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 IDÊÇÖ÷½¡£¬ÊµÏÖ²åÈëÒ»¸öNAME,ID×Ô¶¯Ôö¼Ó
SQL>   create   table   t1  
      2     (  
      3         id       number,  
      4         name   varchar2(10)  
      5     )  
      6     ;  
 SQL>   create   sequence   T1ID_SEQ  
      2     minvalue   1  
      3     maxvalue   999999  
      4     start   with   1  
      5     increment   by   1  
      6     cache   20  
      7     ;
´´½¨´¥·¢Æ÷
sql> create or replace trigger tr
 before insert on table for each row
 begin
  select to_char(seq.nextval) into :new.id form dual;
 end tr;
 /


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Oracle ³£Óú¯Êý

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length/lengthb   ×Ö·ûÊý(1¸öºº×Ö1¸ö×Ö·û) / ×Ö½ÚÊý(1¸öºº×Ö2¸ö×Ö½Ú)
ltrim/rtrim/trim ɾ³ý¿Õ¸ñ
lower/upper      ´óСдת»»
select length('abc') from dual;
select substr(ename, 1, 3) from emp; ´ÓµÚÒ»¸ö×Ö·û¿ªÊ¼½Ø£¬Ò»¹²½Ø3¸ö×Ö·û
substr('abcdefg',2,3) => ......

Oracle ²éѯ¡¢¸üлù±¾²Ù×÷

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select * from books for update;
µ±Ç°Óû§¸üÐÂÖ®ºó£¬ÁíÍâÓû§¿ÉÒÔ¸ü¸Ä¡£
01¡¢±íÁ¬½Ó
¼Ù¶¨from×Ó¾äÖдÓ×óµ½ÓÒÁ½¸ö±í·Ö±ðΪA£¬B±í¡£
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select empno,ename,emp.deptno A,dept.deptno B,dname from emp ......

Oracle°²È«È«½Ó´¥£¨ÉÏ£©

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Oracle°²È«È«½Ó´¥£¨Ï£©

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ORACLE to_charº¯ÊýÏê½â

 The following are number examples for the to_char function.
to_char(1210.73, '9999.9')
would return '1210.7'
to_char(1210.73, '9,999.99')
would return '1,210.73'
to_char(1210.73, '$9,999.00')
would return '$1,210.73'
to_char(21, '000099')
would return '000021'
The following is a list ......
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