Oracle×Ö·û´®º¯Êý

 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 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 name,length(name),addr,length(addr),sal,length(to_char(sal)) from gao.nchar_tst; 
NAME LENGTH(NAME) ADDR LENGTH(ADDR) SAL LENGTH(TO_CHAR(SAL)) 
------ ------------ ---------------- ------------ --------- -------------------- 
¸ßǬ¾º 3 ±±¾©Êк£¶§Çø 6 9999.99 7
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,’*’),17,’*’)from dual; 
LPAD(