Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

50¸ö³£ÓÃsqlÓï¾ä

Student(S#,Sname,Sage,Ssex) ѧÉú±í
Course(C#,Cname,T#) ¿Î³Ì±í
SC(S#,C#,score) ³É¼¨±í
Teacher(T#,Tname) ½Ìʦ±í
ÎÊÌ⣺
1¡¢²éѯ“001”¿Î³Ì±È“002”¿Î³Ì³É¼¨¸ßµÄËùÓÐѧÉúµÄѧºÅ£»
  select a.S# from (select s#,score from SC where C#='001') a,(select s#,score
  from SC where C#='002') b
  where a.score>b.score and a.s#=b.s#;
2¡¢²éѯƽ¾ù³É¼¨´óÓÚ60·ÖµÄͬѧµÄѧºÅºÍƽ¾ù³É¼¨£»
    select S#,avg(score)
    from sc
    group by S# having avg(score) >60;
3¡¢²éѯËùÓÐͬѧµÄѧºÅ¡¢ÐÕÃû¡¢Ñ¡¿ÎÊý¡¢×ܳɼ¨£»
  select Student.S#,Student.Sname,count(SC.C#),sum(score)
  from Student left Outer join SC on Student.S#=SC.S#
  group by Student.S#,Sname
4¡¢²éѯÐÕ“ÀÄÀÏʦµÄ¸öÊý£»
  select count(distinct(Tname))
  from Teacher
  where Tname like 'Àî%';
5¡¢²éѯûѧ¹ý“Ҷƽ”ÀÏʦ¿ÎµÄͬѧµÄѧºÅ¡¢ÐÕÃû£»
    select Student.S#,Student.Sname
    from Student  
    where S# not in (select distinct( SC.S#) from SC,Course,Teacher where  SC.C#=Course.C# and Teacher.T#=Course.T# and Teacher.Tname='Ҷƽ');
6¡¢²éѯѧ¹ý“001”²¢ÇÒҲѧ¹ý±àºÅ“002”¿Î³ÌµÄͬѧµÄѧºÅ¡¢ÐÕÃû£»
  select Student.S#,Student.Sname from Student,SC where Student.S#=SC.S# and SC.C#='001'and exists( Select * from SC as SC_2 where SC_2.S#=SC.S# and SC_2.C#='002');
7¡¢²éѯѧ¹ý“Ҷƽ”ÀÏʦËù½ÌµÄËùÓпεÄͬѧµÄѧºÅ¡¢ÐÕÃû£»
  select S#,Sname
  from Student
  where S# in (select S# from SC ,Course ,Teacher where SC.C#=Course.C# and Teacher.T#=Course.T# and Teacher.Tname='Ҷƽ' group by S# having count(SC.C#)=(select count(C#) from Course,Teacher  where Teacher.T#=Course.T# and Tname='Ҷƽ'));
8¡¢²éѯ¿Î³Ì±àºÅ“002”µÄ³É¼¨±È¿Î³Ì±àºÅ“001”¿Î³ÌµÍµÄËùÓÐͬѧµÄѧºÅ¡¢ÐÕÃû£»
  Select S#,Sname from (select Student.S#,Student.Snam


Ïà¹ØÎĵµ£º

SQLÁ¬½Ó·ÖÀ༰ʹÓÃ˵Ã÷

 Í¨¹ýÁ¬½ÓÔËËã·û¿ÉÒÔʵÏÖ¶à¸ö±í²éѯ¡£Á¬½ÓÊǹØÏµÊý¾Ý¿âÄ£Ð͵ÄÖ÷ÒªÌØµã£¬Ò²ÊÇËüÇø±ðÓÚÆäËüÀàÐÍ
Êý¾Ý¿â¹ÜÀíϵͳµÄÒ»¸ö±êÖ¾¡£
ÔÚ¹ØÏµÊý¾Ý¿â¹ÜÀíϵͳÖУ¬±í½¨Á¢Ê±¸÷Êý¾ÝÖ®¼äµÄ¹ØÏµ²»±ØÈ·¶¨£¬³£°ÑÒ»¸öʵÌåµÄËùÓÐÐÅÏ¢´æ·ÅÔÚ
Ò»¸ö±íÖС£µ±¼ìË÷Êý¾Ýʱ£¬Í¨¹ýÁ¬½Ó²Ù×÷²éѯ³ö´æ·ÅÔÚ¶à¸ö±íÖеIJ»Í¬ÊµÌåµÄÐÅÏ¢¡£Á¬½Ó²Ù×÷¸øÓû ......

DBA³£ÓÃsql(¶þ)

 session״̬£º
STATUS VARCHAR2(8) Status of the session:
ACTIVE - Session currently executing SQL
INACTIVE - sql¼°ÆäsessionûÓÐÊÍ·Å»òÕý³£Í˳ö......
KILLED - Session marked to be killed
CACHED - Session temporarily cached for use by Oracle*XA
SNIPED - Session inactive, waiting on the clie ......

SQLº¯ÊýSubstringÌáÈ¡²¿·Ö×Ö·û´®

¹¦ÄÜ£º·µ»Ø×Ö·û¡¢¶þ½øÖÆ¡¢Îı¾»òͼÏñ±í´ïʽµÄÒ»²¿·Ö
Óï·¨£ºSUBSTRING ( expression, start, length )
          SQL ÖÐµÄ substring º¯ÊýÊÇÓÃÀ´×¥³öÒ»¸öÀ¸Î»×ÊÁÏÖÐµÄÆäÖÐÒ»²¿·Ö¡£Õâ¸öº¯ÊýµÄÃû³ÆÔÚ²»Í¬µÄ×ÊÁÏ¿âÖв»ÍêȫһÑù£º
²ÎÊý£º
expression ×Ö·û´®¡¢¶þ½øÖÆ×Ö·û´®¡¢Î ......

OM裡±£Áô記錄備·ÝSQL

 First:
create table gobo.gobo_om_reservations_2008b as
select * from gobo_om_reservations
where to_char(CREATION_DATE,'yyyy')<'2008'
delete from gobo_om_reservations
where to_char(CREATION_DATE,'yyyy')<'2008'
commit
After 2009Year:
create table gobo.gobo_om_reservations_????b as ......

sql ¼òµ¥Óαê

 ÔÚ´æ´¢¹ý³Ì»ò´¥·¢Æ÷ÖÐʹÓà Transact-SQL ÓαêµÄµäÐ͹ý³ÌΪ£º
ÉùÃ÷ Transact-SQL ±äÁ¿°üº¬Óα귵»ØµÄÊý¾Ý¡£ÎªÃ¿¸ö½á¹û¼¯ÁÐÉùÃ÷Ò»¸ö±äÁ¿¡£ÉùÃ÷×ã¹»´óµÄ±äÁ¿À´±£´æÁзµ»ØµÄÖµ£¬²¢ÉùÃ÷±äÁ¿µÄÀàÐÍΪ¿É´ÓÁÐÊý¾ÝÀàÐÍÒþʽת»»µÃµ½µÄÊý¾ÝÀàÐÍ¡£
ʹÓà DECLARE CURSOR Óï¾ä½« Transact-SQL ÓαêÓë SELECT Óï¾äÏà¹ØÁª¡£ÁíÍ⣬D ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ