String function
Http://www.web136.net/2004-112753-1.shtml
Arithmetic function
Http://www.web136.net/2004-112610-1.shtml
Statistical function
Http://www.web136.net/2004-112113-1.shtml
variable
http://www.web136.net/2004/12/10/20041210-104238-1.shtml
SQL language
http://www.web136.net/2004/12/10/20041210-10408-1.shtml
