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
--¶¼Ð´ÁË ²Î¿¼Ï°É
ͨ³££¬ÄãÐèÒª»ñµÃµ±Ç°ÈÕÆںͼÆËãһЩÆäËûµÄÈÕÆÚ£¬ÀýÈ磬ÄãµÄ³ÌÐò¿ÉÄÜÐèÒªÅжÏÒ»¸öÔµĵÚÒ»Ìì»òÕß×îºóÒ»Ìì¡£ÄãÃǴ󲿷ÖÈË´ó¸Å¶¼ÖªµÀÔõÑù°ÑÈÕÆÚ½øÐзָÄê¡¢Ô¡¢Èյȣ©£¬È»ºó½ö½öÓ÷ָî³öÀ´µÄÄê¡¢Ô¡¢ÈյȷÅÔÚ¼¸¸öº¯ÊýÖмÆËã³ö×Ô¼ºËùÐèÒªµÄÈÕÆÚ£¡ÔÚÕâƪÎÄÕÂÀÎÒ½«¸æËßÄãÈçºÎʹÓÃDATEADDºÍDATEDIFFº¯Êý ......
Ò»¸ö¼òµ¥µÄСʵÀý¾ÍÃ÷°×~£¡
user±í
ÔÚÕâÕűíÖн¨Á¢´¥·¢Æ÷
Create trigger tiggername
on user
for delete
as
begin ......
Oracleά»¤³£ÓÃSQLÓï¾ä»ã×Ü
ÉÏһƪ / ÏÂһƪ 2008-09-04 11:25:01
²é¿´( 1991 ) / ÆÀÂÛ( 0 ) / ÆÀ·Ö( 0 / 0 )
ÈçºÎÔ¶³ÌÅжÏOracleÊý¾Ý¿âµÄ°²×°Æ½Ì¨
select * from v$version;
²é¿´±í¿Õ¼äµÄʹÓÃÇé¿ö
select sum(bytes)/(1024*1024) as free_space,tablespace_name
from dba_free_space
group by tablespace_ ......
£¨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×Ó¾äÖаüº¬¶à¸ö±íµÄÇé¿öÏÂ,Äã±ØÐëÑ¡Ôñ¼Ç¼ÌõÊý×îÉٵıí×÷Ϊ»ù´¡±í¡£Èç¹ûÓÐ3¸öÒÔÉϵıíÁ¬½Ó²éѯ, ÄǾÍÐèÒª ......
1¡¢µÚÒ»²½£¬Ñ¡ÖÐÒªÇå³ýÈÕÖ¾µÄÊý¾Ý¿â——ÓÒ¼ü——ÊôÐÔ¡£
2¡¢µÚ¶þ²½£ºÔÚÑ¡ÏîҳѡÖГѡÏ¬»Ö¸´Ä£Ê½Ñ¡Ôñ“¼òµ¥”£¬µã»÷×îϱßÈ·¶¨°´Å¥¡£
3¡¢µÚÈý²½£¬ÔÙÑ¡ÖÐÊý¾Ý¿âÓÒ¼ü——ÈÎÎñ——ÊÕËõ——Êý¾Ý¿â¡£
4¡¢µÚËIJ½£¬µã»÷&ldq ......