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oracle º¯ÊýÕûÀí(Ò»)

1. ASCII: ·µ»ØÓëÖ¸¶¨µÄ×Ö·û¶ÔÓ¦µÄÊ®½øÖÆÊý;
SQL> select ascii('A') A,ascii('a') a,ascii(0) zero,ascii('') space from dual; 
   A A ZERO SPACE
   --------- --------- --------- ---------
   65 97 48 
2. CHR:¸ø³öÕûÊý,·µ»Ø¶ÔÓ¦µÄ×Ö·û;
SQL> select chr(54740) zhao,chr(65) chr65 from dual;
   ZH C
   -- -
   ÕÔ A
3. CONCAT:Á¬½ÓÁ½¸ö×Ö·û´®;
SQL> select concat('010-','88888888')||'ת23' ¸ßǬ¾ºµç»°  from dual;
   ¸ßǬ¾ºµç»°
   ----------------
   010-88888888ת23
   
4. INITCAP:·µ»Ø×Ö·û´®²¢½«×Ö·û´®µÄµÚÒ»¸ö×Öĸ±äΪ´óд;
SQL> select initcap('smith') upp from dual;
   UPP
   -----
   Smith
5.INSTR(C1,C2,I,J):ÔÚÒ»¸ö×Ö·û´®ÖÐËÑË÷Ö¸¶¨µÄ×Ö·û,·µ»Ø·¢ÏÖÖ¸¶¨µÄ×Ö·ûµÄλÖÃ;
          C1 ±»ËÑË÷µÄ×Ö·û´®
          C2 Ï£ÍûËÑË÷µÄ×Ö·û´®
          I ËÑË÷µÄ¿ªÊ¼Î»ÖÃ,ĬÈÏΪ1
          J ³öÏÖµÄλÖÃ,ĬÈÏΪ1
SQL> select instr('oracle traning','ra',1,2) instring from dual;
   INSTRING
   ---------
   9
6.LENGTH:·µ»Ø×Ö·û´®µÄ³¤¶È;
SQL> select length('smith') length from dual;
   length
   -----
   5
7.LOWER:·µ»Ø×Ö·û´®,²¢½«ËùÓеÄ×Ö·ûСд
SQL> select lower('AaBbCcDd')AaBbCcDd from dual;
   AABBCCDD
   --------
   aabbccdd
8.UPPER:·µ»Ø×Ö·û´®,²¢½«ËùÓеÄ×Ö·û´óд
SQL> select upper(AaBbCcDd) upper from dual;
   UPPER
   --------
   AABBCCDD
9.RPADºÍLPAD(Õ³Ìù×Ö·û):RPAD ÔÚÁеÄÓÒ±ßÕ³Ìù×Ö·û LPAD ÔÚÁеÄ×ó±ßÕ³Ìù×Ö·û
SQL> select lpad(rpad('gao',10,'*'


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Oracle Óï¾äÓÅ»¯30¸ö¹æÔò(ÉÏ)

1. Ñ¡ÓÃÊʺϵÄOracleÓÅ»¯Æ÷
¡¡¡¡OracleµÄÓÅ»¯Æ÷¹²ÓÐ3ÖÖ£º
¡¡¡¡a. RULE (»ùÓÚ¹æÔò)
¡¡¡¡b. COST (»ùÓڳɱ¾)
¡¡¡¡c. CHOOSE (Ñ¡ÔñÐÔ)
¡¡¡¡ÉèÖÃȱʡµÄÓÅ»¯Æ÷£¬¿ÉÒÔͨ¹ý¶Ôinit.oraÎļþÖÐOPTIMIZER_MODE²ÎÊýµÄ¸÷ÖÖÉùÃ÷£¬ÈçRULE£¬COST£¬CHOOSE£¬ALL_ROWS£¬FIRST_ROWS . Ä㵱ȻҲÔÚSQL¾ä¼¶»òÊǻỰ(session)¼¶¶ÔÆä½øÐи²¸Ç¡£ ......

110¸öoracle³£Óú¯Êý×ܽá

 1. ASCII
·µ»ØÓëÖ¸¶¨µÄ×Ö·û¶ÔÓ¦µÄÊ®½øÖÆÊý;
SQL> select ascii(A) A,ascii(a) a,ascii(0) zero,ascii( ) space from dual;
A A ZERO SPACE
--------- --------- --------- ---------
65 97 48 32

2. CHR
¸ø³öÕûÊý,·µ»Ø¶ÔÓ¦µÄ×Ö·û;
SQL> select chr(54740) zhao,chr(65) chr65 from ......

OracleÖÐDecode()º¯ÊýʹÓü¼ÇÉ


¡¡¡¡decode()º¯ÊýÊÇORACLE PL/SQLÊǹ¦ÄÜÇ¿´óµÄº¯ÊýÖ®Ò»£¬Ä¿Ç°»¹Ö»ÓÐORACLE¹«Ë¾µÄSQLÌṩÁ˴˺¯Êý£¬ÆäËûÊý¾Ý¿â³§É̵ÄSQLʵÏÖ»¹Ã»Óд˹¦ÄÜ¡£
      DECODEº¯ÊýÊÇORACLE PL/SQLÊǹ¦ÄÜÇ¿´óµÄº¯ÊýÖ®Ò»£¬Ä¿Ç°»¹Ö»ÓÐORACLE¹«Ë¾µÄSQLÌṩÁ˴˺¯Êý£¬ÆäËûÊý¾Ý¿â³§É̵ÄSQLʵÏÖ»¹Ã»Óд˹¦ÄÜ¡£DECODEÓÐÊ²Ã´Ó ......

oracle ±Ê¼Ç VIII Ö®ÊÂÎñºÍË÷Òý

 ÊÂÎñ¾ÍÊDZ»°ó¶¨ÔÚÒ»Æð×÷Ϊһ¸öÂß¼­¹¤×÷µ¥ÔªµÄSQLÓï¾ä·Ö×飬Èç¹ûÈκÎÒ»¸öÓï¾ä²Ù×÷ʧ°ÜÄÇôÕû¸ö²Ù×÷¾Í±»Ê§°Ü£¬ÒÔºó²Ù×÷¾Í»á»Ø¹öµ½²Ù×÷ǰ״̬£¬»òÕßÊÇÉÏÓиö½Úµã¡£ÎªÁËÈ·±£ÒªÃ´Ö´ÐУ¬ÒªÃ´²»Ö´ÐУ¬¾Í¿ÉÒÔʹÓÃÊÂÎñ¡£ÊÂÎñÓÐËĸöÌØÐÔ£¬·Ö±ðÊÇ£ºÔ­×ÓÐÔ£¬Ò»ÖÂÐÔ£¬¸ôÀëÐԺͳ־ÃÐÔ¡£
Ë÷Òý¾ÍÒ»ÖÖÌØÊâµÄ²éѯ±í£¬Êý¾Ý¿âµÄËÑË÷ÒýÇæ¿ ......

110¸öoracle³£Óú¯Êý×ܽá

 1. ASCII
·µ»ØÓëÖ¸¶¨µÄ×Ö·û¶ÔÓ¦µÄÊ®½øÖÆÊý;
SQL> select ascii(A) A,ascii(a) a,ascii(0) zero,ascii( ) space from dual;
A A ZERO SPACE
--------- --------- --------- ---------
65 97 48 32
2. CHR
¸ø³öÕûÊý,·µ»Ø¶ÔÓ¦µÄ×Ö·û;
SQL> select chr(54740) zhao,chr(65) chr65 from dual;
ZH ......
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