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oracle Function


5.µ÷Óú¯ÊýFN_ADDONE
--------------------
SQL> SET SERVEROUTPUT ON
SQL> DECLARE CNUM NUMBER;
  2  BEGIN
  3     CNUM := USER1_ADB.FN_ADDONE(3);
  4     DBMS_OUTPUT.PUT_LINE('CNUM = ' || CNUM);
  5  END;
  6  /
CNUM = 4
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6.ɾ³ýº¯ÊýFN_ADDONE
--------------------
SQL> DROP FUNCTION USER1_ADB.FN_ADDONE;


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OracleµÄUNDOTBS01.DBFÎļþÌ«´óµÄ½â¾ö°ì·¨
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alter   database   datafile   'full_path\undotbs01.dbf'   autoextend   off;
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oracle instr


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SQL> select
instr('yuechaotianyuechao','ao') position from dual;
 
  POSITION
----------
        
6
 
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oracle ·ÖÇø±íµÄ½¨Á¢·½·¨

oracle ·ÖÇø±íµÄ½¨Á¢·½·¨ 

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OracleµÄ·ÖÇø±í¿ÉÒÔ°üÀ¨¶à¸ö·ÖÇø£¬Ã¿¸ö·ÖÇø¶¼ÊÇÒ»¸ö¶ÀÁ¢µÄ¶Î£¨SEGMENT£©£¬¿ÉÒÔ´æ·Åµ½²»Í¬µÄ±í¿Õ¼äÖС£²éѯʱ¿ÉÒÔͨ¹ý²éѯ±íÀ´·ÃÎʸ÷¸ö· ......

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select ... from tablename start with Ìõ¼þ1
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connect by prior org_id = parent_id;
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