摘要： 1.ASCII返回与指定的字符对应的十进制数;View Code SQL>selectascii('A')A,ascii('a')a,ascii('0')zero,ascii('')spacefromdual;AAZEROSPACE------------------------------------659748322.CHR给出整数,返回对应的字符;View Code SQL>selectchr(54740)zhao,chr(65)chr65fromdual;ZHC---赵A3.CONCAT连接两个字符串;View 阅读全文