esoft_leaf

In computing, CRUD is an acronym for create, retrieve, update, and delete. It is used to refer to the basic functions of a database or persistence layer in a software system.

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...