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¡¡C:\>sqlplus /nolog
¡¡¡¡SQL*Plus: Release 9.2.0.1.0 - Production on ÐÇÆÚÈý 1ÔÂ 19 14:46:21 2005
¡¡¡¡Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
¡¡¡¡SQL> connect chanet/chanet@oradb;
¡¡¡¡ÒÑÁ¬½Ó¡£
¡¡¡¡SQL> CREATE TABLE IMAGE_LOB (T_ID VARCHAR2 (5) NOT NULL,T_IMAGE BLOB NOT NULL);
¡¡¡¡±íÒÑ´´½¨¡£
¡¡¡¡SQL> CREATE OR REPLACE DIRECTORY IMAGES AS 'C:\Oracle'; --ͼƬĿ¼
¡¡¡¡Ä¿Â¼ÒÑ´´½¨¡£
¡¡¡¡SQL> CREATE OR REPLACE PROCEDURE IMG_INSERT (TID VARCHAR2,FILENAME VARCHAR2) AS
¡¡¡¡ 2 F_LOB BFILE;
¡¡¡¡ 3 B_LOB BLOB;
¡¡¡¡ 4 BEGIN
¡¡¡¡ 5 INSERT INTO IMAGE_LOB (T_ID, T_IMAGE)
¡¡¡¡ 6 VALUES (TID,EMPTY_BLOB ()) RETURN T_IMAGE INTO B_LOB;
¡¡¡¡ 7 F_LOB:= BFILENAME ('IMAGES', FILENAME);
¡¡¡¡ 8 DBMS_LOB.FILEOPEN (F_LOB, DBMS_LOB.FILE_READONLY);
¡¡¡¡ 9 DBMS_LOB.LOADfromFILE (B_LOB, F_LOB, DBMS_LOB.GETLENGTH (F_LOB));
¡¡¡¡11 DBMS_LOB.FILECLOSE (F_LOB);
¡¡¡¡12 COMMIT;
¡¡¡¡13 END;
¡¡¡¡14 /
¡¡¡¡¹ý³ÌÒÑ´´½¨¡£
¡¡¡¡SQL>-- ʾÀý
¡¡¡¡SQL> EXEC IMG_INSERT('1','f_TEST.jpg');
¡¡¡¡PL/SQL ¹ý³ÌÒѳɹ¦Íê³É¡£


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Ëæ»úÑ¡ÔñÐеÄSQLÓï¾ä? ORACLE SQLSERVER ECT.

MySQL:
SELECT column from table
ORDER BY RAND()
LIMIT 1
PostgreSQL:
SELECT column from table
ORDER BY RANDOM()
LIMIT 1
Microsoft SQL Server:
SELECT TOP 1 column from table
ORDER BY NEWID()
IBM DB2
SELECT column, RAND() as IDX
from table
ORDER BY IDX FETCH FIRST 1 ROWS ONLY
Thanks Ti ......

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   1-(physical_reads/(db_block_gets+consistent_gets))
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oracle9iÁª»ú±¸·ÝµÄ¹ý³Ì
sql>alter tablespce mytp begin backup;
sql>host copy f:\oracle\oradata\myt ......
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