利用SQL统计时间时怎么去除周末的时间（非工作日时间）,我需要的是工作时间．

将所有周六/周日/节假日放入表二中.

if object_id('pubs..tb') is not null
drop table tb
go

create table tb(
Dept_ID varchar(10),
EmpNo varchar(10),
Start datetime,
tEnd datetime)

insert into tb(Dept_ID,EmpNo,Start,tEnd) values('A1000','C0701006','2006-10-10','2006-11-01')
insert into tb(Dept_ID,EmpNo,Start,tEnd) values('B2000','C0607003','2006-12-13','2006-12-29')
insert into tb(Dept_ID,EmpNo,Start,tEnd) values('C3000','C0501007','2007-02-02','2007-03-01')
go

if object_id('pubs..tb2') is not null
drop table tb2
go

create table tb2(
DateOfThis datetime,
EventType_FK int,
WorkingDay_Flag int)

insert into tb2(DateOfThis,EventType_FK,WorkingDay_Flag) values('2006-10-10', 85, 1)
insert into tb2(DateOfThis,EventType_FK,WorkingDay_Flag) values('2006-10-11', 85, 1)
insert into tb2(DateOfThis,EventType_FK,WorkingDay_Flag) values('2006-10-12', 85, 1)
insert into tb2(DateOfThis,EventType_FK,WorkingDay_Flag) values('2006-10-13', 85, 1)
insert into tb2(DateOfThis,EventType_FK,WorkingDay_Flag) values('2006-10-14', 82, 0)
insert into tb2(DateOfThis,EventType_FK,WorkingDay_Flag) values('2006-10-15', 82, 0)
insert into tb2(DateOfThis,EventType_FK,WorkingDay_Flag) values('2006-10-16', 85, 1)
insert into tb2(DateOfThis,EventType_FK,WorkingDay_Flag) values('2006-10-17', 85, 1)
insert into tb2(DateOfThis,EventType_FK,WorkingDay_Flag) values('2006-10-18', 85, 1)
insert into tb2(DateOfThis,EventType_FK,WorkingDay_Flag) values('2006-10-19', 85, 1)
insert into tb2(DateOfThis,EventType_FK,WorkingDay_Flag) values('2006-10-20', 85, 1)
insert into tb2(DateOfThis,EventType_FK,WorkingDay_Flag) values('2006-10-21', 82, 0)
insert into tb2(DateOfThis,EventType_FK,WorkingDay_Flag) values('2006-10-22', 82, 0)
go

select t1.* , datediff(day,t1.Start,t1.tEnd) - t2.days as days from tb t1,
(
select a.dept_id ,
sum(case when b.DateOfThis >= a.Start and b.DateOfThis <= a.tEnd and b.WorkingDay_Flag = 0 then 1 else 0 end) as days
from tb a , tb2 b
group by a.dept_id
) t2
where t1.dept_id = t2.dept_id

--datediff(day,Start,tEnd) as days from tb

drop table tb,tb2

/*
Dept_ID EmpNo Start tEnd days
---------- ---------- ------------------------------------------------------ ------------------------------------------------------ -----------
A1000 C0701006 2006-10-10 00:00:00.000 2006-11-01 00:00:00.000 18
B2000 C0607003 2006-12-13 00:00:00.000 2006-12-29 00:00:00.000 16
C3000 C0501007 2007-02-02 00:00:00.000 2007-03-01 00:00:00.000 27

（所影响的行数为 3 行）

*/