sql²éѯ»ã×Ü
-
´¦Àí±íÖØ¸´¼Ç¼(²éѯºÍɾ³ý)
/*
*****************************************************************************************************************************************************
1¡¢Num¡¢NameÏàͬµÄÖØ¸´Öµ¼Ç¼,ûÓдóС¹ØÏµÖ»±£ÁôÒ»Ìõ
2¡¢NameÏàͬ,IDÓдóС¹ØÏµÊ±,±£Áô´ó»òСÆäÖÐÒ»¸ö¼Ç¼
ÕûÀíÈË£ºÖйú·ç(Roy)
ÈÕÆÚ:2008.06.06
*****************************************************************************************************************************************************
*/
--
1¡¢ÓÃÓÚ²éÑ¯ÖØ¸´´¦Àí¼Ç¼(Èç¹ûÁÐûÓдóС¹ØÏµÊ±2000ÓÃÉú³É×ÔÔöÁкÍÁÙʱ±í´¦Àí,SQL2005ÓÃrow_numberº¯Êý´¦Àí)
--
> --> (Roy)Éú³É測試數據
if
not
object_id
(
'
Tempdb..#T
'
)
is
null
drop
table
#T
Go
Create
table
#T(
[
ID
]
int
,
[
Name
]
nvarchar
(
1
),
[
Memo
]
nvarchar
(
2
))
Insert
#T
select
1
,N
'
A
'
,N
'
A1
'
union
all
select
2
,N
'
A
'
,N
'
A2
'
union
all
select
3
,N
'
A
'
,N
'
A3
'
union
all
select
4
,N
'
B
'
,N
'
B1
'
union
all
select
5
,N
'
B
'
,N
'
B2
'
Go
--
I¡¢NameÏàͬID×îСµÄ¼Ç¼(ÍÆ¼öÓÃ1,2,3),·½·¨3ÔÚSQl05ʱ£¬Ð§ÂʸßÓÚ1¡¢2
·½·¨1:
Select
*
from
#T a
where
not
exists
(
select
1
from
#T
where
Name
=
a.Name
and
ID
<
a.ID)
·½·¨2:
select
a.
*
from
#T a
join
(
select
min
(ID)ID,Name
from
#T
group
by
Name) b
on
a.Name
=
b.Name
and
a.ID
=
b.ID
·½·¨3:
select
*
from
#T a
where
ID
=
(
select
min
(ID)
from
#T
where
Name
=
a.Name)
·½·¨4:
select
a.
*
from
#T a
join
#T b
on
a.Name
=
b.Name
and
a.ID
>=
b.ID
group
by
a.ID,a.Name,a.Memo
having
count
(
1
)
=
1
·½·¨5:
select
*
from
#T a
group
by
ID,Name,Memo
having
ID
=
(
select
min
(ID)
from
#T
where
Name
=
a.Name)
·½·¨6:
select
Ïà¹ØÎĵµ£º
Çé¿ö£ºÎÒÒÔǰ°²×°¹ýSQL Server 2000£¬Å¶£¬»¹ÓÐSQL Server 2005¡¢MySQLÄØ£¬ºóÀ´ÏµÍ³ÖØ×°ÁË£¬²»¹ýÕâЩӦÓóÌÐò¶¼ÔÚEÅÌÀ²»ÔÚϵͳÅÌÀ¾ÍÔÚ°²×°µÄʱºò³öÏÖÈçÏÂÈý¸ö´íÎó£¬ÔÚ´ËÖð¸ö½â¾ö˵Ã÷ÈçÏ£º
ÎÊÌâÒ»£º
±¨´íÐÅÏ¢£ºÒÔǰµÄij¸ö³ÌÐò°²×°ÒÑÔÚ°²×°¼ÆËã»úÉÏ´´½¨¹ÒÆðµÄÎļþ²Ù×÷¡£ÔËÐа²×°³ÌÐò֮ǰ±ØÐëÖØÐÂÆô¶¯¼ÆËã»ú¡£
½â¾ö·½ ......
private void Create_Pz(string Sourcename)
{
string OutMsg;
SqlParameter[] sortPara = { new SqlParameter("@ps_IsType", Pz ......
1.ʹÓÃManagement Studio Express£¬ÓÓWindowsÉí·ÝÑéÖ¤”µÇ¼£¬Ñ¡ÖÐSQL·þÎñÆ÷Ãû£¬ÓÒ»÷Êó±êÑ¡ÔñÊôÐÔ£¬ÔÚ·þÎñÆ÷ÊôÐÔÑ¡ÏîÒ³Ãæ£¬Ñ¡Ôñ“°²È«ÐÔ”£¬½«·þÎñÆ÷Éí·ÝÑéÖ¤ÓÉ “WindowsÉí·ÝÑéÖ¤”¸ÄΪ“SQL ServerºÍWindowsÉí·ÝÑéÖ¤”£¬µ¥»÷È·¶¨¡£
2.ʹÓÃSQL Server 2005ÍâΧӦÓÃÅäÖÃÆ÷£¬Ñ¡ ......
ÎÒÃÇÒª×öµ½²»µ«»áдSQL,»¹Òª×öµ½Ð´³öÐÔÄÜÓÅÁ¼µÄSQL,ÒÔÏÂΪ±ÊÕßѧϰ¡¢ÕªÂ¼¡¢²¢»ã×ܲ¿·Ö×ÊÁÏÓë´ó¼Ò·ÖÏí£¡
£¨1£© Ñ¡Ôñ×îÓÐЧÂʵıíÃû˳Ðò(Ö»ÔÚ»ùÓÚ¹æÔòµÄÓÅ»¯Æ÷ÖÐÓÐЧ)£º
ORACLE µÄ½âÎöÆ÷°´ÕÕ´ÓÓÒµ½×óµÄ˳Ðò´¦Àífrom×Ó¾äÖеıíÃû£¬from×Ó¾äÖÐдÔÚ×îºóµÄ±í(»ù´¡±í driving table)½«±»×îÏÈ´¦Àí£¬ÔÚfrom× ......