oracle函数大全
                  SQL中的单记录函数
                  1.ASCII
                  返回与指定的字符对应的十进制数;
                  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
                  给出整数,返回对应的字符;
                  SQL> select chr(54740) zhao,chr(65) chr65 from dual;
                  ZH C
                  -- -
                  赵 A
                  3.CONCAT
                  连接两个字符串;
                  SQL> select concat('010-','88888888')||'转23'  高乾竞电话 from dual;
                  高乾竞电话
                  ----------------
                  010-88888888转23
                  4.INITCAP
                  返回字符串并将字符串的第一个字母变为大写;
                  SQL> select initcap('smith') upp from dual;
                  UPP
                  -----
                  Smith
                  5.INSTR(C1,C2,I,J)
                  在一个字符串中搜索指定的字符,返回发现指定的字符的位置;
                  C1    被搜索的字符串
                  C2    希望搜索的字符串
                  I     搜索的开始位置,默认为1
                  J     出现的位置,默认为1
                  SQL> select instr('oracle traning','ra',1,2) instring from
                  dual;
                   INSTRING
                  ---------
                          9
                  6.LENGTH
                  返回字符串的长度;
                  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))
                  ------ ------------ ---------------- ------------ ---------
                  --------------------
                  高乾竞            3 北京市海锭区                6   9999.99            
                         7
                  7.LOWER
                  返回字符串,并将所有的字符小写
                  SQL> select lower('AaBbCcDd')AaBbCcDd from dual;
                  AABBCCDD
                  --------
                  aabbccdd
                  8.UPPER
                  返回字符串,并将所有的字符大写
                  SQL> select upper('AaBbCcDd') upper from dual;
                  UPPER
                  --------
                  AABBCCDD
                  9.RPAD和LPAD(粘贴字符)
                  RPAD  在列的右边粘贴字符
                  LPAD  在列的左边粘贴字符
                  SQL> select lpad(rpad('gao',10,'*'),17,'*')from dual;
                  LPAD(RPAD('GAO',1
                  -----------------
                  *******gao*******
                  不够字符则用*来填满
                  10.LTRIM和RTRIM
                  LTRIM  删除左边出现的字符串
                  RTRIM  删除右边出现的字符串
                  SQL> select ltrim(rtrim('   gao qian jing   ',' '),' ') from
                  dual;
                  LTRIM(RTRIM('
                  -------------
                  gao qian jing
                  11.SUBSTR(string,start,count)
                  取子字符串,从start开始,取count个
                  SQL> select substr('13088888888',3,8) from dual;
                  SUBSTR('
                  --------
                  08888888
                  12.REPLACE('string','s1','s2')
                  string   希望被替换的字符或变量
                  s1       被替换的字符串
                  s2       要替换的字符串
                  SQL> select replace('he love you','he','i') from dual;
                  REPLACE('H
                  ----------
                  i love you
                  13.SOUNDEX
                  返回一个与给定的字符串读音相同的字符串
                  SQL> create table table1(xm varchar(8));