Oracle/PLSQL: Convert 函数

Oracle/PLSQL, the convert function converts a string from one character set to another.
The syntax of the convert function is:
convert( string1 , char_set_to , [ char_set_from ] )
string1 is the string to be converted.
char_set_to is the character set to convert to.
char_set_from is the character set to convert from.
Character sets include:
 

US7ASCII	US 7-bit ASCII character set
WE8DEC	West European 8-bit character set
WE8HP	HP West European Laserjet 8-bit character set
F7DEC	DEC French 7-bit character set
WE8EBCDIC500	IBM West European EBCDIC Code Page 500
WE8PC850	IBM PC Code Page 850
WE8ISO8859P1	ISO 8859-1 West European 8-bit character set

Applies To:
Oracle 8i, Oracle 9i, Oracle 10g, Oracle 11g
是把一个字符串从一个字符集转为另一个字符集显示，返回varchar2