdatetime], [enddatetime]) values ('001', '767676766', cast(0x00009db400daa0c0 as datetime), cast(0x00009db400dd5fe0 as datetime));
insert [dbo].[callrecords] ([callernumber], [telnum], [startdatetime], [enddatetime]) values ('003', '0227864656', cast(0x00009db200b9ab40 as datetime), cast(0x00009db200b9fc1c as datetime));
insert [dbo].[callrecords] ([callernumber], [telnum], [startdatetime], [enddatetime]) values ('003', '676765777', cast(0x00009db8014042b8 as datetime), cast(0x00009db80141804c as datetime));
insert [dbo].[callrecords] ([callernumber], [telnum], [startdatetime], [enddatetime]) values ('001', '89977653', cast(0x00009d9a00fb9898 as datetime), cast(0x00009d9a00fe6118 as datetime));
insert [dbo].[callrecords] ([callernumber], [telnum], [startdatetime], [enddatetime]) values ('004', '400400400', cast(0x00009d9a00fb9898 as datetime), cast(0x00009d9a00fe6118 as datetime));
----查詢通話時間最長的5條記錄
select top 5 datediff(second,startdatetime,enddatetime) as timelength from dbo.callrecords
order by timelength desc
----查詢以0開頭的通話總時,以秒為計算單位
select sum(datediff(second,startdatetime,enddatetime)) from dbo.callrecords where telnum like '0%'
----查詢2023年7月通話總時長最多的前兩個呼叫員的編號
select top 2 callernumber
from
dbo.callrecords
where
datediff(month,'2010-7-1',startdatetime) = 0
group by callernumber
order by sum(datediff(second,startdatetime,enddatetime)/60) desc
----查詢2023年7月撥打**次數最多的前兩個呼叫員的編號
select top 2 callernumber
from
dbo.callrecords
where
datediff(month,'2010-7-1',startdatetime) = 0
group by callernumber
order by count(*) desc
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