Ò׽ؽØͼÈí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

SQLÖظ´¼Ç¼²éѯɾ³ý

1
¡¢²éÕÒ±íÖжàÓàµÄÖظ´¼Ç¼£¬Öظ´¼Ç¼ÊǸù¾Ýµ¥¸ö×ֶΣ¨peopleId£©À´ÅжÏ
select

*

from
people
where
peopleId
in
(
select
   peopleId  
from
   people  
group
  
by
   peopleId  
having
  
count
(peopleId)
>

1
)
2
¡¢É¾³ý±íÖжàÓàµÄÖظ´¼Ç¼£¬Öظ´¼Ç¼ÊǸù¾Ýµ¥¸ö×ֶΣ¨peopleId£©À´Åжϣ¬Ö»ÁôÓÐrowid×îСµÄ¼Ç¼
delete

from
people
where
peopleId  
in
(
select
   peopleId  
from
people  
group
  
by
   peopleId   
having
  
count
(peopleId)
>

1
)
and
rowid
not

in
(
select

min
(rowid)
from
   people  
group

by
peopleId  
having

count
(peopleId )
>
1
)
3
¡¢²éÕÒ±íÖжàÓàµÄÖظ´¼Ç¼£¨¶à¸ö×ֶΣ©
select

*

from
vitae a
where
(a.peopleId,a.seq)
in
   (
select
peopleId,seq
from
vitae
group

by
peopleId,seq  
having

count
(
*
)
>

1
)
4
¡¢É¾³ý±íÖжàÓàµÄÖظ´¼Ç¼£¨¶à¸ö×ֶΣ©£¬Ö»ÁôÓÐrowid×îСµÄ¼Ç¼
delete

from
vitae a
where
(a.peopleId,a.seq)
in
   (
select
peopleId,seq
from
vitae
group

by
peopleId,seq
having

count
(
*
)
>

1
)
and
rowid
not

in
(
select

min
(rowid)
from
vitae
group

by
peopleId,seq
having

count
(
*
)
>
1
)
5
¡¢²éÕÒ±íÖжàÓàµÄÖظ´¼Ç¼£¨¶à¸ö×ֶΣ©£¬²»°üº¬rowid×îСµÄ¼Ç¼
select

*

from
vitae a
where
(a.peopleId,a.seq)
in
   (
select
peopleId,seq
from
vitae
group

by
peopleId,seq
having

count
(
*
)
>

1
)
and
rowid
not

in
(
select

min
(rowid)
from
vitae
group

by
peopleId,seq
having

count
(
*
)
>
1
)
(¶þ)
±È·½Ëµ
ÔÚA±íÖдæÔÚÒ»¸ö×ֶΓname”£¬
¶øÇÒ²»Í¬¼Ç¼֮¼äµÄ“name”ÖµÓпÉÄ


Ïà¹ØÎĵµ£º

PL/SQLѧϰ±Ê¼ÇÎå


ÓαêÊÇ´ÓÊý¾Ý¿âÖÐÌáÈ¡³öÀ´µÄÊý¾Ý£¬ÒÔÁÙʱ±íµÄÐÎʽ´æ·ÅÔÚÄÚ´æÖУ¬ÔÚÓαêÖÐÓÐÒ»¸öÊý¾ÝÖ¸Õ룬ÔÚ³õʼ״̬ÏÂÖ¸ÏòÊ׼Ǽ£¬ ÀûÓÃfetchÓï¾äÒƶ¯¸ÃÖ¸Õ룬´Ó¶ø¶ÔÓαêÖеÄÊý¾Ý½øÐи÷ÖÖ²Ù×÷¡£
1.¶¨ÒåÓαê
cursor ÓαêÃû is selectÓï¾ä;
2.´ò¿ªÓαê
open ÓαêÃû;
3.ÌáÈ¡ÓαêÊý¾Ý
fetch ÓαêÃû into ±äÁ¿Ãû1, ±äÁ¿Ãû2, ....;
»ò ......

½«Ò»¸öSQLÊý¾Ý¿âÖÐµÄ±íµ¼Èëµ½±ðÒ»¸öÊý¾Ý¿âÖÐ

µ¼ÈëµÄÏêϸÁ÷³Ì
1¡¢Ð½¨Ò»¸öÊý¾Ý¿â
2¡¢ÔÚеÄÊý¾Ý¿âÉϵãÓÒ¼ü-¡·“ËùÓÐÈÎÎñ”-¡·“µ¼ÈëÊý¾Ý¿â”£¬µãÏÂÒ»²½
3¡¢Ê²Ã´¶¼²»Òª¸Ä£¬ÔÚÊý¾Ý¿âÖÐÑ¡ÔñÄǸö¾ÉµÄÊý¾Ý¿â£¬µãÏÂÒ»²½
4¡¢ÔÚÕâ¸ö½çÃæµÄÊý¾Ý¿âÖÐÑ¡ÔñÄãн¨µÄÊý¾Ý¿â£¬µãÏÂÒ»²½
5¡¢Ñ¡Ôñ“ÔÚSQL SERVERÊý¾Ý¿âÖ®¼ä¸´ÖƶÔÏóºÍÊý¾Ý”£¬µãÏÂÒ»²½ ......

SQL*Plus FAQ

 What is SQL*Plus and where does it come from?
SQL*Plus is a command line SQL and PL/SQL language interface and reporting tool that ships with the Oracle Database Client and Server software. It can be used interactively or driven from scripts. SQL*Plus is frequently used by DBAs and Developers ......

Sql Server »ñµÃ¸÷ÖÖÐÎʽµÄÈÕÆÚ

SQL codeDECLARE @dt datetime
SET @dt=GETDATE()
DECLARE @number int
SET @number=3
--1£®Ö¸¶¨ÈÕÆÚ¸ÃÄêµÄµÚÒ»Ìì»ò×îºóÒ»Ìì
--A. ÄêµÄµÚÒ»Ìì
SELECT CONVERT(char(5),@dt,120)+'1-1'
--B. ÄêµÄ×îºóÒ»Ìì
SELECT CONVERT(char(5),@dt,120)+'12-31'
--2£®Ö¸¶¨ÈÕÆÚËùÔÚ¼¾¶ÈµÄµÚÒ»Ìì»ò×îºóÒ»Ìì
--A. ¼¾¶ÈµÄµÚÒ»Ìì
SE ......

sql ²éѯÌõ¼þ×Ö¶ÎΪtext»òntext µÄ½â¾ö·½°¸

sql ²éѯÌõ¼þ×Ö¶ÎΪtext»òntextµÃ½â¾ö·½°¸ÒÔ¼°varchar(max)¡¢nvarchar(max)
1¡¢ÔÚMS SQL2005¼°ÒÔÉϵİ汾ÖУ¬¼ÓÈë´óÖµÊý¾ÝÀàÐÍ£¨varchar(max)¡¢nvarchar(max)¡¢varbinary(max) £©¡£´óÖµÊý¾ÝÀàÐÍ×î¶à¿ÉÒÔ´æ´¢2^30-1¸ö×Ö½ÚµÄÊý¾Ý¡£
Õ⼸¸öÊý¾ÝÀàÐÍÔÚÐÐΪÉϺͽÏСµÄÊý¾ÝÀàÐÍ varchar¡¢nvarchar ºÍ varbinary Ïàͬ¡£
΢ÈíµÄË ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØͼ | ¸ÓICP±¸09004571ºÅ