oracleÓαê
drop table tmp_lzw_3283_tar;
create table tmp_lzw_3283_tar
(
servnumber varchar2(11)
)
;
load data
infile 'tar_3283.txt'
insert into table tmp_lzw_3283_tar
fields terminated by '|'
(
servnumber
)
/*
select count(*),count(distinct servnumber) from tmp_lzw_3283_tar;
COUNT(*) COUNT(DISTINCTSERVNUMBER)
---------- -------------------------
263 254
*/
---¹ØÁªÓû§±í
----È¡È«Æ·ÅÆÓû§Æ·ÅÆÊý¾Ý
drop table tmp_lzw_3278_tmp_tb0 purge;
create table tmp_lzw_3278_tmp_tb0 nologging as
select /*+ parallel(c,16) */ &
Ïà¹ØÎĵµ£º
Oracle ´æ´¢¹ý³Ì·µ»Ø½á¹û¼¯Óà ref cursor ʵÏÖ¡£ÊÔÑé²½ÖèÈçÏ£º
1. ½¨Á¢ ref cursor ÀàÐͺ͹ý³Ì
CREATE OR REPLACE PACKAGE types
AS
TYPE ref_cursor IS REF CURSOR;
END;
/
CREATE TABLE STOCK_PRICES(
RIC VARCHAR(6) PRIMARY KEY,
PRICE NUMBER(7,2 ......
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¿ÉǨÒƱí¿Õ¼ä
ʹÓÿÉǨÒƱí¿Õ¼ä(Transportable Tablespaces)µÄÌØÐÔÔÚÊý¾Ý¿âÖ®¼äÒƶ¯´óÁ¿Êý¾Ý£¬ÐÔÄܱÈexport/importºÍunload/loadÒª¿ìºÜ¶à£¬ÒòΪËüǨÒƱí¿Õ¼äÖ»ÐèÒª¸´ÖÆÊý¾ÝÎļþºÍ²åÈë±í¿Õ¼äÔªÊý¾Ýµ½Ä¿±êÊý¾Ý¿âÖС£
ǨÒƱí¿Õ¼ä¶ÔÒÔÏÂÓ¦ÓÃÌرðÓÐÓãº
·Ö½×¶Î½«OLTPµÄÊý¾ÝÒÆÈëÊý¾Ý²Ö¿â
¸ ......
select distinct id
from table t
where rownum < 10
order by t.id desc;
ÉÏÊöÓï¾äµÄ¹ýÂËÌõ¼þÖ´ÐÐ˳Ðò ÏÈwhere --->order by --->distinct
Èç¹ûÓÐgroup byµÄ»° group by ÔÚorder byÇ°ÃæµÄ ......
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SQL> desc test;
Name Type Nullable Default Comments
------- ------------ -------- ------- --------
COUNTRY VARCHAR2(20) Y &nb ......