1. 我有一張表如下：
atttime(datetime) emp(nvarchar) dept(nvarchar)
2008-08-02 6:45 zhangsan a
2008-08-02 18:20 zhangsan a
2008-08-02 11:22 zhangsan a
2008-08-02 18:20 zhangsan a
2008-08-08 7:15 zhangsan a
2008-08-08 19:12 zhangsan a
2008-08-01 6:41 ww a
2008-08-01 8:41 ww a
2008-08-01 17:20 ww a
2008-08-06 7:11 ww a
2008-08-06 18:12 ww a
2008-08-04 8:13 lisi b
2.想要得到資料如下：
即得到指定dept(a)下的所有emp(zhangsan,ww)的atttime記錄，並按每個人分組顯示，求出每個人每天的最大時間和最小時間，
沒有記錄的日期用空的補全。
attdate minatttime maxatttime emp dept
2008-08-02 6:45 18:20 zhangsan a
2008-08-03 null null zhangsan a
2008-08-04 null null zhangsan a
2008-08-05 null null zhangsan a
2008-08-06 null null zhangsan a
2008-08-07 null null zhangsan a
2008-08-08 7:15 19:12 zhangsan a
2008-08-01 6:41 17:20 ww a
2008-08-02 null null ww a
2008-08-03 null null ww a
2008-08-04 null null ww a
2008-08-05 null null ww a
2008-08-06 7:11 18:12 ww a
3.答案如下：
-->
生成測試資料
: @attrecords
create
table attrecords(atttime datetime
,emp varchar
(8),dept varchar
(1))
insert
into attrecords
select
'2008-08-02 6:45'
,'zhangsan'
,'a'
union all
select
'2008-08-02 18:20'
,'zhangsan'
,'a'
union all
select
'2008-08-02 11:22'
,'zhangsan'
,'a'
union all
select
'2008-08-02 18:20'
,'zhangsan'
,'a'
union all
select
'2008-08-08 7:15'
,'zhangsan'
,'a'
union all
select
'2008-08-08 19:12'
,'zhangsan'
,'a'
union all
select
'2008-08-01 6:41'
,'ww'
,'a'
union all
select
'2008-08-01 8:41'
,'ww'
,'a'
union all
select
'2008-08-01 17:20'
,'ww'
,'a'
union all
select
'2008-08-06 7:11'
,'ww'
,'a'
union all
select
'2008-08-06 18:12'
,'ww'
,'a'
union all
select
'2008-08-04 8:13'
,'lisi'
,'b'
--sql
查詢如下:
--在實際中
.應該在資料庫中建立乙個序號表來代替
master.dbo.spt_values
gocreate
view dbo.v_test
asselect
a.emp,a.dept,
convert
(varchar
(10),a.atttime,120)
as atttime,
convert
(varchar
(10),
min(b.atttime),108)
as minatttime,
convert
(varchar
(10),
max(b.atttime),108)
as maxatttime
from
(select a.id,b.dept,b.emp,
dateadd
(day
,a.id,b.minatttime)
as atttime
from
(select number as id from master.dbo.spt_values where
type
='p'
)as a
cross
join
(select dept,emp,
min(atttime)
as minatttime,
max(atttime)
as maxatttime
from attrecords where dept =
'a'group
by dept,emp )
as b
where
dateadd
(day
,a.id,b.minatttime)
<= b.maxatttime)
as a
left
join attrecords as b
ondatediff
(day
,b.atttime,a.atttime)
= 0 and a.emp = b.emp and a.dept = b.dept
group
by a.dept,a.emp,
convert
(varchar
(10),a.atttime,120);go
select
*from dbo.v_test order
by dept,emp,atttime;
godrop
view dbo.v_test;
drop
table attrecords;
問下這個查詢如果用linqtosql直接對attrecords查詢如何才能得到我想要的資料呢？
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